GOST 12766.3-90

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  ГОСТ 12766.3-90

GOST 12766.3−90 precision gauged Alloys of high electric resistance. Specifications (with Change No. 1)

GOST 12766.3−90

Group В32

INTERSTATE STANDARD

PRECISION GAUGED ALLOYS
WITH HIGH ELECTRICAL RESISTANCE

Specifications

Precision gauged alloys of high electric resistance. Specifications

ISS 77.080.20
GST 11 4100

Date of introduction 1991−01−01

INFORMATION DATA

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

2. APPROVED AND put INTO EFFECT by Decision of the USSR State Committee on management of quality and standards from 12.02.90 N 186

The change in N 1 taken by the Interstate Council for standardization, Metrology and certification (Protocol № 7 from 26.04.95)

The adoption voted:

The name of the state	The name of the national standardization body
The Republic Of Belarus	Belstandart
Russian Federation	Gosstandart Of Russia
Ukraine	Gosstandart Of Ukraine

3. REPLACE GOST 12766.3−77

4. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS

The designation of the reference document referenced	The number of the paragraph, subparagraph
GOST 166−89	3.2
GOST 2216−84	3.2
GOST 2419−78	3.9
GOST 3282−74	1.5.1.2
GOST 6507−90	3.2
GOST 7229−76	3.4
GOST 7417−75	1.2.2
GOST 7470−92	3.3
GOST 7565−81	3.1
GOST 7566−94	4.1, 1.5.1, 2.6, 4.1, 4.1.3
GOST 8828−89	1.5.1.2
GOST 9569−79	1.5.1.2
GOST 10354−82	1.5.1.2
GOST 10396−84	1.5.1.2
GOST 10446−80	3.7
GOST 10994−74	1.3.1
GOST 12344−2003	3.1
GOST 12345−2001	3.1
GOST 12346−78	3.1
GOST 12347−77	3.1
GOST 12348−78	3.1
GOST 12350−78	3.1
GOST 12352−81	3.1
GOST 12356−81	3.1
GOST 12357−84	3.1
GOST 12364−84	3.1
GOST 12365−84	3.1
GOST 12766.1−90	1.3.11
GOST 14253−83	1.5.1.2
GOST 15150−69	4.12
GOST 16272−79	1.5.1.2
GOST 24597−81	4.1.3
GOST 28473−90	3.1

5. Limitation of actions taken by Protocol No. 5−94 of the Interstate Council for standardization, Metrology and certification (ICS 11−12−94)

6. EDITION with Change No. 1 adopted in February 1996 (IMS 5−96)


This standard applies to round calibrated precision alloys with high electrical resistance for the manufacture of heating elements.

1. TECHNICAL REQUIREMENTS

1.1. The gauged alloys must be manufactured in accordance with the requirements of this standard.

1.1.1. Alloys are divided as follows:

usual quality — 1;

high quality — PC.

1.2. Basic parameters and dimensions

1.2.1. Calibrated alloys manufactures a diameter of 8.0−10.0 mm from alloys of H15N60-H, CR20NI80-H, KHN20JUS, KHN70JU-N, diameter 7.0−10.0 mm alloyed grades H15YU5, KH23JU5, KH23JU5T; diameter 6,0−10,0 mm alloy brand KH27JU5T.

1.2.2. Diameters and tolerances for diameter shall meet the requirements of GOST 7417, kvalitet h12.

Example of designation of alloy calibrated diameter 9 mm usual quality of the brand H15YU5:

Round 9−1-H15YU5 GOST 12766.3−90

1.3. Features

1.3.1. The chemical composition of the alloys H15YU5, KH23JU5, KH23JU5T, KH27JU5T, H15N60-H, CR20NI80-H, KHN70JU-N, KHN20JUS should correspond to GOST 10994.

1.3.2. Calibrated alloys manufactures in the soft annealed condition. By agreement with consumer it is permitted to make from the etched surface.

1.3.3. Electrical resistivity of the alloy in the soft annealed condition shall conform to the standards given in table.1.

Table 1

Grade	Electrical resistivity, μω·m
H15YU5	1,24−1,34
KH23JU5	1,30−1,40
KH23JU5T	134−1,45
KH27JU5T	1,37−1,47
H15N60-H	1,07-of 1.18
CR20NI80-H	1,07-of 1.18
KHN20JUS	0,99−1,07
KHN70JU-N	1,25−1,35

Notes:

1. Standards for grades KHN20JUS and KHN70JU-N are not rejection symptom to 01.01.97.

2. The nominal value of resistivity is given in Appendix 1.


(Changed edition, Rev. N 1).

1.3.4. The permissible deviation from the nominal value of electric resistance of 1 m must not exceed (+7)-(-3)% for alloys of higher quality and (+8)-(-4)% — for alloys of ordinary quality. The nominal electrical resistance of 1 m is given in Appendix 2.

1.3.5. The variation of electrical resistance of 1 m within a coil should not exceed 4%.

1.3.6. The persistence of the alloys tested according to the method G, must conform to the standards given in table.2.

Table 2

Grade	Temperature test, °C	Survivability*, h, not less
H15YU5	1150	120
KH23JU5	1250	80
KH23JU5T	1300	70
KH27JU5T	1300	80
H15N60-H	1150	150
CR20NI80-H	1200	160
KHN20JUS	1150	100
KHN70JU-N	1200	100

________________
* The vitality of the grades KHN70JU-N and KHN20JUS is not a rejection indication to the accumulation of statistical data. Definition of necessary.


(Changed edition, Rev. N 1).

1.3.7. (Deleted, Rev. N 1).

1.3.8. The grooved surface of the alloy must be free of cracks. Permitted defects in the form of scratches, scratches, fingerprints, sunsets, flaws with a depth not exceeding 0.15 mm. the Surface should be dark gray, gray, or covered with a thin oxide film tint.

In coordination with the consumer the quality of the surface should conform to the models agreed upon in the prescribed manner.

1.3.9. Elongation calibrated alloys in the soft annealed condition shall conform to the standards given in table.4.

Table 4*

________________
* Table.3. (Deleted, Rev. N 1).

Grade	Elongation , %, not less
H15YU5	16
KH23JU5, KH23JU5T	12
KH27JU5T	10
H15N60-H, CR20NI80-H, KHN20JUS	20
KHN70JU-N	14

1.3.10. The weight of one roll should be less than 40 kg. In parties are allowed in coils weighing not less than 10.0 kg not more than 15% of the party.

1.3.11. Correction factors for calculating changes in electrical resistance depending on the temperature and the estimated service life is given in annexes 3 and 4; physical and mechanical properties of alloys, the maximum operating temperature — in applications 4−6 GOST 12766.1.

1.4. Marking

1.4.1. Labeling — according GOST 7566.

1.5. Packaging

1.5.1. Packaging — according to GOST 7566 with additions.

1.5.1.1. Calibrated alloy must be in reels. Skein must consist of one segment,

1.5.1.2. Skeins must be wrapped in one or more layers of waterproof paper GOST 8828, 9569 GOST, GOST 10396 or other regulatory-technical documentation and in the film according to GOST 10354, GOST 16272 or other normative and technical documentation or container holstoproshivny cloth GOST of 14,253, non-woven cloth, stitched the flap of waste textile industry or other types of packaging materials according to normative-technical documentation, with the exception of packaging fabrics from natural fibers.

Packed skeins must be tied with wire according to GOST 3282 or other normative and technical documentation or some other way to protect the packs from unwinding.

The outer diameter of a coil should be no more than 1200 mm, internal — not less than 180 mm.

1.5.1.3. For protection against corrosion of the calibrated Fe-alloys on the basis of the allowed to apply tension industrial oils-20A and 40A with inhibitors.

1.5.1.4. Weight of cargo must not exceed:

80 kg — with manual loading and unloading;

1250 kg — with mechanized loading and unloading.

2. ACCEPTANCE

2.1. Calibrated alloy are accepted by the parties. The party must consist of one of the metal melt and of the same diameter and must be issued a document about quality that contains:

trademark or name, or the name and trademark of manufacturer;

designation grooved alloy;

the weight of the party;

test results*;

the chemical composition of the alloy.
________________
* Document the quality in the line «results of tests of the survivability of» record «factory guarantee».

(Changed edition, Rev. N 1).

2.2. To check the quality of alloys selected from the party:

to control chemical composition — one sample from the melt;

to control the size, surface quality and weight — 100% skeins;

to determine the electrical resistivity, the electrical resistance of 1 m, and elongation — three coils;

to control the variation of electric resistance of 1 m within a coil — single coil;

to control survivability — a single sample of weight, enough to make at least 5 m of wire diameter 0,8 mm.

2.3. Control of the variation of electrical resistance of 1 m within the same roll, the manufacturer conducts periodic, but not less than once per year.

2.4. Survivability calibrated alloy is certified according to a quality document issued by the company, izgotovlyayuschei wire, according to test results of other heats one cycle of melting.

Allowed the factory alloys calibrated to ensure survivability stability of manufacturing technology.

(Changed edition, Rev. N 1).

2.5. The chemical composition of the alloys is certified by a document of quality issued by the company, smelting the metal.

2.6. If unsatisfactory test results of at least one indicator of a re-test is carried out according to GOST 7566.

3. CONTROL METHODS

3.1. Sampling for chemical analysis is carried out according to GOST 7565.

Chemical composition of alloys determined according to GOST 12344 — 12348 GOST, GOST 12350, 12352 GOST, GOST 12356, 12357 GOST, GOST 12364, 12365 GOST, GOST 28473 or other methods providing the required accuracy of the analysis.

(Changed edition, Rev. N 1).

3.2. The diameter and shape of the grooved alloy check a caliper according to GOST 166, micrometer according to GOST 6507 or staples according to GOST 2216 in two mutually perpendicular directions of the same cross-section in at least three places.

3.3. The surface quality is checked visually. If necessary, the depth of the defect is determined by the depth gauge micrometer according to GOST 7470 or other tool, to ensure the necessary accuracy, or Stripping prior to the removal of the defect. The location of the defect cleaned with sandpaper or a file with further comparative dimension to the stripped and unstripped areas.

3.4. Electrical resistance of 1 m grooved alloy is determined according to GOST 7229 with the use of instruments of accuracy class not less than 0.05.

3.5. Mass of a coil is determined on the scale with absolute error below 1 kg.

3.6. Electrical resistivity (), μω·m, is calculated by the formula

,

where  — electrical resistance of sample, Ohms;

 — the area of cross section, m;

 — length of sample, m

3.7. Elongation is determined according to GOST 10446 on samples with an estimated length of 200 mm.

3.8. To determine the variation of electrical resistance of 1 m within a coil to measure the electric resistance of 1 m at the beginning and end of a coil, the difference between them relates to the arithmetic mean of the resulting values and multiplied by 100.

3.9. The tenacity of alloys is determined according to GOST 2419 method G to burnout.

(Changed edition, Rev. N 1).

3.10. For each type of test should be taken one sample from each selected roll.

4. TRANSPORTATION AND STORAGE

4.1. Transportation and storage — by GOST 7566 with additions.

4.1.1. Transportation of calibrated alloys should be carried out by all kinds of transport in covered vehicles or containers in accordance with cargo carriage regulations applicable to transport of this type, and conditions of loading and fastening of cargoes, approved by the Ministry of Railways of the USSR.

Allowed transportation on open rolling stock.

4.1.2. Storage conditions calibrated alloys up to 1 month. SGS according to GOST 15150, for a period of more than 1 months — 1L according to GOST 15150.

4.1.3. When transporting two or more packages to one of the consumer is consolidation packages in accordance with GOST 24597.

The uld (linkage stack) — according to GOST 7566.

5. MANUFACTURER’S WARRANTY

5.1. The manufacturer guarantees product compliance with the requirements of this standard while complying with the storage conditions.

A storage warranty period — three years from the date of manufacture for grades KHN20JUS, H15N60-H, CR20NI80-H, KHN70JU-N two years from the date of manufacture for grades H15YU5, KH23JU5, KH23JU5T, KH27JU5T.

ANNEX 1 (reference). THE NOMINAL VALUE OF THE SPECIFIC ELECTRICAL EQUIPMENT

ANNEX 1
Reference

Table 5

Grade	The nominal value of the electrical resistivity, μω·m
H15YU5	1,29
KH23JU5	1,35
KH23JU5T	1,39
KH27JU5T	1,42
H15N60-H	1,12
CR20NI80-H	1,13
KHN70JU-N	1,30
KHN20JUS	1,02

ANNEX 2 (mandatory). The NOMINAL ELECTRICAL RESISTANCE of 1 m

ANNEX 2
Mandatory

Table 6

Diameter, mm	Electrical resistance, Ω/m, for the grade of alloy
	H15YU5	KH23JU5	KH23JU5T	KH27JU5T	KHN20JUS	H15N60-H, H15N60-N-VI	CR20NI80-H, CR20NI80-H-VI	KHN70JU-N
6,0	0,0456	0,0477	0,0491	0,0502	0,0358	0,0396	0,0399	0,0459
6,1	0,0441	0,0462	0,0478	0,0486	0,0349	0,0384	0,0387	0,0445
6,3	0,0414	0,0433	0,0446	0,0455	0,0327	0,0359	0,0362	0,0417
6,5	0,0389	0,0407	0,0419	0,0428	0,0307	0,0337	0,0340	0,0392
6,7	0,0356	0,0382	0,0391	0,0402	0,0289	0,0317	0,0320	0,0368
6,9	0,0345	0,0361	0,0372	0,0380	0,0273	0,0299	0,0302	0,0348
7,0	0,0335	0,0351	0,0361	0,0369	0,0265	0,0291	0,0294	0,0338
7,1	0,0326	0,0341	0,0351	0,0359	0,0258	0,0283	0,0285	0,0328
7,3	0,0308	0,0332	0,0332	0,0339	0,0243	0,0267	0,0270	0,0310
7,5	0,0292	0,0305	0,0314	0,0321	0,0231	0,0253	0,0256	0,0294
7,8	0,0270	0,0282	0,0291	0,0297	0,0213	0,0234	0,0236	0,0272
8,0	0,0257	0,0268	0,0276	0,0282	0,0203	0,0223	0,0225	0,0258
8,2	0,0244	0,0256	0,0263	0,0269	0,0193	0,0212	To 0, 0214	0,0246
8,5	0,0227	0,0238	0,0245	0,0250	0,0180	0,0198	0,0199	0,0229
8,8	0,0212	0,0222	0,0229	0,0234	0,0168	0,0184	0,0186	To 0, 0214
9,0	0,0203	0,0212	0,0219	0,0223	0,0160	0,0176	0,0178	0,0204
9,2	0,0194	0,0203	0,0209	To 0, 0214	0,0153	0,0168	0,0170	0,0195
9,5	0,0182	0,0190	0,0196	0,0200	0,0144	0,0158	0,0159	0,0183
9,8	0,0171	0,0179	0,0184	0,0188	0,0135	0,0149	0,0150	0,0172
10,0	0,0164	0,0172	0,0177	0,0181	0,0130	0,0143	0,0144	0,0166

APPENDIX 3 (reference). CORRECTION FACTORS FOR CALCULATING CHANGES IN ELECTRICAL RESISTANCE DEPENDING ON TEMPERATURE

APPENDIX 3
Reference

Table 7

Grade	Values of correction coefficient , when the temperature of heating, °C
	20	100	200	300	400	500	600	700	800	900	1000	1100	1200	1300	1400
H15N60	1,000	1,013	1,029	1,046	1,062	1,074	1,083	-	-	-	-	-	-	-	-
H15N60-H	1,000	1,013	1,029	1,046	1,062	1,074	1,030	1,083	1,089	1,097	1,105	1,114	-	-	-
H15YU5	1,000	1,004	1,013	1,025	1,041	1,062	1,090	1,114	1,126	1,135	1,14	-	-	-	-
KH23JU5, KH23JU5T	1,000	1,002	1,007	1,013	1,022	1,036	1,056	1,063	1,067	1,072	1,076	1,079	1,080	1,083	1,086
KH27JU5T	1,000	1,002	1,005	1,010	1,015	1,025	1,030	1,033	1,035	1,040	1,040	1,041	1,043	1,045	-
CR20NI80-H	1,000	1,006	1,015	1,022	1,029	1,032	1,023	1,016	1,015	1,017	1,025	1,033	1,040	-	-
KHN70JU-N	1,000	1,004	-	-	-	1,052	1,053	1,036	1,015	1,016	1,016	1,023	1,031	-	-
KHN20JUS	1,000	1,035	1,075	1,110	1,145	1,18	1,21	Of 1.23	1,25	1,27	1,29	Of 1.31	-	-	-

Note. The electrical resistance at room temperature () was determined for each alloy after heating the sample to temperatures above 600 °C and cooling with the furnace. In this case, the electric resistance () above is regulated in this standard: for grade H15N60-H — 2%; for alloy brands CR20NI80-H — 3%; alloy grade KHN70JU-N — 5%; and below regulated in this standard: for grade H15YU5 — 2%; for grades KH23JU5, KH23JU5T and KH27JU5T — 4%.

ANNEX 4 (reference). THE ESTIMATED SERVICE LIFE OF GAUGED ALLOYS, WHEN WORKING AS A HEATER

ANNEX 4
Reference

Table 8

Grade	Diameter, mm	Temperature, °C	Service life, h, not less
KHN70JU	6.0 and more	1200	6000
CR20NI80-H		1200
H15N60-H		1125
KHN20JUS		1100
KH23JU5		1200
H15YU5		1000
KH23JU5T		1300
KH27JU5T		1300

Notes:

1. The values of life given according to all-Union scientific-research Institute of electrothermal equipment.

2. The grades KH23JU5 and H15YU5 is not recommended to use as heaters.

3. The useful life is determined in an atmosphere of air on the zig-zag samples with the height of the ridge to the iron-chrome-aluminum alloy is not more than 200 mm and for nickelchromium alloy is not more than 300 mm bending Radius at least one radius of the wire, the pitch of the ridge from 100 to 140 mm. the Samples are placed inside the chamber with thermal insulation, the heating is conducted by passing current. Specific surface load of 1.5−2.0 W/cm.