GOST 21997-76

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  ГОСТ 21997-76

GOST 21997−76 flattened steel Strip of high strength. Technical specifications (with Changes 1−5 N)

GOST 21997−76
Group B34

INTERSTATE STANDARD

FLATTENED STEEL STRIP FOR HIGH STRENGTH

Specifications

High tensile steel flattened strip. Specifications

OKP 12 3100

Date of introduction 1978−01−01

INFORMATION DATA

1. DEVELOPED by the Central Scientific research Institute of the hardware industry (NIIMETIZ)

INTRODUCED by the Ministry of ferrous metallurgy of the USSR

2. APPROVED AND promulgated by the Decree of the State Committee of standards of Ministerial Council of the USSR from 12.07.76 N 1695

3. REPLACE GOST 2614−65 in part of crimped ribbon

4. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS

5. Resolution of the state standard from 29.12.91 N 2367 the expiration time limit removed

6. EDITION Changes N 1, 2, 3, 4, 5, approved in April 1981, December 1982, June 1987, August 1989, December 1991 (IUS 7−81, 3−83, 9−87, 12−89, 5−92)


This standard applies to the tape rolled high strength steels, tool and spring steel for the manufacture of spring parts and spring, with the exception of clockwork.

(Changed edition, Rev. N 3, 4).

1. CLASSIFICATION AND ASSORTMENT

1.1. The tape is divided into:

a) according to the type of processing:

heat-treated (after quenching with tempering),

nagaremono — G;

b) for the strength (ultimate tensile strength or hardness) into groups:

first — 1P,

second — 2P,

third — 3P;

C) for precision manufacturing:

thickness:

normal exactly

increased accuracy — FRI,

high precision — W;

width:

normal exactly

increased accuracy — PH

high — precision HS;

d) kind of surface:

bright,

bright with the colors of a tint — TS,

polished,

colorsound,

dark — H

(Changed edition, Rev. N 1).

1.2. Tape made sizes specified in table.1.

Table 1

mm

Extension table 1

mm

Note. The sign «+" means that the tape is of specified dimensions is made, the sign «-" means that the specified tape size is not manufactured.

1.3. Limit deviations of the dimensions of the tape shall be as specified in table.2 and 3.

Table 2

mm

Table 3

mm

Examples of symbols

Tape nagarebana, group strength 2P, high-precision thickness, normal accuracy in width, polished, size 0,4 x 4,0 mm:

Tape G-2P-W-S-0,4x4,0 GOST 21997−76

Same, heat-treated, strength group 3P, manufacturing high precision thickness and width, dark, size 0,6x1,4 mm:

Tape 3P-PT-PN-CH-0,6x1,4 GOST 21997−76

Ribbon of steel 65G, Nagarjuna, group strength 2P, manufacturing high precision on the thickness, normal accuracy in width, polished, size 1,00х5,0 mm:

Tape 65G-G-2P-PT-WITH-1x5 GOST 21997−76.

(Changed edition, Rev. N 3, 4).

2. TECHNICAL REQUIREMENTS

2.1. Tape shall be manufactured in accordance with the requirements of this standard for technological regulations approved in the prescribed manner, of steel grades 60 Pogost 1050; U7A, U8A, U9A, U10A, U12A according to GOST 1435; 70, 65G, 60S2A, 70S2KHA according to GOST 14959.

In the manufacture of the tapes from the patented wire-billets chemical composition of steels in accordance with note 6 of table 1 GOST 14959.

At the request of the consumer tape is made from a specific grade of steel from among those listed in paragraph 2.1.

(Changed edition, Rev. N 3, 5).

2.2. The tape should be heat-treated or work-hardened. Treatment is determined by the manufacturer.

2.3. Rupture strength or hardness of the tape shall be as specified in table.4.

Table 4

Notes:

1. (Deleted, Rev. N 3).

2. The tape with thickness less than 0.25 mm hardness do not.


Fabrication tape is one of the indicators of strength (temporary resistance or hardness). The other indicator is not controlled.

(Changed edition, Rev. N 3).

2.4. At customer’s request, the tape must withstand the test of inflection. The number of bends should conform to the standards specified in table.5. Tape 1P and 2P groups strength thickness greater than 1.0 mm and the tape 3P strength group thickness more than 0.8 mm at the inflection are not experiencing.

Table 5

(Changed edition, Rev. N 1, 3).

2.5. On the surface of the tape should not be sunsets, bundles, scratches and rust. Not allowed longitudinal scratches, shell, the risks, the prints from the rolls, the depth or height for light, bright with the colors of a tint, polished, colorsound strips exceeds half of the maximum deviations in thickness, for dark strips — limit deviation on thickness.

(Changed edition, Rev. N 3, 4).

2.6. Light tape should have a surface from light gray to dark gray color. On the surface of the bright strip allowed the remnants of the technological lubricant (oil, soap and powder) and copper plating.

Bright ribbon with the colors of tint may have a surface with non-uniform colors of tint from pale yellow to dark blue.

Polished tape should have a shiny surface.

Khlorisana tape should have a pre-polished surface. The colorization color from light yellow to dark blue. In a single reel (reel) are allowed simultaneously different hues of the colorization.

The dark ribbon is not regulated. The surface of the dark tape can be covered with a layer of burned grease and oxide film.

2.7. The parameters of surface roughness, bright, bright with the colors of a tint, polished and colorsound tape must be: not more than 0.63 microns, or not more than 3.2 µm according to GOST 2789.

At the request of the consumer, the tape shall be manufactured with the parameters of surface roughness of not more than 0,32 µm or 1.6 µm according to GOST 2789, by agreement with the consumer — with the parameters of surface roughness not more of 0.16 µm or 0.8 µm according to GOST 2789.

2.8. The strip edges should have a natural curve. Cracks and flaws on edges are not allowed.

Allowed grinding of the edges of the belt.

2.9. At the request of the consumer, the tape shall be manufactured with controlled camber not to exceed 2 mm per 1 m length of ribbon and heat-treated 8 mm per 1 m length of ribbon work-hardened.

2.10. On the surface of the tape obesplozhennym layer is not allowed.

2.9, 2.10. (Changed edition, Rev. N 3).

2.11. At the request of the consumer, the tape shall be manufactured with controlled elasticity and microstructure. The provisions of the characteristics are determined by the agreement of consumers and manufacturers.

2.12. The tape shall be supplied in rolls or coils with internal diameter from 120 to 550 mm.

2.13. A coil (coil) must consist of one segment. Allowed in a single reel (reel) no more than three pieces of tape, one bottoms, one type of treatment, one group of strength and precision manufacturing, one type of surface. The length of each segment must be at least 20 m.

Individual segments of the tape must be supplied without welding. Place of winding should be checked. The number of such skeins (coils) must not exceed 10% of the party.

2.14. The minimum mass of a coil (coil), consisting of one segment, is set at the rate of 0.6 kg per 1 mmcross section tape.

3. ACCEPTANCE RULES

3.1. The ribbon take parties. The party should consist of tape one melting, one steel grade, the same type of treatment, one group of strength, same size, same precision manufacturing, one type of surface and be accompanied by a document about quality that contains:

trademark or the name and trademark of manufacturer;

the symbol of the tape;

grade of steel;

the number of melt indicating plotnogo chemical analysis;

the results of the tests;

the number of coils (coils);

the weight of the party;

batch number.

By agreement between manufacturer and consumer in the document as it is allowed to omit the results of all tests, and indicate: «Products correspond to GOST 21997−76».

(Changed edition, Rev. N 3, 4).

3.2. Inspection appearance and dimensions shall be subjected to each coil (coil) party tape.

(Changed edition, Rev. N 2).

3.3. From party ribbon, adopted p.3.2, should be selected:

to check the temporary tear resistance or hardness, the number of excesses — 10% coils (coils), but not less than two skeins (coils);

to check camber, parameters of surface roughness, decarburization — 5% skeins (coils), but not less than two skeins (coils);

to check the chemical composition of steel when needed — 2% skeins (coils), but not less than two skeins (coils).

3.4. If unsatisfactory test results of at least one of the indicators it is carried out re-tests on twice the number of skeins (coils) of the number of not passed tests.

The results of repeated tests apply to the entire party.

3.3, 3.4. (Changed edition, Rev. N 3).

4. TEST METHODS

4.1. The quality of the surface and the edges of the belt should be inspected visually without the use of magnifying devices. In controversial cases, allowed to use the magnifying glass with five times magnification.

4.2. The thickness and width of ribbon, size of defects is measured by using micrometers (GOST 6507 or GOST 4381) and other means of measuring the respective accuracy.

The size of defect is determined by the destruction of its sweep, followed by a comparative measurement in stripped and not stripped.

(Changed edition, Rev. N 3).

4.3. The test strip in tension shall be carried out according to GOST 11701.

4.4. Hardness Vickers should be carried out according to GOST 2999.

Tape thickness of 0.25 to 0.40 mm was tested at a load of 49 N (5 kgf), tape thickness more than 0.40 mm at a load of 98 N (10 kgf).

The test shall be carried out in the middle of the sample at three points. The final result should be the arithmetic mean of the results of the three trials.

4.5. The test tape at the bend shall be carried out according to GOST 13813. The radius of the rollers of the device must match that specified in the table.5. The lever arm of the device shall meet the following requirements:

4.6. The parameters of surface roughness of the tape should be determined by using profilers-profiling according to GOST 19300 and other measuring instruments of appropriate accuracy.

4.7. Camber shall be checked by combining the edges of the sample tape with a length of 1 m with a straight line. The measurement is performed with a ruler (GOST 427) in the place of greatest curvature.

4.6, 4.7. (Changed edition, Rev. N 3).

4.8. Control of the magnitude of decarburization of the tape must be carried out according to GOST 1763.

With the consent of the consumer is possible to supply the tape without checking bezoperatsionnogo layer.

4.9. Test the tape on the elasticity conducted by the method agreed between the manufacturer and the customer.

4.10. Test tape on the microstructure is carried out according to the procedure agreed between the manufacturer and the consumer.

4.11. The chemical composition of the metal tape is certified by a document of the manufacturer of the metal. If necessary, the chemical composition of the metal strip is determined according to GOST 22536.0 to GOST 22536.10.

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

4.13. Weighing of packages in the party, and if necessary, coils (coils), is made on the scale according to GOST 29329, or other scales, providing weighing accuracy to 1%.

(Added, Rev. N 3).

5. MARKING, PACKAGING, TRANSPORTATION AND STORAGE

5.1. Every roll of ribbon should be tied in at least three places soft metal ribbon or wire according to GOST 3560, GOST 3282 or other regulatory-technical documentation.

The outer end of the tape must be securely fastened.

(Changed edition, Rev. N 2).

5.2. The tape should be coated with one of compositions, which protects the tape against corrosion: a mixture of GSD and industrial oils (GOST 20799) at a ratio of 1:1 mixture of the preservative oil NG-203A (OST 38.01436−87) and industrial oils (GOST 20799) at a ratio of 1:1, industrial oil (GOST 20799) plus 15% additive AKOR-1 (GOST 15171) or other types of preservative oils or mixtures with a different ratio of components, protective properties which are equivalent to those listed.

(Changed edition, Rev. N 1, 4).

5.3. Wire bundles (coils) tape with a thickness of 0.3 mm and less shall be wrapped with a layer of paper and Packed in wooden boxes type II according to GOST 18617 or other normative and technical documentation, tins, containers according to normative-technical documentation. When packaging skeins (coils) of the ribbon to the boxes is permitted to replace wrapping paper coils (coils) vestiarium boxes of paper. Thus, between the ends of the coils must be laid strips of paper.

Wire bundles (coils) tape with the thickness more than 0.3 mm must be Packed using one of the methods listed below.

In manual mode, wire bundles (coils) of the ribbon should be wrapped with a layer of paper, then a layer of film or fabric and tied with wire or tape, thus preventing the package from unrolling — according to GOST 3282, GOST 3560, or other regulatory-technical documentation.

Mechanized method of coils of tape should be wrapped with a layer of cable crepe paper according to GOST or other 10396 crepe paper, equal in protective properties according to normative-technical documentation, simultaneous recording paper wire according to GOST 3282 or other regulatory-technical documentation.

The quality of packaging materials used:

the waxed paper according to GOST 9569;

double-layer paper packaging — according to GOST 8828, paper, wax or other protecting from corrosion, is made according to normative-technical documentation;

the polymer film — according to GOST 10354, GOST 16272 or the other according to normative-technical documentation;

container holstoproshivny canvas — according to normative-technical documentation;

other materials, excluding the application of cotton and linen fabrics and does not deteriorate the quality of the packaging made according to normative-technical documentation, as well as stitched flap from the waste of the textile industry.

(Changed edition, Rev. N 2, 3, 5).

5.3. The tape is sent to the far North and remote areas shall be in accordance with the requirements of this standard.

(Added, Rev. N 5).

5.4. Tape transporterowych by all kinds of transport in covered vehicles in accordance with cargo carriage regulations applicable to transport of this species. For transportation in universal containers according to GOST 15102, 20435 GOST, GOST 22225допускается packing tape in paper.

(Changed edition, Rev. N 2, 3).

5.5. The gross mass of the package should be no more than 200 kg, at the request of the consumer not more than 80 kg.

Consolidation packages in the transport packet is performed according to GOST 21650, GOST 24597. The formation of the transport packet is performed according to GOST 26663. Allowed the formation of packages without the use of pallets.

(Changed edition, Rev. N 3, 5).

5.6. To each coils (the coil) and the cargo should be attached a label, which indicate:

trademark or the name and trademark of manufacturer;

the symbol of the tape;

grade of steel;

stamp of technical control;

batch number.

(Changed edition, Rev. N 3).

5.6. Transport marking under GOST 14192. While in transport the marking is allowed the gross weight and net weight per package (coil, box etc.) to the gross weight of the party.

5.7. Storage tape should be conducted in accordance with conditions 2 GOST 15150.

5.6 a; 5.7. (Changed edition, Rev. N 5).

5.7. (Deleted, Rev. N 3).