GOST 931-90

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  ГОСТ 931-90

GOST 931−90 Sheets and strips of brass. Specifications

GOST 931−90

Group В53

INTERSTATE STANDARD

SHEETS AND STRIPS OF BRASS

Specifications

Brass sheets and strips. Specifications

ISS 77.150.30
GST 18 4520

Date of introduction 1992−01−01

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 20.07.90 N 2224

3. The standard fully complies ST SEV 957−89

4. REPLACE GOST 931−78

5. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS

6. Limitation of actions taken by Protocol No. 7−95 Interstate Council for standardization, Metrology and certification (ICS 11−95)

7. EDITION (December 2002), as amended (ICS 9−98)


This standard applies to brass hot rolled and cold rolled sheets and cold-rolled strip of General purpose.

1. TECHNICAL REQUIREMENTS

1.1. Sheets are produced 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. The thickness of the hot-rolled sheets and tolerances for thickness shall be as given in table.1.

Table 1

mm

1.2.2. Width of hot-rolled sheets and tolerances for the width shall be as given in table.2.

Table 2

Note. Each width dimension can correspond to any length of the given in table.3, provided that the length exceeds the width.


1.2.3. Length of hot-rolled sheets and tolerances for length shall be as given in table.3.

Table 3

1.2.4. Thickness of cold rolled sheets and tolerances for thickness shall be as given in table.4.

Table 4

Dimensions, mm

1.2.5. Width of cold rolled sheets and tolerances for the width shall be as given in table.5.

Table 5

Dimensions, mm

1.2.6. Length of cold rolled sheets and tolerances for length shall be as given in table.6.

Table 6

Dimensions, mm

1.2.7. Permitted short-length sticks of hot-rolled and cold-rolled sheets in an amount of not more than 15% of the batch weight. The sizes of short-length sticks of sheets shall be not less than 500х1000 mm.

1.2.8. Thickness and limit deviation on thickness of cold rolled strips shall be as given in table.7.

Table 7

Dimensions, mm

1.2.9. Width and limit deviations on width of cold rolled strips normal accuracy shall be as given in table.8.

Table 8

mm

1.2.10. Width and limit deviations on width of cold rolled strips of high accuracy shall be as given in table.9.

Table 9

mm

1.2.11. Strips are manufactured in length from 500 to 2000 mm dimensional dimensional with an interval of 500 mm and random length.

Maximum deviation on length and multiple dimensional length minus 10 mm.

1.2.12. Theoretical weight of 1 msteel hot-rolled and cold-rolled sheets and strips is given in Appendix 1.

1.2.13. Dimensions, accuracy of manufacture, the condition of the material, the brand of brass sheets and strips the consumer specifies in the order. In the absence of claims in the order the accuracy of manufacturing determined by the manufacturer.

The legend is present according to the scheme:

when the following abbreviations:

Method of manufacture:

HR — G;

cold-rolled — D.

Sectional shape:

rectangular (th) — OL.

Precision manufacturing (for bands):

normal thickness and width — N;

increased in thickness and width — P;

normal thickness and increased width — K;

increased thickness and normal width — I.

Precision manufacturing in length of cold rolled sheets:

normal — N;

increased — P;

high — V.

Condition:

soft — M;

semi-solid — P;

solid — T;

extra hard — O.

Length (dimension):

random — ND;

dimensional — MD;

dimensional — CD.

Special conditions:

antimagnetic — AM.

The dimension is specified only for the bands.

Instead of the missing data is X, in addition to indicating the length (dimensionality) and special conditions.

Examples of symbols:

Steel hot-rolled sheet size 5х600х1500 mm brass brands L63:

Sheet GPRH 5х600х1500 L63 GOST 931−90

Steel cold-rolled sheet, high precision manufacturing in length, soft, size 4х1000х2000 mm brass brand Lmc58−2:

Sheet DPCM 4х1000х2000 LM 58−2 GOST 931−90

Strip is cold rolled, the normal accuracy in thickness and width, solid, size 2,5х400х1000 mm, measuring length, brass brand LO62−1:

Strip DPRNT 2,5х400х1000 MD LO62−1 GOST 931−90

(Amendment).

1.3. Features

1.3.1. Sheets and strips made of brass grades according to GOST 15527*:

hot rolled sheets are produced from brass brands L63, LO62−1, LS59−1 and Lmc58−2;

cold-rolled sheets and strips — brass brands L90, L85, L80, L68, L63, Lmc58−2, LO62−1 and LS59−1.
_______________
* Valid GOST 15527−2004. — Note the CODE.

1.3.2. As material sheets and strips are made:

soft brands of brass L90, L85, L80, L68, L63, Lmc58−2 LS59−1;

semi-solid — brass brands L90, L85, L80, L68, L63, LS59−1 and Lmc58−2;

solid — brass brands L90, L85, L80, L68, L63, LS59−1, Lmc58−2 and LO62−1;

of extra hard brass brands L63 and L68;

spring-solid — brass brands L63.

Extra hard sheets and strip manufacture with thickness up to 2 mm inclusive.

1.3.3. The surface of the plates and strips must be smooth, clean, free from contamination, hinder visual inspection.

Allowed some minor surface defects, not outputting the sheets and strip at reference sweep for tolerances for thickness.

Allowed for soft sheets and strip local minor darkening, reddening and color tint.

1.3.4. Soft sheets and strip must be pretreated with.

After basocellular annealing soft sheets and strip, etching can not be.

1.3.5. Features basic performance

1.3.5.1. Sheets and strips must be flat.

The deflection should not exceed 1,0 mm per 100 mm width and 20 mm for every 1000 mm length.

1.3.5.2. Sheets and strip, should be trimmed evenly and must not have significant burrs.

Inversion of the edge wavy and ragged edge are not allowed.

Cut end Squareness, mm must not exceed the tolerances for width and length.

1.3.5.3. Camber strips up to a thickness of 4 mm shall not exceed 5 mm per 1 m of length, thickness greater than 4 mm — 8 mm per 1 m length.

1.3.5.4. Mechanical properties of sheets and strips shall be as given in table.10.

Table 10

Notes:

1. The upper limit of the strength may be higher, but not more than 20 N/mm(kgf 2/mm) while maintaining elongation not less than shown in table.10.

2. Hardness values are given in Appendix 2.

3. Height when testing on the hood of spherical wells are presented in Appendix 3.


1.3.5.5. Cold-rolled sheets and strips, thickness 1,0−10,0 mm shall withstand a bend test in cold state along the rolling:

soft by 180°,

semi-solid — 90°

around the mandrel with a radius of curvature equal to the thickness of the sheet or strip. The appearance of traces of tears and cracks are not allowed.

1.3.6. Characteristics of performance that are installed at the customer’s request

1.3.6.1. The hot-rolled sheets made of intermediate sizes in thickness, width, length with utmost deviations on the nearest larger size given in table.1, 2, 3.

1.3.6.2. The cold-rolled sheets manufactured intermediate sizes in thickness, width, length with utmost deviations on the nearest larger size given in table.4, 5 and 6.

1.3.6.3. The cold-rolled sheets are made of high accuracy in length with maximum deviation of sheet thickness up to 3 mm inclusive — minus 5 mm, a thickness exceeding 3 mm or minus 10 mm.

1.3.6.4. Sheets cold-rolled manufactures high precision in length with maximum deviation of for sheets thicker than 3 mm minus 6 mm.

1.3.6.5. Stripes are made of intermediate sizes in thickness, width, length with utmost deviations on the nearest larger size given in table.7, 8 and 9.

The strip of high accuracy in width made:

thickness up to 1 mm incl. — of a width up to 100 mm incl.;

to 2 mm thick incl. — width from 150 mm to 600 mm incl.

Strip gauging and multiple of gauging length are made with maximum deviation in length minus 10 mm.

1.3.6.6. Sheets and strips made of high accuracy on deflection — not more than 0.8 mm per 100 mm width and not more than 15 mm for every 1000 mm length.

1.3.6.7. Sheets and strips made antimagnetic in accordance with GOST 15527.

1.3.6.8. Sheets and strip in semi-solid state of the brass brands L63 manufactured with the temporary resistance of 380 (39) 470 (48) N/mm(kgf/mm).

1.3.6.9. Cold-rolled sheets and strips are manufactured with mechanical properties given in table.11.

Table 11

1.3.7. Characteristics of performance established by agreement between the consumer and the manufacturer

1.3.7.1. Allowed the requirements to the surface quality set by the standards, approved in the prescribed manner.

1.3.7.2. Hot-rolled and cold-rolled sheets with a thickness over 4 mm are made with a rolled edge without cropping.

1.3.7.3. Cold-rolled sheets and strips of a thickness of 1−10 mm, tested in bending in the direction of rolling, tensile tests are not subjected to.

1.3.7.4. Allowed for tensile tests and bending to take away two leaves or two lanes from the party.

1.4. Marking

1.4.1. At the end of each sheet or strip firmly attached on the paper label must be applied do not flush with water paint:

trademark or a trademark and the name of the manufacturer;

designation sheets or strips;

batch number;

stamp or stamp of the technical control Department.

When shipping sheets and strips, tied in bundles, the data is applied to the label affixed to the package or pasted on the top bar or top sheet of the stack.

1.4.2. Transport marking, site of application, method of execution of the transport marking, the method of attaching the label according to GOST 14192 with the application of manipulation sign «Protect from moisture».

When transporting goods by air transport labels must be wooden or metal and secured with two sides.

1.5. Packaging

1.5.1. The packaging should provide protection sheets and strips from mechanical damage, moisture and active chemical substances in the process of transportation and storage.

Sheets and strip, of thickness up to 1.5 mm must be Packed in tight wooden or crates.

Allowed to pack sheets and strips of a thickness up to 1.5 mm in packs. Packs should be wrapped in two layers of paper and secure the top and bottom boards (only for bars) or wooden boards, the dimensions of which correspond to the width and length of the bundles, and tied in at least two areas or cross band size not less than 0,3x20 mm or a wire with a minimum thickness of 2 mm.

Sheets and strip, of a thickness of 1.5 mm or more must be Packed in bundles with double-sided protection tied with shields the size of a pack as described above.

Allowed sheets and strips of a thickness of 1.5 mm and a weight of each sheet or strip exceeding 30 kg, Packed in containers according to GOST 18477 or universal or specialized containers according to normative-technical documentation without packaging and without protection by wooden shields.

The plates and strips must be laid and fastened so that not moved during the transportation and loading and unloading. As packaging AIDS and materials and means of bonding shall apply:

boxes of types I, II-1, II-2, III-3, V-1, V-2, VI-1, VI-3 according to GOST 2991 and types I-1, I-2 according to GOST 10198*;
_______________
* Standards 10198−91. — Note the CODE.

sizes of boxes according to GOST 21140 or according to normative-technical documentation;

Board according to normative-technical documentation;

paper grades In a-70, B-78 or B according to GOST 2228;

tape according to GOST 3560;

wire according to GOST 3282.

Packaging and transport of sheets and strips for the far North regions or equated areas — according to GOST 15846*.

_______________
* Standards 15846−2002. — Note the CODE.

1.5.2. The package needs to be formed into transport packets. Dimensions of packages — according to GOST 24597.

Means bonding in the transport packets according to GOST 21650.

The weight of the package or overpack shall not exceed 1250 kg.

1.5.3. Packaging is carried out on pallets according to GOST 9557 or using the bricks of size not less than 50x50 mm and a length equal to the width of the package, in accordance with the requirements of GOST 26663.

Transport packages must be wrapped in at least two areas or cross wire with a diameter of not less than 3 mm according to GOST 3282 or tape of size not less than 0,5h30 mm according to GOST 3560.

The ends of the wrapping wire fasten cable at least five turns of tape in the castle.

1.5.4. In each container should be nested packing list indicating the data provided in claim 1.4.1, and the batch weight (net).

2. ACCEPTANCE

2.1. Sheets and strip, take parties. The party should consist of sheets and strips of the same size, one method of manufacture, one brand of brass, one state, one precision manufacturing and accompanied by a document about quality that contains:

trademark or a trademark and the name of the manufacturer;

designation sheets or strips;

the results of the tests;

batch number;

the weight of the party.

2.2. The chemical composition determined on two sheets or two pages from the party.

Allowed to the manufacturer of the sampling carried out by the molten metal.

2.3. To control the thickness of the sheets and strips from party select sheets and strips «blind» (by the greatest objectivity) according to GOST 18321. Control plan — GOST 18242*.
________________
* On the territory of the Russian Federation GOST R 50779.71−99.

The number of monitored sheets and strips are selected in accordance with table.12.

Table 12

When thickness control the number of controlled points on each selected sheet or strip is determined depending on the total number of parcels with a length of 100 mm along the perimeter of the sheet or strip at the table.13.

Table 13

If the perimeter is not a multiple of 100 mm, the end portion of a length of over 50 mm but not exceeding 100 mm is taken for one site.

Selected sheets and strip, think fit in thickness, if the number of measurement results do not comply with the limit deviations, given in table.1, 4, 7, less than the acceptance number given in table.13.

2.3.1. To control the width, length and skew of the cut sheet and strip from party select sheets and strip, in accordance with the table.14.

Table 14

The party is considered usable if the number of sheets or strips that do not meet the requirements of table.2, 3, 5, 8, 9 and PP.1.2.11 and 1.3.5.2, less than the acceptance number given in table.14.

Allowed the manufacturer if unsatisfactory result on one of the selected sheets or on one of the selected bands to control each sheet or each strip party.

Allowed the manufacturer to carry out the control sheets and strips during the production process.

2.4. Checking the quality of the surface subjected to each sheet or strip of the batch.

2.5. Checking the deflection is subjected to two sheets or two lanes from the party.

2.6. For tensile testing (tensile strength and elongation) and bending taken away by two sheets or two lanes from each 1000 kg or less.

For sheets and strips of a thickness more than 8 mm for tensile testing and bend are taken at two sheets or two lanes from each of the full 3,000 kg or less.

The elongation is determined for sheets and strips of a thickness of 0.5 mm or more.

Test of sheets and strips of brass stamps LS59−1 bending is performed according to the requirement of the user.

2.7. If unsatisfactory test results of at least one of the indicators it is carried out re-testing at twice the sample taken from the same batch.

The results of repeated testing are spreading to the entire party.

3. CONTROL METHODS

3.1. For the analysis of chemical composition of sheets and strips from each selected worksheet or selected from each strip cut one sample.

The selection and preparation of samples for chemical analysis is carried out according to GOST 24231.

Chemical composition analysis is carried out according to GOST 25086, 1652.1 GOST-GOST and GOST 1652.13 9716.1-GOST 9716.3 or other methods of equal precision specified.

In case of disagreement the analysis of the chemical composition is carried out according to GOST 25086, 1652.1 GOST-GOST 1652.13.

3.2. Checking the quality of the surface and edges of sheets and strips is carried out by inspection without the use of magnifying devices.

3.3. The thickness of the sheets and strips is measured with a micrometer according to GOST 6507 or GOST 4381.

Measuring the thickness of sheets and strips is carried out at a minimum distance of 100 mm from the vertex of the angle and not less than 15 mm from the sheet edge or 10 mm from the edge of the strip.

Control the thickness of the sheets or strips is carried out with the acceptance level of defects =4%.

The thickness of sheet and strip are measured at each selected worksheet or each selected strip at points positioned uniformly randomly along the perimeter of the sheet or strip.

The number of sheets or strips in a party ()., is calculated by the formula

,

where the weight of the batch, kg;

 — material density, g/cm;

 — the thickness of the sheet (strip), mm;

 — the width of the sheet (strip), mm;

 — the length of the sheet (strip), mm.

Number of controlled sections in sheet or strip (), EA, is calculated by the formula

.

The results of measuring the thickness of the sheets or strips that do not correspond to the limit deviations, given in table.1, 4, 7, should not differ from the permissible by more than half of the tolerance field.

3.4. Measurement of width, length and skew of the cut sheet, the width and length of the bands is carried out with a metal ruler according to GOST 427 or metal measuring tape according to GOST 7502 or a caliper according to GOST 166. The width measurement is carried out in a single place at a distance of 100 mm from the edge of the sheet or strip.

Measurement of the skew cut is carried out according to GOST 26877*.
_______________
* Valid to GOST 26877−91. — Note the CODE.

3.5. Measurement of bending of sheets and strips is carried out according to GOST 26877.

3.6. The bend test is carried out according to GOST 14019*.
_______________
* Standards 14019−2003. — Note the CODE.

3.7. Camber is measured according to GOST 26877.

3.8. For tensile testing from each of the selected or each selected sheet strip cut one sample. Sampling — according to GOST 24047.

Tensile test of sheets and strips of a thickness from 0.4 to 3 mm is carried out according to GOST 11701 the samples of a type I or II with the initial design length =11,3, a width of 20 or 15 mm.

Tensile test of sheets and strips of a thickness of 3 mm or more is carried out according to GOST 1497на the samples of a type I or II with a width of 20 mm for sheets and strips of a thickness up to 7 mm inclusive and a width of 30 mm for sheets and strips of a thickness more than 7 mm. the Initial gauge length of samples equal to 11.3.

3.9. Allowed the manufacturer to use other means of measurement and testing methods, providing the required accuracy set out in this standard.

In the event of any dispute apply tools of measurement and methods of control established in the PP.3.2−3.8.

4. TRANSPORTATION AND STORAGE

4.1. Sheets and strip transporterowych all types of transport in covered vehicles 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.

Transportation of sheets and strips of rail are conducting small, low-tonnage and carload shipments.

When the length of the sheets or strips of more than 3 m and weight of the package more than 1250 kg transportation is made in covered wagons or on the open rolling stock in containers according to GOST 18477 or according to normative-technical documentation.

When there is no overload in the path of allowed sheets and strips to be transported in containers according to GOST 18477 or according to normative-technical documentation in the packaged form without packaging in boxes and without the protection of wooden boards.

4.2. The leaves are stored in covered premises. When storing sheets and strips shall be protected from moisture, mechanical damage and exposure to active chemical agents. Under specified storage conditions consumer properties of sheet and strip during storage are not changed.

ANNEX 1 (reference). THEORETICAL WEIGHT of 1 square meter hot rolled AND cold ROLLED SHEETS AND STRIPS

ANNEX 1
Reference

THEORETICAL WEIGHT of 1 msteel hot-ROLLED AND cold-ROLLED
SHEETS AND STRIPS

Table 15

Note. When calculating the theoretical mass density of brass brands L90, L85, L80 estimated to be equal to 8.7 g/cm, and brass brands L68, L63, LS59−1, Lmc58−2 and LO62−1 — equal to 8.5 g/GM.

ANNEX 2 (informative). HARDNESS OF COLD ROLLED SHEETS AND STRIPS

ANNEX 2
Reference

Table 16

APPENDIX 3 (reference). DRAWING DEPTH WHEN TESTING ON the HOOD of the SPHERICAL HOLES in the PUNCH RADIUS 10 mm

APPENDIX 3
Reference

Table 17

Dimensions, mm