GOST 12920-67
STATE STANDARD OF THE USSR
BRASS WIRE
FOR COLD HEADING
SPECIFICATIONS
GOST 12920−67
IPK PUBLISHING HOUSE OF STANDARDS
Moscow
STATE STANDARD OF THE USSR
BRASS WIRE FOR COLD UPSETTING SpecificationsBrass wire for cold upsetting. |
GOST |
Reprint (August 1995) with Modifications № 1, 2, 3, 4, 5, approved in November 1976, may 1981, Post. No. 2270 of 08.05.81, may 1988, April 1991 (IUS 12−76, 7−81, 5−86, 8−88, 6−91)
Approved by the Committee of standards, measures and measuring devices under Council of Ministers of the USSR may 12, 1967, the date of the entry is set
with 01.01.68
By the resolution of Gosstandard dated
This standard applies to brass wire grade L63 for products manufactured by cold heading.
The requirements of this standard are mandatory.
(Changed edition, Rev. No. 4, 5).
1. ASSORTMENT
1.1. Wire diameters and tolerances for them shall be as specified in table. 1.
Table 1
mm
| Wire diameter | Maximum deviation of diameter | |
| normal accuracy | improved accuracy | |
0,80 Of 1.00 |
-0,04 | 0,02 |
1,20 1,25 1,32 1,40 1,45 |
- | |
1,50 1,60 1,70 1,80 Of 2.00 Of 2.16 2,20 2,35 2,40 2,50 2,60 2,64 2,85 Of 3.00 |
-0,04 | - |
3,26 3,35 3,45 3,48 3,50 3,55 3,60 3,85 Of 4.00 |
-0,05 | 0,04 |
4,10 4,38 4,43 4,80 5,00 5,20 5,28 5,80 6,00 6,50 |
- | |
7,00 7,10 7,80 8,00 8,30 8,85 9,00 |
-0,10 | -0,06 |
9,60 9,80 10,50 11,50 |
-0,10 | -0,06 |
Note. The diameters of the bolts, screws, nuts, rivets, pins and screws is given in recommended Appendix 1.
Wire high precision produce according to customer’s demands.
By agreement with the consumer allowed to produce wire diameter of 1.2 mm with a maximum deviation of minus 0.02 mm.
(Changed edition, Rev. No. 3, 4, 5).
1.2. Excluded.
1.3. The roundness of the wire must not exceed the permissible deviations in diameter.
The legend shall appear on the diagram
Abbreviations:
manufacturing method: cold-drawn — D;
sectional shape: round — CU;
accuracy of manufacturing: normal — N;
increased — P;
condition: soft — M;
semi-solid — P;
solid — T;
length: in rolls, W;
(bays)
special conditions: antimagnetic — AM.
Note. Instead of the missing data is «X» (except for notations of special conditions).
Examples of symbols
Wire normal precision manufacturing, semi-solid, with a diameter of 9.0 mm:
Wire DCRP 9,0 BT L63 GOST 12920-67
The same, high precision manufacturing, rigid, with a diameter of 8.0 mm:
Wire DKBT 8,0 BT L63 GOST 12920-67
Same, the normal precision of manufacture, soft, with a diameter of 9.0 mm, antimagnetic:
Wire DKRM 9,0 BT L63 AM GOST 12920-67.
(Changed edition, Rev. No. 3).
2. TECHNICAL REQUIREMENTS
2.1. Wire produced in accordance with the requirements of this standard for technological regulations approved in the prescribed manner, of brass brands L63 with the chemical composition according to GOST 15527−70. Customer’s request wire should produce of antimagnetic brass brands L63 churchyard 15527−70.
2.2. Wire is manufactured in soft and semi-solid States. Customer’s request wire for screws are made in the solid state.
2.1, 2.2. (Changed edition, Rev. No. 3).
2.3. The surface of wire should be clean and smooth, do not have cracks and delamination and surface defects, bringing the wire for the limit deviation for diameter. On the surface of the wire allowed the color of the tint and grease marks.
2.4. Kink the wire should be uniform, not to have foreign inclusions, delamination, cavities and bubbles.
2.5. Mechanical properties the wire shall conform to the standards specified in table. 2.
Table 2
| Condition | Wire diameter, mm | Temporary resistance sin MPa (kgf/mm2) | Elongation after rupture d, % (l = 100mm) |
| not less than | |||
| Soft | From 0.8 to 1.0 | 340 (35) | 26 |
| SV. 1,0 to 4,8 | 340 (35) | 30 | |
| «4,8» 11,5 | 310 (32) | 34 | |
| Semi-solid | From 0.8 to 11.5 | 360 (37) | 18 |
| Solid | From 0.8 to 1.0 | 690 — 880 (70 — 90) |
- |
| «1,2» 4,8 | 540 — 880 (55 — 90) |
- | |
| «4,8» 11,5 | 540 — 740 (55 — 75) |
- | |
At the request of the consumer semi-solid wire is manufactured with specified limits temporary resistance — 360 — 540 (37 — 55) MPa (kgf/mm2); solid wire diameters of 1.2 — 4.8 mm with more narrow limits of temporary resistance — 640 — 840 (65 — 85) MPa (kgf/mm2).
(Changed edition, Rev. No. 4).
2.6. Weight of wire on a reel provided in mandatory Appendix 2.
2.5, 2.6 (Revised edition, Edit. No. 3).
2.7. When raskladyvanii wire should not form cracks and to detect the disclosure of sunsets.
2.8. Excluded.
3. ACCEPTANCE RULES
3A.1. Wire take parties. The party must consist of one wire in precision manufacturing, one state, one diameter and decorated with a single document about quality that contains:
trademark or name of the manufacturer and trademark;
symbol wire;
the number and the weight of the batch;
the number of seats.
The weight of the batch should not exceed 1000 kg.
3A.2. Inspection appearance and dimensions shall be subjected to each coil of wire.
3A.3. To test a temporary resistance, relative elongation after rupture, rasklepyvajut and fracture should be selected two rolls from the party.
3A.4. To check the chemical composition to take two rolls. On the manufacturer is allowed to inspect the chemical composition of the samples taken from the molten metal.
3A.1 — 3A.4. (Changed edition, Rev. No. 3).
3A.5. If unsatisfactory test results of at least one indicator thereon, a second test of the doubled sample taken from the same batch.
The results of repeated tests apply to the entire party.
3. TEST METHODS
3.1. Inspection of the appearance of the wire is carried out without the use of magnifying devices.
Determination of the diameter of the wire is carried out in at least two places, in two mutually perpendicular directions with a micrometer according to GOST and GOST 6507−90 4381−87 or device, providing the appropriate precision.
3.2. For the tensile test taken one sample from each selected roll.
Selection and preparation of samples for tensile testing is carried out according to GOST 24047−80.
The tensile test is carried out according to GOST 10446−80.
3.3. Testing rasklepyvajut select one sample from each selected roll.
Test wire to rasklepyvajut carried out in a split fixture, clamped in the vise, the hole diameter in the fixture should be a wire with a diameter of 4.40 mm to 0.1 mm, and the wire from 4,40 mm and larger by 0.2 mm more than the nominal size of the wire.
The height of the protruding part of the specimen subjected to the test shall be two wire diameters. Raskladyvanii is carried out under pressure or by using a universal test machine, manual hammers to obtain a flat head with a height of not more than 0.5 of the nominal diameter of the wire.
3.4. To check break take one sample from both ends of each selected roll. Getting a break — according to GOST 1066−90.
The test fracture is carried out without the use of a magnifying device.
3.5. To determine the chemical composition of each selected coil cut on the same model.
Selection and preparation of samples for the determination of chemical composition is carried out according to GOST 24231−80 or other methods providing the required accuracy.
Determination of the chemical composition of the wire is carried out according to GOST 1652.1−77 — GOST 1652.13−77 and GOST 9716.1−79 — GOST 9716.3−79, 25086−81.
The differences in the evaluation of the chemical composition analysis of chemical composition is carried out according to GOST 1652.1−77 -GOST 1652.13−77.
3.1 — 3.5. (Changed edition, Rev. No. 3, 5).
4. PACKING, MARKING, TRANSPORTATION AND STORAGE
4.1. The wire is wound into skeins right, separatornyi rows, without sharp bends.
Each coil of wire shall consist of one segment.
Each coil of wire shall be tied with wires of diameter not less than 0.5 mm according to GOST 3282−74не less than two places evenly around the circumference of a coil with twisted wire at least three turns.
Rolls of barbed wire one of the party must be bound in the Bay. Each coil shall be securely tied with wires of diameter not less than 1 mm according to GOST 3282−74 in at least three places evenly around the circumference of the Bay with a strip of paper GOST 8273−75 in the field of dressing with a twist of wire at least five turns.
Allowed for ligation to use wire of diameter not less than 1.5 mm according to GOST 12920−67 without the use of strips of paper GOST 8273−75 in the field of ligation.
(Changed edition, Rev. No. 4).
4.2. For each ball or the Bay must be attached to plywood or metal label indicating:
the trademark or name and trademark of manufacturer;
legend wire;
batch number;
stamp of technical control.
4.3. Bay or coils of wire must be wrapped with non-woven fabric material according to normative-technical documentation, with the exception of linen or cotton fabric and tied with wire of diameter not less than 1 mm according to GOST 3282−74 in at least two places evenly around the circumference of a coil or Bay.
Bay or coils of wire intended for transportation in universal containers churchyard 20435−75 or GOST 22225−76, may be Packed in packaging materials.
In each container should be nested packing list specifying the information listed in clause 4.2, as well as gross mass and net.
Packaging of products intended for the far North and remote areas — according to GOST 15846−79. Group — metals and metal products.
4.4. Weight of cargo must not exceed 80 kg.
When mechanized loading and unloading in agreement with the consumer allowed the increased weight of the package, but not more than 1250 kg.
(Changed edition, Rev. No. 4).
4.5. The package needs to be formed into transport packets in accordance with trebovaniyami 24597−81. Packaging is carried out on pallets according to GOST 9078−84. Formation of packets allowed to exercise and without pallets with the use of wooden bars of size not less than 5050 mm. overpacks fasten the strapping in the longitudinal and transverse directions with wire of diameter not less than 3 mm the churchyard 3282−74 or tape not less than 0,230 mm according to GOST 3560−73 or using also packageable strop of wire with a diameter of not less than 5 mm according to GOST 3282−74. Binding: wire — stranding at least five turns of tape in the castle.
The weight of packages should not exceed 1250 kg.
(Changed edition, Rev. No. 4, 5).
4.6. Transportation of the wire is held by all kinds of transport in covered vehicles in accordance with cargo carriage regulations applicable to transport of this species.
4.1 — 4.6. (Changed edition, Rev. No. 3).
4.6. Transport marking — according to GOST 14192−77.
(Added, Rev. No. 3).
4.7. When storing the wire should be protected from mechanical damage, moisture and active chemical reagents.
Under specified storage conditions consumer properties of the wire do not change.
(Changed edition, Rev. No. 3, 5).
ANNEX 1
Recommended
The diameters of finished products
mm
| The diameter of the finished product | The wire diameter for | ||||
| bolts and screws | nuts | rivets | studs | screws | |
| 0,80 | 0,80 | ||||
| Of 1.00 | Of 1.00 | ||||
| 1,20 | 1,20 | ||||
| 1,25 | 1,25 | ||||
| 1,40 | 1,20 | 1,40 | |||
| 1,50 | - | - | 1,50 | - | |
| 1,60 | 1,32 | 1,60 | 1,45 | ||
| Of 2.00 | 1,70 | Of 2.00 | 1,80 | ||
| 2,40 | - | 2,40 | - | ||
| 2,50 | 2,20 | - | - | ||
| 2,50 | Of 2.16 | 2,50 | 2,35 | ||
| Of 3.00 | 2,60 | Of 3.00 | 2,64 | 2,85 (2,40) | |
| Of 3.00 | 5,00 | - | - | - | |
| 3,50 | - | 3,50 | 3,35 | ||
| 3,60 | - | 3,60 | - | ||
| Of 4.00 | 3,45 | 6,50 | - | - | |
| Of 4.00 | 3,48 | 5,28 | Of 4.00 | 3,50 | 3,85 (3,26) |
| Of 4.00 | 3,55 | - | - | - | - |
| 5,00 | 4,38 | 6,00 | 5,00 | 4,43 | 4,80 (4,10) |
| 6,00 | 5,20 | 8,30 | 6,00 | 5,28 | 5,80 |
| 7,00 | - | - | 7,00 | - | - |
| 8,00 | - | 11,50 | - | - | - |
| 8,00 | 7,10 | 9,60 | 8,00 | 7,10 | 7,80 |
| 9,00 | - | - | 9,00 | - | - |
| 10,00 | 8,85 | - | 10,00 | 8,85 | 9,80 |
| 12,00 | 10,50 | - | - | - | - |
Note. The diameters in parentheses is used for the manufacture of screws with thread up to head.
ANNEX 2
Mandatory
| Wire diameter, mm | Cut the roll weight, kg, not less | |
| normal | reduced | |
| From 0.80 to 1.60 | 5,0 | 3,0 |
| «1,70» 3,48 | 10,0 | 5,0 |
| «3,50» 11,50 | 20,0 | 10,0 |
Note. The number of coils of wire of low mass should not exceed 10% of the batch weight.
APPLICATIONS 1, 2. (Added, Rev. No. 3).
