GOST 12766.2-90

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  ГОСТ 12766.2-90

GOST 12766.2−90 Tape of precision alloys with high electrical resistance. Specifications (with Change No. 1)

GOST 12766.2−90

Group B34

INTERSTATE STANDARD

TAPE OF PRECISION ALLOYS WITH HIGH ELECTRICAL RESISTANCE

Specifications

Strip of high electric resistance precision alloys. Specifications

ISS 77.140.50
OKP 12 3500, 12 3600

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 13.02.90 N 197

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 authority for standardization
The Republic Of Belarus	Belstandart
Russian Federation	Gosstandart Of Russia
Ukraine	Gosstandart Of Ukraine

3. REPLACE GOST 12766.2−77

4. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS

The designation of the reference document referenced	The number of the paragraph, subparagraph, enumeration
GOST 166−89	3.2
GOST 2419−78	3.8
GOST 2991−85	1.5.1.2
GOST 3282−74	1.5.1.3, 1.5.1.4
GOST 3560−73	1.5.1.3, 1.5.1.4
GOST 4381−87	3.2
GOST 6009−74	1.5.1.3, 1.5.1.4
GOST 6507−90	3.2
GOST 7229−76	3.4
GOST 7565−81	3.1
GOST 7566−94	1.4.1, 1.5.1, 2.6; 4.1
GOST 8828−89	1.5.1.2, 1.5.1.3
GOST 9078−84	1.5.1.5
GOST 9569−79	1.5.1.2, 1.5.1.3
GOST 9570−84	1.5.1.5
GOST 10354−82	1.5.1.3
GOST 10396−84	1.5.1.2, 1.5.1.3, 1.5.1.4
GOST 10994−74	1.3.1
GOST 11701−84	3.11
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	1.3.12
GOST 14019−2003	3.10
GOST 14192−96	1.4.2
GOST 20799−88	1.5.1.6
GOST 21650−76	4.1.2
GOST 24597−81	4.1.2
GOST 26877−91	3.3
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 cold rolled strip of precision alloys with high electrical resistance for the manufacture of heating elements and resistance elements.

1. TECHNICAL REQUIREMENTS

1.1. The tape shall be manufactured in accordance with the requirements of this standard.

1.1.1. The tape is divided:

the assignment of grades H15YU5, KH23JU5, KH23JU5T, KH27JU5T, KHN20JUS;

for heating elements — N;

resistance elements,

for normalized values:

without standardization of mechanical properties of BM;

with standard mechanical properties — M;

the permitted deviation of the electrical resistance up to 1 meter of tape:

usual quality — 1;

high quality — PC.

1.2. Basic parameters and dimensions

1.2.1. Tape depending on the brand of alloy manufactured by size limit given in table.1.

Table 1

Grade	Thickness, mm	Width, mm
H15YU5 KH23JU5 KH23JU5T KH27JU5T	0,2−3,2	6−80
H15N60 H15N60-H CR20NI80-H	0,1−3,2	6−250
Х20ЮС*	0,1−3,2	6−80

1.2.2. Tape are made with cut edge width 6; 8; 10; 12; 14; 15; 16; 18; 20; 25; 30; 32; 36; 40; 45; 50; 60; 80; 100; 150; 200; 250 mm.

1.2.3. Dimensions and limit deviations should conform to the standards given in table.2.

Table 2

Tape thickness, mm	Limit deviation of thickness, mm	Limit deviation width when the width of the tape, mm		Tape width, mm	Length, m, not less
		up to 100 incl.	over 100
		no more
0,10; 0,15	±0,010	-0,3	-0,5	6−200	40
0,20; 0,22; 0,25	±0,015	-0,3	-0,5	6−250	40
0,28; 0,30; 0,32; 0,35; 0,36; 0,40	±0,020	-0,3	-0,5	6−250	40
0,45; 0,50	±0,025	-0,3	-0,5	6−250	40
0,55; 0,60; 0,70	±0,030			6−250
0,80; 0,90	±0,035	-0,4	-0,6		20
1,0	±0,045			10−250
1,1; 1,2	±0,045	-0,5	-0,7
1,4; 1,5	±0,055
1,6; 1,8; 2,0	±0,065
2,2	±0,065		-	20−80
2,5; 2,8; 3,0; 3,2	±0,080	-0,6			10
Notes: 1. The party allowed the existence of the tape segments with a length of at least half of the given in table.2, in an amount of not more than 5% (by weight). 2. It is possible to produce tapes with welded seams.

1.2.4. The camber of the tape, 1 m of length shall not exceed:

10 mm — for tapes of a width of less than 20 mm;

5 mm, for tape widths of 20−50 mm;

3 mm for belt width more than 50 mm.

An example of a legend tape with a thickness of 1.5 mm, a width of 20 mm, of ordinary quality, without regulation of mechanical properties of alloy grade KH23JU5T for heating elements:

Tape 1.5 x 20−1-BM-KH23JU5T-N GOST 12766.2−90

1.3. Features

1.3.1. The tape is made from alloy grades H15YU5, KH23JU5, KH27JU5T, KH23JU5T, H15N60, H15N60-H, CR20NI80-H, KHN20JUS with the chemical composition according to GOST 10994.

1.3.2. Tape thickness 0.2 mm and more are made in soft annealed condition, of a thickness not exceeding 0.2 mm — cold-worked condition. By agreement with the consumer allowed to produce the tape from the etched surface.

1.3.3. Allowable deviation of electrical resistance up to 1 meter of tape from the nominal shall not exceed ±5% — for tapes of higher quality, and ±7% for ribbon normal quality.

1.3.4. The variation of the electrical resistance of tape within a roll (coil mandrels) must not exceed 4%.

1.3.5. Electrical resistivity of the tape in the soft annealed condition shall conform to the standards given in table.3.

Table 3

Brand alloys	Electrical resistivity, μω·m
H15YU5	1,24−1,34
KH23JU5	1,30−1,40
KH23JU5T	1,34-of 1.45
KH27JU5T	1,37−1,45
H15N60, H15N60-H	1,05−1,16
CR20NI80-H	1,06−1,17
KHN20JUS	0,99−1,07

Notes:

1. (Deleted, Rev. N 1).

2. Nominal electrical resistivity is given in Appendix 1.

1.3.6. The tenacity of alloys is designed for heating elements, tested according to the method G, must conform to the standards given in table.4.

Table 4

Grade	Test temperature, °C	Vitality, 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

1.3.5, 1.3.6. (Changed edition, Rev. N 1).

1.3.7. (Deleted, Rev. N 1).

1.3.8. The tape surface should be free of tears, captivity, cracks, and dross. Allowed nicks, prints, risks, scratches, and some small films, not bringing the ribbon over the limit deviation on thickness. The surface should be dark, dark gray, gray, or covered with a thin oxide film tint. At customer’s request, surface quality tape should conform to the models agreed upon in the prescribed manner.

1.3.9. On the edges of the belt are allowed burrs and other defects, not bringing the ribbon over the limit deviations on width, and burrs, not larger than the sum of limit deviations for thickness.

1.3.10. The tape during the bending test until the parallelism of the sides must be free of cracks and delamination in the bend.

1.3.11. At the customer’s request of mechanical properties of strip thickness of 0.2 mm or more in the delivery condition shall comply with the standards given in table.6.

Table 6*

________________
* Table.5. (Deleted, Rev. N 1).

Grade	Temporary tear resistance , N/mm(kgf/mm), not more	Elongation , %, not less
H15YU5	736 (75)	16
KH23JU5	736 (75)	14
KH23JU5T	765 (78)	12
KH27JU5T	785 (80)	10
H15N60, H15N60-H, CR20NI80-H	834 (85)	20
KHN20JUS	736 (75)	25

(Changed edition, Rev. N 1).

1.3.12. Correction factors for calculating changes in electrical resistance depending on temperature is given in Appendix 2; maximum operating temperature, physical and mechanical properties of alloys in annexes 4−6 GOST 12766.1.

1.4. Marking

1.4.1. Labeling — according GOST 7566.

1.4.2. Transport marking under GOST 14192.

1.5. Packaging

1.5.1. Packaging — according to GOST 7566 with additions.

1.5.1.1. Tape with a thickness of 0.2 mm or more must be wound in coils. The tape with thickness less than 0.2 mm is wound on the coil mandrel. Roll, coil, the mandrel should consist of a single piece of belt. Allowed in the coil, the coil, the mandrel is not more than four pieces of tape, indicating their number in the document about quality. Segments must be separated by spacers.

1.5.1.2. Tape with a thickness of less than 0.5 mm in coils, on spools or mandrels should be wrapped in one or more layers of paper according to GOST 8828, GOST 9569* or GOST 10396 and Packed tight in rows in boxes of types I or II according to GOST 2991 or other regulatory-technical documentation.
________________
* On the territory of the Russian Federation the document is not valid. Valid GOST 9569−2006, here and hereafter. — Note the manufacturer’s database.

1.5.1.3. The rolls of tape with a thickness of 0.5 mm or more are Packed in one or more layers of paper according to GOST 8828, 9569 or GOST GOST 10396 and film according to GOST 10354, GOST 16272 or container helostomatidae cloth, stitched the flap of waste textile industry or other types of packaging materials according to normative-technical documentation, with the exception of cotton and linen fabrics.

Packed rolls must be tied with wire according to GOST 3282 or other normative and technical documentation or tape according to GOST 3560, GOST 6009, or other regulatory technical documentation or some other way to protect the packs from unwinding.

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

1.5.1.4. Allowed the transport of coils of tape on the pallets, the rolls shall be wrapped in crepe paper according to GOST 10396 or other regulatory-technical documentation and attached to the pallet with soft metal tape according to GOST 3560, GOST 6009 or other normative and technical documentation or wire according to GOST 3282 or other normative and technical documentation in at least three places.

1.5.1.5. By agreement between manufacturer and consumer tape thickness of 0.6 mm or more is allowed to transport without wrapping paper on pallets according to normative-technical documentation, developed in accordance with the requirements of GOST 9078, GOST 9570 linking foot in four places over the pan and puff the castle.

1.5.1.6. For protection of the tape on the iron-chromium based corrosion is allowed to apply a neutral lubricant according to GOST 20799.

1.5.1.7. Weight of cargo must not exceed:

80 kg — with manual loading and unloading;

1250 kg — with mechanized loading and unloading.

1.5.1.8. Dimensions of the cargo must not exceed 1240·840·1350 mm.

2. ACCEPTANCE

2.1. The ribbon take parties. The party must consist of one of the metal melt and of the same size and must be issued a document about quality that contains:

trademark or name or the name and trademark of manufacturer;

the symbol of the tape;

the weight of the party;

test results*;
_________________
* Document the quality in the line «results of tests of the survivability of» record «is». The manufacturer is allowed survivability is not controlled.

the chemical composition of the alloy.

(Changed edition, Rev. N 1).

2.2. To check the quality of the tape from the party is taken:

to control the size, surface quality — 100% rolls (coils, bars);

to control the camber — 3% rolls (coils, bars), but not less than three;

to control chemical composition — one sample from the melt;

to control survivability — a single sample of weight, enough to make at least 5 m wire diameter: 0.8 mm;

to control the electrical resistivity, the electrical resistance of 1 m, mechanical properties and strip bending three roll (coil mandrels);

to control the variation of electric resistance of 1 m within a coil (coil mandrels) — single coil (coil, bar).

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

2.4. The tenacity of alloys is certified according to a quality document issued by the company, smelting the metal, according to test results of other heats one cycle of melting.

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.

3.2. The thickness of the tape is measured with a micrometer according to GOST 6507 or GOST 4381, optimera or other measurement means appropriate accuracy. The tape width is measured by caliper according to GOST 166. The thickness of the strip width less than 20 mm measured in the middle, and a width of 20 mm and a distance of not less than 5 mm from the edge.

3.3. Camber test in accordance with GOST 26877.

3.4. The electrical resistance of the tape is determined according to GOST 7229 with the use of instruments of accuracy class of 0.05. Sample length not less than 250 mm. For hard-drawn tape electrical resistance determined on the samples treated by mode: for Nickel-containing alloys, heating to a temperature of (1000±20) °C, exposure time 20 min, air cooling; for iron-chromium-aluminum alloys — heat (780±20) °C, exposure time 30 min, air cooling.

3.5. The nominal electrical resistance of a 1 m strip (), Ω, is calculated by the formula

,

where is the nominal electrical resistivity in accordance with Annex 1, μω·m;

 — the sample length is 1 m;

 — nominal thickness of tape, m;

 — the nominal width of the tape is reduced to half of the limit deviations on width, m.

3.6. To determine the variation of electrical resistance of the tape within the coil (coil mandrels) measure the electrical resistance at the beginning and end of the roll (coil mandrels) and the difference between them refers to the average of the resulting values and multiplied by 100%.

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

,

where  — electrical resistance of sample, Ohms;

 — actual area of the cross section, m;

 — length of sample, m

3.8. Survivability is determined according to GOST 2419 according to the method G, the test is performed until it fails.

(Changed edition, Rev. N 1).

3.9. The surface quality is checked visually. If necessary, the depth of the defect is determined by the sweep. The location of the defect is cleaned before it is deleted, and comparing the thickness of the ribbon, in the stripped and unstripped areas. Determination of defect depth can be a depth gauge or by metallographic methods.

3.10. Tape testing Flexural carried out according to GOST 14019. The mandrel diameter for strips of thickness from 0.1 to 2.0 mm should be equal to three times the thickness of the strip, for strips of thickness greater than 2.0 mm or five — fold thickness of the tape. For hard-drawn tape tests performed on thermally treated samples.

3.11. Mechanical properties determined on short samples of the type II according to GOST 11701.

3.12. For each type of test should be taken one sample from each selected coil (coil mandrels).

4. TRANSPORTATION AND STORAGE

4.1. Transportation — according to GOST 7566 with additions.

4.1.1. Transportation must be carried out by all kinds of transport in covered vehicles or containers in accordance with the rules of cargo transportation applicable to transportation of this type, and the technical conditions of loading and fastening of cargoes, approved by the Ministry of Railways of the USSR.

4.1.2. When you ship two or more packages to one of the consumer spend consolidation packages in accordance with GOST 21650, GOST 24597.

4.2. Storage conditions of the tape for up to 1 month. — SIS according to GOST 15150, for a period of more than 1 month. — 1L according to GOST 15150.

5. MANUFACTURER’S WARRANTY

5.1. The manufacturer guarantees the conformity of the tape to the requirements of this standard when complying with the storage conditions.

Warranty period of storage alloy ribbon of stamps KHN20JUS, H15N60, H15N60-H, CR20NI80-H — three years from the date of manufacture; for grades H15YU5, KH23JU5T, KH23JU5, KH27JU5T two years from the date of manufacture.

ANNEX 1 (reference). The nominal values of electrical resistivity

ANNEX 1
Reference

THE NOMINAL VALUES OF ELECTRICAL RESISTIVITY, ΜΩ·M

Table 7

Grade	The nominal value of the electrical resistivity, μω·m
H15YU5	1,29
KH23JU5	1,35
KH23JU5T	1,39
KH27JU5T	1,42
H15N60, H15N60-H	1,10
CR20NI80-H	1,11
KHN20JUS	1,02

ANNEX 2 (informative). Correction factors for calculating changes in electrical resistance depending on temperature

ANNEX 2
Reference

Table 8

Grade	The values of the correction factor at 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	1,083	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 regulated in this standard: for grades H15N60 and H15N60-H — 3%, for alloy grade CR20NI80-H — 5% and below, governed by this standard: for grade H15YU5 — 2%; for grades KH23JU5, KH23JU5T, KH27JU5T — 4% for alloy grade KHN20JUS.