GOST 19671-91

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  ГОСТ 19671-91

GOST 19671−91 tungsten Wire for light sources. Specifications

GOST 19671−91

Group В74

INTERSTATE STANDARD

TUNGSTEN WIRE FOR LIGHT SOURCES

Specifications

Tungsten wire for light sources. Specifications

ISS 77.150.99
GST 18 5000

Date of introduction 1993−01−01

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the Ministry of metallurgy of the USSR

2. APPROVED AND promulgated by the Decree of Committee of standardization and Metrology of the USSR from 26.08.91 N 1389

3. REPLACE GOST 19671−81

4. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS

The designation of the reference document referenced	The item number, app
GOST 12.4.013−85	Annex 5
GOST 427−75	3.5; 3.11; Annex 5, 9, 10
GOST 857−95	Application 5, 10
GOST 1435−99	Annex 4
GOST 1770−74	Application 5, 6, 10
GOST 2263−79	Application 5, 10
GOST 2789−73	Annex 4
GOST 2991−85	1.5.3
GOST 3022−80	Appendix 3
GOST 3044−84	Application 5, 6
GOST 3760−79	Appendix 6
GOST 3776−78	Appendix 3
GOST 3956−76	1.5.2
GOST 4206−75	Appendix 3
GOST 4328−77	Application 3, 6
GOST 4381−87	3.1
GOST 4461−77	Appendix 6
GOST 5556−81	Application 5, 10
GOST 5632−72	Application 5, 10
GOST 5959−80	1.5.3
GOST 6507−90	3.1
GOST 6563−75	Appendix 6
GOST 6709−72	Applications 3, 5, 6, 10
GOST 7210−75	Annexes 2, 3, 4, 8, 10
GOST 7376−89	1.5.3
GOST 7933−89	1.5.1; 1.5.2
GOST 8335−96	Applications 3, 9, 10
GOST 8711−93	Annex 5
GOST 8828−89	1.5.3
GOST 9147−80	Application 5, 6
GOST 9245−79	Appendix 6
GOST 9285−78	Applications 3, 5, 10
GOST 9569−79	1.5.3
GOST 9736−91	Annex 5
GOST 10054−82	Appendix 3
GOST 10354−82	1.5.2; Annex 5
GOST 10484−78	Appendix 6
GOST 11025−78	Appendix 3
GOST 12026−76	Applications 3, 5, 6, 10
GOST 14192−96	1.4.4
GOST 14339.5−91	3.2.2
GOST 14919−83	Appendix 6
GOST 15150−69	4.2
GOST 16337−77	Appendix 6
GOST 17308−88	1.3.12
GOST 17925−72	1.4.1; 1.4.3
GOST 18242−72	2.2
GOST 18300−87	Applications 3, 5, 9, 10
GOST 18481−81	Application 5, 10
GOST 18903−73	1.2.1; Annex 3, 4, 8
GOST 19265−73	Annex 4
GOST 20010−93	Annex 5
GOST 20477−86	1.3.12
GOST 21241−89	Annexes 4, 5, 8, 10
GOST 21339−82	Annex 2
GOST 23148−98	Annex 5
GOST 24104−88	Application 5, 6
GOST 24597−81	1.5.4
GOST 25336−82	Application 5, 6, 10
GOST 25706−83	Application 5, 10
GOST 26663−85	1.5.4
GOST 28037−89	Application 2, 3, 5, 8, 9, 10
GOST 28498−90	Appendix 6
GOST 28840−90	Annex 8
GOST 29103−91	Annex 5
GOST 29298−92	Applications 3, 5, 9
GOST 29329−92	App 3, 10

5. REPRINTING. September 2004


This standard applies to tungsten pull the wire of the group A (black) stamps VA, VM, VRN, VT-7, VT-10, VT-15, manufactured by powder metallurgy and is intended for the production of light sources.

The requirements of this standard are mandatory.

1. TECHNICAL REQUIREMENTS

1.1. Tungsten wire for light sources (hereinafter, wire) must be manufactured in accordance with the requirements of this standard for technological regulations approved in the prescribed manner.

1.2. Basic parameters and dimensions

1.2.1. Assortment of wire — GOST 18903.

1.2.2. OKP codes are given in Appendix 1.

1.2.3. Designation of wire in technical documentation and while ordering must match the following pattern:

1−2-3−4-5−6 GOST 19671−91,

1 brand of wire;

2 — the accuracy of the wire;

3 — bulb type in which wire is used: LN — bulb, GZL — discharge lamp, LL — fluorescent lamps;

4 — factor of the core;

5 — the diameter of the wire;

6 — ZDH (wire intended for long-term storage).

Examples of symbols:

Wire marks BA, high precision manufacturing, intended for of helix with a core factor of 1.5, with a diameter of 26.5 microns for filament lamps:

VA-P-LN-1,5−26,5 GOST 19671−91

Wire marks BA, high precision manufacturing, intended for of helix with a core factor of 1.5, with a diameter of 26.5 microns for gas discharge bulb and designed for long-term storage:

VA-P-GZL-1,5−26,5-ZDH GOST 19671−91

1.3. Features

1.3.1. Chemical composition of wire must conform to the standards given in table.1.

Table 1

Brand of wire	Mass fraction of tungsten, %, not less	Mass fraction of oxide of thorium, %	Mass fraction of impurities, %, not more				Mass fraction of additives*, %
in total	including			aluminum	silicon
iron	calcium	molybdenum
VA	99,95	-	-	0,005	0,005	0,03	0,001−0,004	0,001−0,006
VRN	99,90	-	-	0,01	0,02	0,04	0,001−0,01	0,001−0,01
VM	99,70	0,17−0,25	0,05	-	-	-	-	-
W-7	98,96	0,70−0,99	0,05	-	-	-	-	-
VT-10	98,46	1,00−1,49	0,05	-	-	-	-	-
VT-15	97,95	1,50−2,00	0,05	-	-	-	-	-
________________ * The composition of additives includes potassium.

1.3.2. The wire must be free of burrs, delamination, cracks, kinks, and local swelling.

Wire with diameter more than 500 µm are allowed the risks and burrs, wire for outputting the limit deviation for diameter.

1.3.3. The color of the wire should be from black to gray.

On the surface of the wire with a diameter more than 500 µm are allowed a tint of color from purple to dark blue.

1.3.4. The end of the wire length from 500 to 700 mm, freely down the coil should not Sivitsa in a ring with a diameter less than shown in table.2.

Table 2

Wire diameter, µm						Ring diameter, mm
From	10,0	to	17,5	incl.	3
SV.	17,5	"	30,0	"	5
«	30,0	»	60,0	"	10
«	60,0	»	200,0	"	20

1.3.5. On the coil or the Bay must be a single piece of wire given in table.3.

Table 3

Wire diameter, µm					The cut length of wire, m, not less, for grades		Cut weight, kg, not less, for grades
VA, VRN	VM, VT-7, VT-10, VT-15	VA, VRN, VM, VT-7, VT-10, VT-15
From	10,0	to	18,0	incl.	500	-	-
SV.	18,0	"	25,0	«	500	250	-
»	25,0	"	46,0	"	400	400	-
"	46,0	"	79,0	"	300	150	-
"	79,0	"	130,0	"	250	120	-
"	130,0	"	200,0	"	100	100	-
"	200,0	"	300,0	"	100	50	-
"	300,0	"	355,0	"	30	30	-
"	355,0	"	500,0	"	30	30	0,057−0,113
"	500,0	"	700,0	"	15	15	0,057−0,113
"	700,0	"	1040,0	"	7	7	0,052−0,111
"	1040,0	"	1500,0	"	5	5	0,082−0,170

Notes:

1. The mass cut (kg), calculated by the formula

,

where is the mass of 1 m segment of wire, kg;

 — cut length of wire, m

2. Allowed by agreement between manufacturer and consumer coil, the Bay on the other a minimum cut length of wire.


The maximum segment length must not exceed 20,000 meters for wire diameter less than 50 microns.

1.3.6. Mechanical properties of wire brand VA must comply with the requirements given in table.4.

Table 4

Wire diameter, µm					Conditional tensile strength of the HS/mg/200 mm	Temporary tear resistance, N/mm(kgf/mm)
From	17,5	to	25,5	incl.	70−110	2671−4165 (270−425)
SV.	25,5	"	50,0	"	Supports 60−105	2156−4108 (220−410)
«	50,0	»	77,0	"	55−100	2058−3773 (210−385)
«	77,0	»	128,0	"	50−95	1871−3577 (191−365)
«	128,0	»	250,0	"	50−90	1871−3430 (191−350)

1.3.7. Wire brand VA intended for of helix at the core with a diameter equal to or less than two wire diameters (a factor of the core 2 and less), should not break and flake at the helix in the conditions listed in Appendix 2.

1.3.8. Wire marks BA, BM, VT-7, VT-10, VT-15, is designed for the helix on the core with a diameter of more than two wire diameters (a factor of more than 2 core), should not break and flake at the helix in the conditions listed in Appendix 2.

1.3.9. Wire brand VA with a diameter of 20 to 700 µm, for the manufacture of incandescent lamps and discharge lamps, after the secondary recrystallization should be structured similar to the model structures given in Appendix 3.

1.3.10. Wire brand VA should not have a coarse grain structure after annealing at the temperature given in table.5.

Table 5

Wire diameter, µm					Annealing temperature, °C
Nomin.	Pred. off.
From	20	to	79	incl.	1850	-50
SV.	79	"	178	"	1800	-50
«	178	»	285	"	1750	-50
«	285	»	495	"	1650	-50
«	495	»	1100	"	1600	-50
«	1100	»	1500	"	1550	-50

1.3.11. Wire brand VA with a diameter of more than 700 µm for the manufacture of the filament should be made from tungsten, which has withstood the diameter of 1250 µm creep testing. Residual elongation should not exceed 3 mm.

1.3.12. Wire diameter of less than 400 microns needs to be wound on the spool with no knots and loops. The winding should be dense and uniform over the width of the coil and to permit free spooling of wire with a rotating coil. Free Board height of the coil after winding of the wire should be not less than 2 mm. the Upper end of the wire should be tied in a loop or mounted on Board reel plastic tape with a sticky layer Pogost 20477.

Wire with a diameter of 400 microns and more needs to be wound into a coil. Each Bay must be tied up in three or four places with string to GOST 17308. Allowed the Bay to tie up any other material that does not violate the packing and does not deteriorate the quality of the wire.

Wire in coils should not Sivitsa in eight.

1.3.13. The wire should have the ability to be cleansed from the aquadag. Wire, free from the aquadag should be light gray with no traces of pollution.

1.3.14. Safety requirements during transportation, storing and working with wire doped oxide of thorium must conform to the norms of radiation safety (NRB-76/87/*), the main sanitary rules of works with radioactive substances and other radiation sources (OSP-72/87**) and safety rules for transportation of radioactive substances (PTRV-73***).
________________
* On the territory of the Russian Federation the document is not valid. Act NRB-99/2009;
** In the territory of the Russian Federation the document is not valid. Are OSPORB 99/2010;
*** On the territory of the Russian Federation the document is not valid. Are NP-053−04. — Note the manufacturer’s database.

The dose rate of radiation on the surface of the transport packages are loaded with wire doped oxide of thorium should be no more than 3 µsv/HR (0.3 mrem/h).

On the outer surface of such packages is not allowed non-fixed contamination.

1.4. Marking

1.4.1. Each coil, the Bay should have a label that indicates:

1) the name and trademark of manufacturer;

2) designation of wire;

3) the batch number;

4) for wire diameter up to 355 µm inclusive is the nominal diameter and the mass of the segment wire length of 200 mm, selected from two ends of the coil;

for a wire diameter of more than 355 mm nominal diameter;

5) nominal tensile strength for wire brand VA;

6) the length of wire on the coil or mass Bay;

7) wire brands of VM, VT-7, VT-10, VT-15 — the hazard class of the cargo 7 and the radiation hazard in accordance with GOST 17925;

8) date of manufacture;

9) the stamp of technical control.

1.4.2. To the shipping container and label where you indicate:

1) the name and trademark of manufacturer;

2) designation of the product;

3) the batch numbers;

4) the number of coils, coils;

5) total length or weight of wire;

6) date of manufacture;

7) stamp of technical control.

1.4.3. On the inner surface of the lid transport containers with wire marks VM, VT-7, VT-10, VT-15 is applied to the radiation hazard in accordance with GOST 17925.

1.4.4. Cargo marking and handling marks «Fragile. Care», «Protect from moisture» should correspond to GOST 14192.

1.5. Packaging

1.5.1. Each spool of wire put in a box made of cardboard brand or G churchyard 7933.

1.5.2. Each coil inlet wire intended for long-term storage should be Packed in bag of polyethylene film according to GOST 10354, which is nested in the silica gel according to GOST 3956. The seam should be welded. Each package with a coil put in a box made of cardboard brand or G according to GOST 7933.

1.5.3. The box with the coils, the Bay is Packed in wooden boxes type III-1 according to GOST 2991или boxes of wood-based panel type 4 according to GOST 5959, lined with double-layer wrapping paper according to GOST 8828 or paraffined paper GOST 9569, having compacted corrugated cardboard according to GOST 7376. Gross mass must not exceed 20 kg.

1.5.4. Consolidation packages in transport packets with the mechanized collection shall be conducted in accordance with the requirements of GOST 26663. Main parameters and sizes in accordance with GOST 24597.

1.5.5. Permitted by agreement with the consumer to packaging of finished products in other containers, not inferior in its characteristics to the package, is given in PP.1.5.1−1.5.3, and ensure the safety of the products.

2. ACCEPTANCE

2.1. To verify compliance with quality wire requirements of this standard carry out routine testing of each batch.

Party believe wire of the same brand, same diameter, one factor of the core, one precision manufacturing, is made from the same batch of tungsten powder is simultaneously mixed in the mixer obtained in one technological mode and simultaneously presented for inspection.

The party must be issued a document about quality that contains:

the name and trademark of manufacturer;

the nominal diameter of the wire;

the number of coils or reels and the total length of the wire;

the batch number and the batch number of the powder;

gross mass and net of the party;

the designation of this standard.

2.2. To check the wire for compliance with the requirements of paragraphs.1.2.1; 1.3.3; 1.3.5; 1.3.12; 1.4; 1.5 conduct a complete inspection with the acceptance number equal to 0.

To check the wire for compliance with the requirements of paragraphs.1.3.1; 1.3.2; 1.3.4; 1.3.6; 1.3.11; 1.3.13 conduct sampling. Sampling inspection plans for controls comply with GOST 18242* and are given in table.6.
________________
* On the territory of the Russian Federation GOST R 50779.71−99.

Table 6

Controlled parameter	Item number		Lot size, coils or reels.	The sample size of coils or reels		Acceptance number.
technical requirements	test methods	PCs	%
1. Creep	1.3.11	3.10	1−1200	2	-	0
2. Chemical composition	1.3.1	3.2	1−3	-	100	0
4−1200	3	-	0
3. Mechanical properties	1.3.6	3.7
4. The ability of cleaning off the aquadag	1.3.13	3.12
5. The lack of the bundle of wire during metallographic control	1.3.2	3.3	1−5	-	100	0
6−150	5	-	0
151−500	20	-	1
501−1200	32	-	2
6. Structure after recrystallization	1.3.9, 1.3.10	3.9
7. The diameter of the ring	1.3.4	3.5
8. No burrs, delaminations, cracks, kinks, and local swelling	1.3.2	3.3	1−3	-	100	0
4−90	3	-	0
91−280	13	-	1
281−500	20	-	1
9. Spiralshell	1.3.7, 1.3.8	3.8	501−1200	32	-	3

The type of control plan — single-stage;

view control — normal;

control level indicators 3, 4 PL.6 — S-1;

indicators table 5−9.6 — 1;

the acceptance level of defects, indicators 3, 4, 7−9 table.6 — 4%; for indicators 5, 6 table.6 — 2,5%.

2.3. Allowed the manufacturer to carry out:

1) checking chemical composition on the prefabricated (stabile). The sample size in the control — one rod billet from the party powder;

2) checking the structure of the wire made from the same batch of powder, dippredstavitelstv of wire in each band diameter: 700−620; 600−520; 500−410; 400−370; 360−285; 280−245; 240−205; 200−142; 140−122; 120−102; 100−82; 80−71; 70−51; 50−40; 39,5−30,5; 30−20 µm.

Note. Dippredstavitelstv — wire diameter of the largest volume of production of coils, coils in a controlled diameter range.

2.4. The party is rejected, if the number of defective coils or reels in the sample exceeds the acceptance number.

3. CONTROL METHODS

3.1. The wire diameter of 355 µm or less determined by the method of Annex 4.

Determination of the wire diameter from 355 to 500 microns is performed by measuring at three points of the Bay in two mutually perpendicular directions of the same cross section of wire with a micrometer Mr (0−25) mm, CL. 2 GOST 4381, over 500 µm — micrometer MK (0−25) mm, CL. 2ГОСТ 6507.

Allowed the use of other methods of measurement to ensure measurement accuracy is not lower is given in Appendix 4.

Note. In case of disagreement in determination of the wire diameter of 355 µm or less, the determination is carried out according to the method given in Annex 4.

3.2. Check the chemical composition

3.2.1. The selection and preparation of samples is carried out according to Annex 5.

3.2.2. Mass fraction of impurities and additives, in addition to the oxide of thorium (IV) determined according to GOST 14339.5.

3.2.3. Mass fraction of oxide of thorium (IV) determined by the method of Annex 6.

3.2.4. Mass fraction of tungsten is determined by the difference between the 100% and the sum of mass fractions of impurities, additives and oxide of thorium (IV).

3.3. No burrs, cracks and delamination on the wire test inspection of the upper layer wire on the coil or the Bay if you increase no more than 25for a wire diameter of from 10 to 205 µm and the increase is not more than 12.5for wire diameter from 205 to 1500 microns.

The test wire diameter and 70 µm in the absence of fibre bundles is carried out by metallographic methods according to the method of application 7. Allowed by the specified method to check the wire with a diameter of 70 to 700 microns.

Check the wire diameter is more than 300 µm in the absence of a delamination flaw detectors, eddy current-type exercise from January 1, 1995

The lack of inflection and local bulges in the wire check organoleptically pulling 1−2 m of wire through clenched fingers.

3.4. Wire color check visual inspection of the top layer of wire on the reel in the Bay.

3.5. The diameter of the ring formed freely down the coil wire, check measuring metal ruler according to GOST 427.

3.6. The cut length of wire checked in the process of winding counter space. The mass of cut wires and check using the scales for static weighing.

3.7. Mechanical properties of the wire determined according to the method of application 8.

3.8. Check wire marks BA, BM, VT-7, VT-10, VT-15 at spiralshell conducted by the method of application 2.

3.9. The test structure of wire brand VA after secondary recrystallization after annealing is carried out according to methodology of Annex 3.

3.10. Check wire brand VA creep carried out according to the method of Annex 9.

3.11. The quality of winding wire on the coil, the Bay checked visually by inspection of the top row and in the winding process. Free height check of the measuring coil with a metal ruler according to GOST 427.

3.12. Check the wire on the capability from the aquadag is carried out according to the method of application 10.

3.13. Labeling and packaging checked visually. Gross weight check by means of scales for static weighing.

4. TRANSPORTATION AND STORAGE

4.1. Transportation of the wire should be done by all kinds of transport in covered trucks in accordance with the rules of cargo transportation applicable to transportation of this species.

4.2. The wire storage in the warehouses of the manufacturer and the consumer — on storage conditions 1 according to GOST 15150.

5. MANUFACTURER’S WARRANTY

5.1. The manufacturer guarantees the conformity of the tungsten wire requirements of this standard under the conditions of transportation, storage and application.

5.2. Guaranteed storage life of wire — 12 months. from the date of manufacture. Upon expiration of the warranty period, allowed the use of wire in the production after checking for compliance with technical requirements.

5.3. Warranty period of storage of wire, made according to the agreed between customer and manufacturer specifications, or three years from the date of manufacture. Requirement optional to 01.01.96.

ANNEX 1 (mandatory). OKP CODES

ANNEX 1
Mandatory

Table 7

Product	Mark	Diameter, µm	OKP code
Wire weight	VT-15	400−510	18 5391 1027
VT-15	520−880	18 5391 1031
VT-15	900−1500	18 5391 1036
VA	400−510	18 5391 3027
VA	520−880	18 5391 3031
VA	900−1500	18 5391 3036
VRN	800−880	18 5391 5031
VRN	900−1500	18 5391 5036
VT-10	400−510	18 5391 9027
VT-10	520−880	18 5391 9031
VT-10	900−1500	18 5391 9036
W-7	400−510	18 5392 6027
W-7	520−880	18 5392 6031
W-7	900−1500	18 5392 6036
VM	400−510	18 5395 3027
VM	520−880	18 5395 3031
VM	900−1500	18 5395 3036
Wire filament	VT-15	150−180	18 5411 1026
VT-15	181−280	18 5411 1029
VT-15	281−390	18 4111 1033
VA	10−20	18 5411 3006
VA	The 20.5 and 30.5	18 5411 3009
VA	31−46	18 5411 3014
VA	47−70	18 3018 5411
VA	71−112	18 5411 3022
VA	113−180	18 5411 3026
VA	181−280	18 5411 3029
VA	281−390	18 5411 3033
VT-10	25,0−30,5	18 5411 9009
VT-10	31−46	18 5411 9014
VT-10	47−70	18 9018 5411
VT-10	71−112	18 5411 9022
VT-10	113−180	18 5411 9026
VT-10	181−280	18 5411 9029
VT-10	281−390	18 5411 9033
W-7	20	18 5412 6006
W-7	The 20.5 and 30.5	18 5412 6009
W-7	31−46	18 5412 6014
W-7	47−70	18 5412 6018
W-7	71−112	18 5412 6022
W-7	113−180	18 5412 6026
W-7	181−280	18 5412 6029
W-7	281−390	18 5412 6033
VM	15−20	18 5415 3006
VM	The 20.5 and 30.5	18 5415 3009
VM	31−46	18 5415 3014
VM	47−70	18 3018 5415
VM	71−112	18 5415 3022
VM	113−180	18 5415 3026
VM	181−280	18 5415 3029
VM	281−390	18 5415 3033

ANNEX 2 (mandatory). A METHOD OF DETERMINING SPIRITUELLE WIRE

ANNEX 2
Mandatory

1. Equipment and instrumentation

During the inspection, use:

1) spiralization machine types: B-282−03, B-282−05, B-282−06, SG-2, SG-3, SGTK-2, STAYS 3;

2) of a machine for winding wire coils on the spool type E-02602;

3) tachometer hour with a range from 50 to 1000 rpm, CL. 1,0 GOST 21339;

4) tachometer hour with a measurement range from 1,000 to 10,000 Rev/min, CL. 1, GOST 0 21339;

5) tachometer electronic 2ТЭ30 measurement limit from 100 to 30,000 rpm, maximum permissible error ±1%;

6) grammer time G, 1.0 to 1.5, CL. 4;

7) grammer time G, 10−50, CL. 4;

8) grammomys hour G 25−150. 4;

9) grammer time G, 50−300, CL. 4;

10) microscope MBS-2;

11) stop watch;

12) end cutter according to GOST 28037;

13) hand shears for cutting metal according to GOST 7210.

Note. Allowed the use of equipment and instrumentation, technical and metrological characteristics are not below standard.

2. Sampling

2.1. Cut off from each coil (coils) of wire cutters with a diameter of 100 mm, wire cutters for wire more than 100 µm segment of wire (further — the sample).

2.2. Specimen length (mm), wire with a diameter of 198 µm or less is calculated by the formula

, (1)

where the sum of the diameters of core and wire, mm;

speed of helix, rpm;

the time of helix, min.

Sample length (), mm, for wire diameter over 198 µm is calculated by the formula

, (2)

where the sum of the diameters of core and wire, mm;

 — the number of turns of 1 mm spiral;

 — the length of the wound spiral.

2.3. Samples of wire must be wound on the spool. Allowed test wire with a diameter greater than 400 microns directly from the production bays, and a wire diameter of from 251 to 400 microns directly from the production coils.

3. Preparing for the test

3.1. The test mode of the wire is determined by the table.8−10.

Table 8

Conditions of helix of the wire onto the core (a factor of 2 or less core)

Diameter Provo- Loki µm	Factor core	The speed of the spiral tion, rpm	Time spiral- tion, min.	The method of heating	Tempe temperatures of heating (in color)	Way to control the temp- temperature wire	Increase increase when you are viewing spiral	Pro- Novotna length of Navi- Wai spiral, mm	Type of spiral sational machine
From 19 to 30 incl.	2	1500	15	Indirect	The beginning of cherry	Visually — the color of the heater	70−100	-	B-282−03 SG-2СГ-3
SV. 30 to 60 incl.	1,5	Three thousand
SV. 60 to 100 incl.	2000	By passing a current through the wire	Cherry	Indirectly — by the strength of the current or the color of the wire	50	B-282−06 SGTK-2 SGTK-3 B-282−05
SV. 100 up to 200 cyl.	1
SV. 200 to 500 incl.	2	1000	-	20	100	SGTK-3

Table 9

Conditions of helix of wire on a core (a core factor more than 2)

Wire diameter, µm

Factor core

The speed of the spiral tion, rpm

Time spiral- tion, min.

The method of heating

Tempe temperatures of heating (in color)

Way to control the temp- temperature wire

Increase increase when you are viewing spiral

Pro- Novotna length navive- my spiral, mm

Type of spiral sational machine

Mark VA

From

10

to

14

incl.

2,5

1000

15

Indirect

The beginning of cherry

Visually — the color of the heater

70−100

-

B-282−03 SG-2

SV.

14

"

30

«

3000

»

30

"

60

«

3

4000

SG-3

»

60

"

198

"

Two thousand

By passing a current through the wire

Cherry

Indirectly — by the strength of the current or the color of the wire

50

B-282−05 B-282−06

"

198

"

500

"

1000

-

Light cherry

20

100

SGTK-2 SGTK-3

"

500

"

900

"

240

"

900

60

10

50

SGTK-3

Table 10

Conditions of helix on the core (the core factor more than 2)

Wire diameter, µm					Factor core	The speed of the spiral tion, rpm	Time spiral- tion, min.	The method of heating	Tempe temperatures of heating (in color)	Way to control the temp- temperature wire	Pro- Novotna length navive- my helix, mm, factor core 4	Increase increase when you are viewing spiral	Type of spiral sational machine
Mark VM
From	18,5	to	24,5	2,5	1000	15	Indirect	The beginning of cherry	Visually — the color of the heater	70−100	B-282−05
"	25	"	30	incl.	3000
SV.	30	"	Sixty	«	3	4000	Cherry	50
»	60	"	160	"	2000
"	160	"	500	"	4	60	-	Without heating	-	-	150−200	20	-
Brand VT-7, VT-10
Less than 150					4	1000	15	Indirect	The beginning of cherry	Visually	-	20	B-282−05
Brand VT-7, VT-10, VT-15
From 150 to 500					4	60	-	Without heating	-	-	150−200	20	-

Notes to the table.8−10:

1. Allowed to use other types of machines that create the conditions of helix.

2. The value of the factor of core and the speed of the helix may vary with a tolerance of ±10%.

3. The pitch of the helix is 1 to 2 wire diameters.

4. The estimated temperature of the heater when stopped the machine head.

5. Allowed control spiralshell for wire brand VA diameter from 24.5 to 70 µm to spend on the machines high speed of helix at a speed of 18,000 or more rpm and time of helix 4−5 min.

3.2. Spool samples of the wire is fixed in the head spiralization machine and coves on the reel.

3.3. The car is charged molybdenum or tungsten core of the appropriate diameter.

3.4. Spiralshell tension wire installed in accordance with table.11.

Table 11

Diameter, µm						The tension, GS (N)
To	18	6−15 (59−147)
SV.	18	to	32	incl.	16−20 (157−196)
"	32	"	41	"	30−50 (294−490)
"	41	"	52	"	60−80 (588−784)
"	52	"	60	"	80−100 (784−981)
"	60	"	66	"	100−120 (981−1350)
"	66	"	80	"	120−150 (1350−1497)
"	80	"	100	"	160−200 (1570−1960)
"	100	"	200	"	300 (2943)

Notes:

1. The tension wire with a diameter greater than 200 µm is not regulated.

2. Wire brands VT-7, VT-10 and VT-15 with a diameter from 150 to 500 µm spiralshell tension wire should be from 150 to 200 Gauss.

3.5. Carried out control and start the machine and check the tachometer speed of helix.

4. Testing and evaluation of results

4.1. The core is served with tension, which ensures its uniform movement and eliminates slippage relative to the pulling roller, a pulling and breakages.

4.2. Distance from the nichrome heater core must be from 2 to 3 mm.

4.3. Winding of the spiral should be uniform within the tolerance given in note 3 to the table.8−10 with no gaps.

4.4. Carry out inspection of spiral under the microscope. Breaks, delaminations, cracks, burrs are not allowed.

Presence of burrs on the helix, for wire diameter over 500 µm.

APPENDIX 3 (obligatory). METHOD OF DETERMINATION OF WIRE STRUCTURE

APPENDIX 3
Mandatory

The method is suitable for wires with a diameter from 20 to 700 µm.

1. Equipment, reagents, materials

When preparing samples, the identification of their structure and quality assessment structure is used:

1) the electric resistance furnace with a tungsten hydrogen muffle, ensuring a smooth rise in temperature to 2600 °C;

2) the electric resistance furnace of hydrogen that ensures a smooth rise of temperature up to 1900 °C;

3) metallographic microscope that provides magnification up to 600;

4) drying oven laboratory SNOL is 3.5.3,5.A 3.5/3M;

5) visual pyrometer with disappearing filament, measuring range from 800 °C to 3000 °C, accuracy class 2 according to GOST 8335;

6) platform scales for static weighing according to GOST 29329, the greatest weighing limit of 1 kg, maximum permissible error ±1,5where  — verification scale interval;

7) stop watch;

8) end cutter according to GOST 28037;

9) hand shears for cutting metal according to GOST 7210;

10) potassium hydroxide solid technical GOST 9285;

11) sodium hydroxide according to GOST 4328;

12) potassium genesisintermedia according to GOST 4206;

13) chromium (VI) oxide according to GOST 3776;

14) the hydrogen technical grade according to GOST 3022;

15) technical rectified ethyl alcohol according to GOST 18300;

16) distilled water according to GOST 6709;

17) GOI paste with a grain size of 4 to 7 microns;

18) sandpaper sanding waterproof paper 16-M14 GOST 10054;

19) fine wool felt for electrical equipment according to GOST 11025;

20) laboratory filter paper according to GOST 12026;

21) cloth cotton coarse calico group according to GOST 29298;

22) butakril;

23) glue BF-2;

24) tungsten wire for light sources VA at the present standard diameter of from 700 to 1500 microns, from 50 to 100 µm according to GOST 19671;

25) wool and cotton-viscose for the optical industry.

Note. Allowed the use of equipment, materials and reagents, the technical characteristics which are not below the standard.

2. Sampling

2.1. The sampling carried out at a distance from 1000 to 1500 mm from the wire end.

2.2. Cut with scissors for a wire diameter of 100 µm or less, wire cutters for wire diameter more than 100 µm from each coil (coils) cut the wire (sample). The specimen length should be not less than 300 mm for wire diameter of 20 to 100 µm and not less than 100 mm for wire diameter of 100 µm and above.

2.3. One control sample is taken from the coil (coils) of wire of any diameter, the structure of which repeatedly (at least three times) is tested and complies with the technical requirements of this standard. The recommended diameter for a control sample of 120 microns. The size of the control sample is given in claim 2.2.

3. Preparation of samples and identification of their structure

3.1. The preparation of the samples to the annealing

3.1.1. Samples with a diameter of 100 µm or less is wound on the mandrel in accordance with the devil.1. Allowed wound on a mandrel wire samples with a diameter up to 200 µm.

1 — bar, material: tungsten wire brand VA with a diameter from 700 to 1500 mm; 2 — sample

Damn.1

3.1.2. Samples with a diameter more than 100 µm tied into a bundle not less than 10 PCs For linking samples using a tungsten wire brand VA with a diameter of 50 to 100 microns.

3.1.3. Clean the surface of the samples from technological lubricant in the following order:

1) boiled in a solution of potassium hydroxide with a mass fraction of 20% or in sodium hydroxide solution with a mass fraction of 20% within 30 min;

2) washed with running hot and cold water;

3) dried in a drying Cabinet at a temperature of from 100 °C to 150 °C for 10−15 min;

4) is annealed in a hydrogen furnace, the electrical resistance at a temperature of from 1100 °C to 1150 °C for 10−15 min in hydrogen atmosphere with dew point below 10 °C.

3.2. Preparation of solutions

3.2.1. The suspension is prepared as follows: from 30 to 50 g of chromium oxide, from 30 to 50 g relatoseroticos potassium and from 4 to 10 cmof potassium hydroxide or sodium with a mass fraction of 50% was dissolved in 1000 cmof distilled water. The shelf life of the slurry to 8 h.

3.2.2. The Murakami Etchant is composed of equal amounts of potassium relatoseroticos with a mass fraction of 10% and sodium hydroxide with a mass fraction of 10%. The shelf life of the Etchant Murakami — 8 hours

Note. Allowed the use of other solutions, ensure the quality of polishing and etching.

3.3. Annealing of the samples

3.3.1. The surface of each sample, purified according to claim 3.1, before annealing, wipe with a cotton cloth soaked in alcohol.

3.3.2. The subjects and control samples annealed in a hydrogen furnace of the resistivity on the modes given in table.12. Control of annealing temperature is a pyrometer.

Table 12

Diameter, µm					The annealing conditions		Duration stages of annealing, min.			Dew point of hydrogen, °C, not more
Room	Temperature, °C	Temperature rise	Aging at a temperature of	Cooling
From	20	to	700	1	2550−2600	3	5	5	-30
From	20	to	79	incl.	2	1800−1850
SV.	79	"	178	"	1750−1800
"	178	"	285	"	1700−1750
"	285	"	495	"	1600−1650
"	495	"	700	"	1550−1600

3.4. Installation and manufacturing sections

3.4.1. Sharp taken from the middle part of each of the sample segments of the wire length 10 to 12 mm. the Number of samples should be at least 10 PCs. for wire diameter from 20 to 200 microns and at least 4 PCs. for wire diameter from 200 to 700 microns.

3.4.2. The samples are mounted in the cone (longitudinal) butakril for a wire diameter of 50 µm or more and using glue BF-2 for wire diameter less than 50 microns. Allowed the use of other materials that provide stable fixation of wire in the socket.

3.5. Method for detection of wire structure

3.5.1. Grind the sections on grinding the skins with a gradually decreasing grain size for wire diameter:

less than 50 microns M28-M14;

50−300 µm M63-M14;

300−700 µm M16-M14.

Grinding on all the skins is carried out in the same direction. Grinding on sandpaper M14 is carried out with the use of paste GOI.

3.5.2. Sections treated by the method of etching the polishing using the slurry prepared according to claim 3.2.1. Polishing is carried out on the felt. Processing sections by the method of etching the polishing is carried out until the disappearance of the ticks. Control the quality of polishing is performed under a microscope at magnification 100.

3.5.3. For the final identification of the structure of etched sections in reagent Murakami. Etching is carried out by wiping the surface of the cone with cotton wool soaked in reagent Murakami.

3.5.4. The surface of the sections are washed in running water, dried to dryness with filter paper.

3.5.5. Quality control the etching is carried out by inspection of thin section under a microscope at magnification of 100. Grain boundaries in thin sections must be clearly identified. In the case of rastravleniya grain boundaries repeat the processing sections for PP.3.5.1−3.5.4.

4. Assessment of the quality of the structure

4.1. Inspecting the structure of the control sample for PP.4.2, 4.3, 4.5. If the structure of the control specimens does not meet the technical requirements, the test is repeated on PP.3.3, 3.4, 3.5.

4.2. If the structure of the control samples meet the technical requirements, carry out inspection of the structure of the samples across the surface of the thin section under the microscope with magnification given on features.2−54, pre-wiping cone cotton cloth soaked in alcohol.

4.3. Compare the structure of the samples with the control images on the devil.2−54.

4.4. Wire, annealed by mode 2 table.12, should have a structure characteristic of the metal in the stage of primary recrystallization, the corresponding features.2−5. Wire, the structure of which corresponds to hell.6−9, is considered to be of poor quality.

4.5. Wire, annealed by mode 1 to the table.12, should have a structure characteristic of the metal in the recrystallized condition, composed of long crystals with sinuous boundaries, with small angle of inclination to the axis of the wire, and to be similar to the structure shown in hell.10−17, 25−29, 32−35, 38−42, 45−50 for all types of lamps and features.18−20 for discharge lamps.

Wire, the structure of which corresponds to hell.21−24, 30−31, 36−37, 43−44, 51−54, is considered to be of poor quality. If the structure of the wire, the corresponding features.54, found more than two sites, such wire is considered to be of poor quality.

The microstructure of wire, characteristic of metals in the stage of primary recrystallization

Relevant technical requirements

Wire diameter from 20 to 110 µm inclusive An increase of 300	Wire with a diameter of 110 to 180 µm inclusive An increase of 300
Damn.2	Damn.3

Wire with a diameter of 180 to 500 microns, inclusive Increase 200	Wire with a diameter of more than 500 to 700 µm inclusive Increase 200
Damn.4	Damn.5

The microstructure of wire, characteristic of metals in the initial stage of collective recrystallization

Does not meet technical requirements

Wire diameter from 20 to 110 µm inclusive An increase of 300	Wire with a diameter of 110 to 180 µm inclusive An increase of 300
Damn.6	Damn.7

Wire with a diameter of 180 to 500 microns, inclusive Increase 200	Wire with a diameter of more than 500 to 700 µm inclusive Increase 200
Damn.8	Damn.9

The microstructure of wire, characteristic of metals in recrystallized state

Relevant technical requirements

Wire diameter from 400 to 700 µm

Increase 170−200

Damn.10	Damn.11	Damn.12	Damn.13

Damn.14	Damn.15	Damn.16	Damn.17

Damn.18	Damn.19	Damn.20

Does not meet technical requirements

Damn.21	Damn.22	Damn.23	Damn.24

Relevant technical requirements

Wire diameter from 200 to 390 µm

Increase 200

Damn.25	Damn.26	Damn.27	Damn.28	Damn.29

Does not meet technical requirements

Damn.30	Damn.31

Relevant technical requirements

Wire diameter from 80 to 195 µm

Increase 200

Damn.32	Damn.33	Damn.34	Damn.35

Does not meet technical requirements

Damn.36	Damn.37

Relevant technical requirements

Wire diameter from 45 to 79 µm

Increase 200

Damn.38	Damn.39

Damn.40	Damn.41	Damn.42

Does not meet technical requirements

Damn.43	Damn.44

Relevant technical requirements

Wire with a diameter of from 20 to 45 µm

Increase 360−450

Damn.45	Damn.46	Damn.47

Damn.48	Damn.49	Damn.50

Does not meet technical requirements

Damn.51	Damn.52	Damn.53	Damn.54

ANNEX 4 (required). THE METHOD OF DETERMINING THE DIAMETER OF THE WIRE

ANNEX 4
Mandatory

The method is suitable for wires with a diameter of 355 µm or less.

1. Measuring instruments, accessories and tools

When performing measurements apply:

1) device for selection of the measured cut wire (Fig.55);

1 — disc template, material: steel R18 at GOST 19265, U8, U10 GOST 1435, hardness 62, the surface roughness of the working part of the pattern — not more than 0.16 µm according to GOST 2789, the thickness of the template — (2,5±0,5) mm. Disc is controlled by the template as needed, but not less than 4 times a year any tool to ensure the specified accuracy. The template should be replaced when the wear of its diameter 63,64 mm; 2 — strut; 3 — base; 4 — stand mounting device; 5 — latch

Damn.55

2) hand shears for cutting metal according to GOST 7210;

3) tweezers according to GOST 21241;

4) Libra torsion W-200, max. weight — 200 mg, the weighing error of ±0.2 mg;

5) Libra is a torsion W-1000, capacity is 1000 mg, the weighing error of ±1.0 mg;

6) microwise М150Р of the company «Sartorius», the weighing range 15/30/60/150 mg, measurement accuracy 2/5/10/20 mg.

Allowed the use of measuring devices, auxiliary devices and tools, technical and metrological characteristics are not below standard.

2. Sampling

2.1. Select at least two segments of the wire (samples), length (200±0,4) mm from both ends of each coil:

1) cut the wire end at the coil area with the excesses caused by the attachment of a wire loop;

2) wrap the wire once around the pattern fit (damn.55) holding the wire taut, preventing sagging, fix it in the clamping fixture and cut it with scissors.

3. Measurements

3.1. For weighing the sample with tweezers hung on the hook of the scales or the receiving device. The sample must not touch the walls of the housing of the balance.

3.2. Samples are weighed on scales in accordance with table.13. The value of each measurement should be within the permissible deviations of the mass, are given in appendices 2 and 2аГОСТ 18903.

Table 13

The mass of the segment wire length of 200 mm, mg						The type of scale
To	30	Microbes М150Р
SV.	30	to	200	incl.	W-200
"	200	"	355	"	W-1000

4. Processing of the results

4.1. Calculated for each coil the average value of the mass of the two samples.

4.2. For the arithmetic mean value of the weight determines the diameter of the wire in annexes 2 and 2A GOST 18903 or calculate the wire diameter (), m, by the formula

,

where is the mass of sample, mg;

 — cut length of wire, mm;

 — wire density, g/cm.

APPENDIX 5 (mandatory). SAMPLING METHOD FOR CHEMICAL ANALYSIS OF POWDER AND WIRE SHTABIKOV

ANNEX 5
Mandatory

1. Sampling

For the final verification of the chemical composition of each party is taken 300 g of powder, rod billet single or three coils of wire.

The length of the wire specimen with a diameter less than 300 microns should be 3 to 5 m, wire diameter of 300 µm or more, from 0.5 to 1.0 M.

2. Equipment, materials and reagents

When sampling for chemical analysis is used:

1) mitre saw table HC-12A with rotation frequency not more than 280 min.;

2) rectifier BCA-5A;

3) drying Cabinet SNOL is 3.5.3,5.A 3.5/3M;

4) a cathode in the form of a flat plate of stainless steel according to GOST 5632;

5) laboratory scales, maximum capacity 500 g, accuracy class 2 according to GOST 24104*;
________________
* From 1 July 2002 was put into effect GOST 24104−2001 (here and below).

6) a ruler measuring metal 1000D according to GOST 427;

7) ammeter, 0−50 A, the accuracy class 1.5 according to GOST 8711;

8) the millivoltmeter M-64, CL. 1,5 GOST 9736 thermoelectric Converter BP 300 °C — 1800 °C degrees. HA, the error according to GOST 3044*;
________________
* On the territory of the Russian Federation GOST R 8.585−2001 (here and below).

9) stop watch;

10) the hydrometer AE-1, 1100−1400 kg/m, permissible error ±10 kg/m, the division value of 10 kg/mGOST 18481;

11) the probe of the sampling of steel according to GOST 5632;

12) loupe LT-1−10GOST 25706;

13) stainless steel sheet according to GOST 5632 non-standard size with curved edges;

14) end cutter according to GOST 28037;

15) tweezers according to GOST 21241;

16) glass porcelain GOST 9147;

17) funnel glass according to GOST 25336;

18) of the measuring beaker according to GOST 1770;

19) goggles according to GOST 12.4.013*;
________________
* On the territory of the Russian Federation GOST R 12.4.013−97.

20) gloves, rubber technical GOST 20010;

21) cloth cotton coarse calico group according to GOST 29298;

22) laboratory filter paper according to GOST 12026;

23) packs custom sizes of polyethylene film according to GOST 10354;

24) medical absorbent cotton wool GOST 5556;

25) hydrochloric acid synthetic technical GOST 857;

26) the technical rectified ethyl alcohol according to GOST 18300;

27) caustic soda technical GOST 2263 or potassium hydroxide technical GOST 9285;

28) distilled water according to GOST 6709.

Allowed the use of other means of measurement with metrological characteristics of equipment and technical characteristics are not worse, and reagents not specified below.

3. Preparation of samples for sampling

3.1. Before taking samples for analysis from rod billet tool (drill), surface rod billet and sheet, which collect the chips, carefully wipe with alcohol.

3.2. When selecting wire to the analysis of the surface carefully cleaned of graphite lubricant.

3.2.1. To clean the surface of wire is used the electrolytic etching.

The electrolyte is a sodium hydroxide solution with a mass fraction of 25%. The density of the electrolyte should be from 1250 to 1360 kg/m. The temperature of the electrolyte — room.

The electrolyte after filtration is poured into a porcelain Cup. On the bottom of the glass is placed the cathode. The electrolyte volume should be ¾ Cup.

3.2.2. Samples of wire with a diameter less than 300 microns rolled up in a compact Bay, and then clamped in tweezers for the operation of etching. Wire with a diameter of 300 µm and larger are cut in pieces of length not above the level of the electrolyte in the glass.

3.2.3. Cleaning of the wire surface is carried out according to mode:

the strength of the current, And	10−13
while etching,	10−30

When installed by electrolytic etch b-030−02 is allowed to clean the wire surface by the method given in Annex 10.

3.2.4. After etching in an alkali solution samples of wire to neutralize dipped into a glass of hydrochloric acid with a mass fraction of 5%, incubated for 1 min, then thoroughly washed in running water and dried in a drying Cabinet for 10 min at a temperature of from 100 °C to 150 °C.

3.2.5. Cleanliness of the wire surface is determined visually with a magnifying glass if you increase 10. The surface of the wire should be a light gray with metallic luster.

3.2.6. In the absence of the conditions for the electrolytic etching cleaning of the surface of the wire is performed as follows: samples of wire is boiled in sodium hydroxide solution with a mass fraction of 20% for 15 min, washed in water, dried, and then annealed in an atmosphere of wet hydrogen at temperatures from 1100 °C to 1200 °C for 15 min.

4. Sampling

4.1. Sampling from the batch of powder is carried out in at least three barrels according to GOST 23148. Preparation of samples for analysis is carried out according to GOST 23148, then from the total sample taken laboratory sample weighing not less than 10 g of powder for chemical analysis.

4.2. Shavings for analysis are selected on a drill press at 4−5 points along the length of the rod billet. Swarf collected on the sheet, it is necessary to monitor the sample and the sheet does not leak the oil or cooling emulsion. Not allowed instead of sheet metal to use paper or wood.

4.2.1. The width of the capture chip should be 2 to 3 mm, thickness — not more than 0.5 mm, the feed rate of the cutter between 0.15 and 0.20 mm/min When drilling shavings must not be oxidized.

4.2.2. Sheet with shavings being shaken and of total samples are taken for laboratory sample weighing not less than 10 g for chemical analysis.

4.3. Wire after cleaning the surface, wipe with coarse calico cloth moistened in alcohol, and cut into small pieces of 3−4 mm on the metal sheet. From the three coils is cut in not less than 30 g.

4.3.1. The sample is mixed by shaking the sheet and select at least 10 g for analysis.

4.4. The sample is Packed in a plastic bag and sent to the laboratory for analysis with a cover sheet, which must include:

1) the batch number;

2) the brand of the product;

3) the name or type of analysis;

4) date of manufacture;

5) the name of the packer.

5. Safety requirements

Safety requirements — according to GOST 29103.

APPENDIX 6 (mandatory). METHOD FOR GRAVIMETRIC DETERMINATION OF OXIDE OF THORIUM (IV)

APPENDIX 6
Mandatory

The method is designed for tungsten wire brands of VM, VT-7, VT-10, VT-15.

Accuracy of the method is 0.1% for the mass concentration of thorium (IV) from 0.17% to 2.00%.

1. Equipment, reagents, materials

When determining the content of the oxide of thorium (IV) apply:

1) Cabinet dryer SNOL is 3.5.3,5.A 3.5/3M;

2) muffle furnace MP-24;

3) a hot plate EPA GOST 14919;

4) portable potentiometer PP-63. 0,05 to GOST 9245 control with thermoelectric Converter of grad. HA 0 °C — 1100 °C, accuracy according to GOST 3044;

5) liquid-in-glass thermometer, measuring range 0 °C — 360 °C; graduation is 1 °C according to GOST 28498;

6) laboratory scales, maximum weighing 200 g, accuracy class 2 according to GOST 24104;

7) a Cup made of platinum according to GOST 6563 capacity of 100 cm;

8) funnel of polyethylene according to GOST 16337 with a diameter of 70 mm;

9) glass polyethylene according to GOST 16337 with a capacity of 250 cm;

10) the flask KN-1−250−24/29 TCS GOST 25336;

11) beaker-50 GOST 1770;

12) desiccator 2−190 according to GOST 25336;

13) a glass of SV-34/12 according to GOST 25336;

14) porcelain crucible according to GOST 9147;

15) hydrofluoric acid H. h according to GOST 10484;

16) nitric acid H. h according to GOST 4461;

17) aqueous ammonia h. d. a. according to GOST 3760;

18) sodium hydroxide H. h according to GOST 4328;

19) distilled water according to GOST 6709;

20) paper filter brand FS GOST 12026.

Allowed the use of other reagents, materials and equipment, quality, class, precision and metrological characteristics are not inferior to those specified.

2. Preparation for assay

In preparation for analysis should:

1) cut the wire or shavings boiled in 100 DMof sodium hydroxide solution with a mass fraction of 20% for 15−20 min;

2) alkali drain and rinse the samples three to four times with distilled water by decantation;

3) dry the samples in a drying Cabinet at a temperature of (60±10) °C for 30 min, and then cooling to a temperature of (25±5) °C;

4) store the prepared sample in glass cups.

3. Analysis

3.1. Weighed in the balance weighed sample with an accuracy to the fourth sign. The weight of the portion, depending on the mass fraction of oxide of thorium (IV) in the alloy is determined by the table.14.

Table 14

Mass fraction of oxide of thorium (IV), %	The mass of charge, g
Of 0.17 for 0.99	2±0,0001
1.00 to 2.00	1 to±0,0001

3.2. The suspension is transferred into a platinum Cup which is poured 30 cmhydrofluoric acid, carefully added dropwise 10−15 drops of nitric acid and left at a temperature of (20±5) °C until complete dissolution of tungsten and the termination of allocation of oxides of nitrogen. Then pour in a Cup of 30 cmwater at a temperature from 70 °C to 90 °C and kept in solution for 1 h at a temperature of (20±5) °C.

3.3. Filter the solution through a double filter. The filter cake is washed three or four times with water at a temperature of from 70 °C to 90 °C.

3.4. The moist filter is transferred to a porcelain crucible, dried on a hotplate for 20 to 30 minutes and calcined in a muffle furnace at temperatures from 750 °C to 800 °C for 1.5 h. Then the crucible was placed in a desiccator, cooled to a temperature of (20±5) °C and the residue weighed in the balance with accuracy to the fourth decimal place.

3.5. At the same time spend idle experience in all stages of the analysis.

4. Processing of the results

4.1. Mass fraction of oxide of thorium (IV) (a) percentage calculated by the formula

,

where is the mass of the oxide of thorium (IV), g;

 — the mass of sludge the idle experience, g;

 — the weight of the portion,

4.2. The result of the analysis taking the arithmetic mean of results of three parallel measurements.

ANNEX 7 (obligatory). METALLOGRAPHIC METHOD FOR THE DETERMINATION OF ROSSLEA IN THE WIRE AFTER RECRYSTALLIZATION

ANNEX 7
Mandatory

The method is extended to wire for incandescent lamps.

1. Equipment, reagents, materials

Equipment, reagents, materials — sec. 1 of Annex 3.

2. Sampling

The selection of samples in accordance with PP.2.1, 2.2. of Annex 3.

3. Preparation of samples and identification of their microstructure

3.1. Preparation of samples for annealing and preparation of solutions in accordance with the PP.3.1, 3.2.of Annex 3.

3.2. The annealing of samples is carried out in accordance with clause 3.3 under the conditions given in table.15.

Table 15

Annealing temperature, °C	Duration stages of annealing, min.			Dew point of hydrogen in °C, not above
Temperature rise	Aging at a temperature of	Cooling
2550−2600	3	5	5	-30

3.3. Installation and manufacturing of thin sections is carried out in accordance with clause 3.4 of Annex 3, the number of samples should be at least 10 PCs. for wire of any diameter.

3.4. Method of revealing the microstructure of the wire in accordance with claim 3.5 of Annex 3.

4. Evaluation of wire for the presence of rosslea

4.1. Conduct the inspection of the microstructure of the wire with increase 200, a pre-wiping cone cotton cloth soaked in alcohol.

4.2. Longitudinal dark lines (such as dotted), similar to that shown in hell.56−63 relate to Rosslau. Not allowed to have rosslea more than two wires in the plane of the thin section.

The presence of the longitudinal dark lines on the ends of the cone, no longer than two diameters of wire, is not reclaim.

Valid Rosslau

Damn.56	Damn.57

Invalid Rosslau

Damn.58	Damn.59	Damn.60

Damn.61	Damn.62	Damn.63

ANNEX 8 (obligatory). METHOD OF DETERMINING MECHANICAL PROPERTIES OF WIRE

ANNEX 8
Mandatory

The method is intended for wire brand VA with a diameter from 17.5 to 250 microns.

1. Equipment, tools

For determining the mechanical properties apply:

1) explosive and versatile machine for static testing of metals with capacity from 0.1 to 500 kgs, corresponding to requirements of GOST 28840;

2) hand shears for cutting metal according to GOST 7210;

3) end cutter according to GOST 28037;

4) tweezers according to GOST 21241.

Allowed the use of equipment, tools and fixtures, technical and metrological characteristics are not below standard.

2. Sampling

2.1. The sampling carried out at a distance from 1000 to 1500 mm from the wire end.

2.2. Cut off from each coil with a pair of scissors for wire diameter of 100 µm or less, a wire cutter — wire more than 100 µm in three segment wire length of 350 to 400 mm.

3. Testing

3.1. The wire is fixed in the clamps of the machine and subjected to tension under the action of the smoothly increasing load to failure. The speed of the movable gripper — from 80 to 100 mm/min.

3.2. When testing not permitted to use part of the measurement scale, which corresponds to loadings less than 20% of the maximum.

3.3. At break of the specimen in the grips of the testing machine the test results do not take into account.

4. Processing of the results

4.1. Conditional tensile strength (), mn/mg/200 mm (g/mg/200 mm) and ultimate strength () MPa (kgf/mm), calculated by the formula:

;

;

where  — the maximum load corresponding to the moment of rupture of specimen, g;

 — the mass of the segment wire length of 200 mm to test, mg;

the cross — sectional area of wire before the rupture, mm.

The mass of the wire length of 200 mm are shown in annexes 2 and 2A GOST 18903.

4.2. If three samples the absolute difference between values is greater than 5 GS/mg/200 mm, then to repeat the test at twice the number of samples.

If repeated trials, the absolute discrepancy is greater than 5 GS/mg/200 mm, the wire is considered to be not conforming to the standard.

4.3. The notional strength of the temporary tear resistance taking the arithmetic mean of the three trials.

ANNEX 9 (required). METHOD OF CONTROLLING WIRE CREEP

ANNEX 9
Mandatory

The method is intended for wire brand VA with a diameter of more than 700 µm, for the manufacture of the filament with an operating temperature of 2500 °C. the creep Control is carried out on the wire with a diameter of 1250 microns.

1. Equipment, fixtures, instruments, materials, reagents

When the control wire is used:

1) the setup for testing creep of wire 9075-DP-0,03/3100, the heating time of sample (2600±50) °C — no more than 10 minutes;

2) visual pyrometer with disappearing filament, measuring range from 800 °C to 5000 °C, accuracy class 2 according to GOST 8335;

3) stopwatch;

4) a ruler measuring metal 1000D according to GOST 427;

5) a device for bending samples (Fig.64);

1 — the wire specimen; 2 — conductive table; 3 — clamping screw; 4 — combination pliers; 5 — a step-down transformer

Damn.64

6) a device for cutting the terminal part of the sample (Fig.65);

A device for cutting the terminal part of the samples

1 — table;

2 — motor power 300 watts; 3 cutting disc on the special bakelite base (electrocorundum white); 4 — stop; 5 — a sample of wire

Damn.65

7) end cutter according to GOST 28037;

8) cloth cotton coarse calico group according to GOST 29298;

9) technical rectified ethyl alcohol according to GOST 18300.

Allowed the use of reagents, materials and equipment, quality, technical and metrological characteristics are not inferior to those specified.

2. The selection and preparation of samples

2.1. From wire with a diameter of 1250 microns taken by the clippers at a distance of 500 mm from the end of the wire cut two lengths from 500 to 550 mm.

2.2. Prepared samples, the shape and dimensions of which are listed on the devil.66. Bend the ends of the sample is carried out in hot condition at temperature not higher than start of the visible glow at the device for features.64. The ends of the samples cut to a fixture by the devil.65.

Damn.66

2.3. The surface of the samples must be free of burrs, cracks and delamination visible to the naked eye.

2.4. Clean the surface of the samples from technological lubricant in accordance with clause 3.1.3 of Annex 3.

3. Testing and processing of results

3.1. The surface of each sample is wiped with a cotton cloth soaked in alcohol.

3.2. Fix the specimen in the mounting clips.

3.3. Sample testing is carried out at a chamber pressure of not more than 5·10mm Hg.St. (0,067 PA) and tensile stress (2,1±0,08) kgs (of 20.58±0,78) N. The tensile stress created by the load and the weight of lower mounting contact.

3.4. The sample is heated during 5−10 min to a temperature of (2600±50) °C. temperature Control is performed by the pyrometer.

3.5. After heating of the sample is fixed on the measuring range the initial position of the pointer readout on the specimen.

3.6. The sample is kept at a predetermined temperature for 4 h.

3.7. At the end of the holding fixed measuring range end position of the reference deformation of the specimen.

3.8. The absolute value of the residual elongation of the specimen is determined by the difference between final and initial readings on the measuring ruler.

3.9. After the test, the specimen is removed from the camera installation.

3.10. The tested sample is subjected to visual inspection. The sample should not have melted areas and the flattened ends. Otherwise, the test should be repeated.

3.11. To reveal the microstructure of the wire sec. 3 of Annex 3.

3.12. The wire is considered satisfactory if the value of the residual elongation of the specimen not exceeding 3 mm, and the structure of the wire by increasing from 170 to 200corresponds to hell.67, 68.

Damn.67

Damn.68

If the value of the residual elongation of at least one sample exceeds 3 mm or the structure of the wire by increasing from 170 to 200corresponds to hell.69, the wire is unsuitable for use as the filament with an operating temperature of 2500 °C.

Damn.69

APPENDIX 10 (mandatory). METHOD OF TESTING WIRE FOR THE ABILITY TO CLEAN THE SURFACE FROM THE AQUADAG

ANNEX 10
Mandatory

Cleaning wire with a diameter up to 300 µm from the aquadag is carried out by electrolytic method when rewinding it from one reel to another. Wire diameter greater than 300 microns are cleaned by the aquadag of the boiling melt of potassium hydroxide or sodium hydroxide.

1. Cleaning wire with a diameter of 300 µm

1.1. Equipment, reagents and materials

When cleaning the wire with a diameter of 300 µm is used:

1) the installation of electrolytic etching B-030−02;

2) densimeter AON-1, the measurement range from 700 to 1840 kg/m; allowable error of 1 kg/mGOST 18481;

3) platform scales for static weighing, maximum capacity 10 kg, maximum permissible error of ±1 , where the value of verification scale according to GOST 29329;

4) visual pyrometer with disappearing filament, measuring range 800 °C — 3000 °C, accuracy class 2 according to GOST 8335;

5) a ruler measuring metal 300 according to GOST 427;

6) counter of metric area SD-35;

7) Lupu LP-1−10GOST 25706;

8) scissors for cutting metal according to GOST 7210;

9) funnel-100−150ХС according to GOST 25336;

10) beaker 250 GOST 1770;

11) potassium hydroxide technical GOST 9285 or caustic soda technical GOST 2263;

12) hydrochloric acid synthetic technical GOST 857, a solution with a mass fraction of 3% to 5%;

13) technical rectified ethyl alcohol according to GOST 18300;

14) distilled water according to GOST 6709;

15) the filter paper brands f according to GOST 12026;

16) medical absorbent cotton wool GOST 5556.

Allowed the use of other reagents, materials and equipment, quality, class, precision and metrological characteristics are not inferior to those specified.

1.2. Sampling

From each coil cut with scissors cut the wire length given in table.16. The cut length of wire measure counter meter.

Table 16

Wire diameter, µm	The cut length of wire, m, not less
Up to 100 incl.	100
SV. 100 to 300	20

1.3. Testing

1.3.1. Prepare a solution of potassium hydroxide or sodium hydroxide at the rate of 250 to 300 grams of caustic in 1 DMof the solution, it is cooled to a temperature of (20±5) °C and filtered through cotton wool or filter paper. The density of the solution should be from 1.25 to 1.35 g/cm.

1.3.2. Pour the electrolyte solution into the tank installation B-030−02. To install run cut the wire and etching is carried out according to the mode shown in table.17, and in accordance with the normative-technical documentation for the installation.

Table 17

Wire diameter, µm					Reducing the diameter of the wire after cleaning, %, by mass, cut length 200 mm	The strength of the current, And	The rate of passage of the wire through the electrolyte, m/min
From	20,0	to	30,0	incl.	1,5−3,0	1.0 to 1.5	40
SV.	30,0	"	40,0	"	1,5−2,5	40
"	40,0	"	50,0	"	2,5−4,0	40
"	50,0	"	60,0	"	4,0−6,0	40
"	60,0	"	70,0	"	6,0−8,0	40
"	70,0	"	80,0	"	8,0−10,0	40
"	80,0	"	90,0	"	10,0−12,0	40
"	90,0	"	100,0	"	12,0−14,0	20
"	100,0	"	125,0	"	14,0−16,0	20
"	125,0	"	150,0	"	16,0−18,0	20
"	150,0	"	175,0	"	18,0−20,0	20
"	175,0	"	200,0	"	1,0−2,5	20,0−22,0	20
"	200,0	"	225,0	"	22,0−24,0	15
"	225,0	"	250,0	"	24,0−26,0	15
"	250,0	"	275,0	"	26,0−28,0	10
"	275,0	"	300,0	"	28,0−30,0	10
Note. The deviation of the speed of passage of the wire through the electrolyte in the range of ±10%.

1.3.3. In the absence of the installation of the electrolytic etching is carried out the following test for cleanability.

Samples of wire with a diameter less than 200 microns is boiled in an alkali solution with a mass fraction of 20% for 15 min, thoroughly washed with water, dried and annealed in the atmosphere of wet hydrogen with a dew point of 10 °C to 20 °C at a temperature of 1100 °C — 1200 °C.

Samples of wire with a diameter of 200 microns and above is annealed in an atmosphere of wet hydrogen with a dew point of 10 °C to 20 °C at a temperature of 1100 °C — 1200 °C.

2. Cleaning wire with a diameter of 300 to 1500 µm

2.1. Equipment, reagents

When cleaning the wire with a diameter of 300 to 1500 µm are used:

1) fume hood 2 SNG size 1090х2800 mm;

2) the bath of steel 30ch13 according to GOST 5632 size 300х250х350 mm;

3) Lupu LP-1−10GOST 25706;

4) end cutter according to GOST 28037;

5) tweezers according to GOST 21241;

6) potassium hydroxide technical GOST 9285 or caustic soda technical GOST 2263.

2.2. Sampling

2.2.1. The cut length of wire, cut with wire cutters from the coil or bays, are shown in table.18.

Table 18

Wire diameter, µm						The cut length of wire, m, not less
SV.	300	to	500	incl.	2
"	500	"	1500	"	1

2.2.2. The piece of wire is cut into samples with a length of 150 to 200 mm.

2.3. Testing

2.3.1. A bath filled with potassium hydroxide or sodium hydroxide, is placed over a gas burner, installed in a fume hood.

2.3.2. Ignite the gas burner and heats the lye to a boil.

2.3.3. Samples of wire is dipped into a bath of boiling lye and etching is carried out for 10−15 min.

2.3.4. Etched samples using tweezers, remove from the bath, washed with water and dried.

3. Processing of the results

Conduct the inspection of wire under a magnifying glass LP-1−10. The treated wire should be of light gray color without a trace of pollution.