SPRING STEEL CARBON WIRE
GOST 9389-75
Wire in accordance with GOST 9389-75 is used for the manufacture of springs wound in a cold state and not subjected to hardening.
Spring wire is produced:
mechanical properties:
-
grades A, B and C
-
classes 1, 2 and 3
manufacturing accuracy:
-
normal
-
elevated
There should be no cracks, captivity, sunsets, hairlines and rust on the surface of the wire.
The maximum deviation in thickness and ovality should not exceed that specified in the table in accordance with GOST 9389-75 .
|
Nominal diameter, mm |
Limit deviations, mm |
ovality |
|
0.30 |
+0.02 –0.015 |
Should not exceed half of the diameter tolerance |
|
0.32-1.90 |
±0.020 |
|
|
2.00-3.60 |
±0.030 |
|
|
4.00-5.60 |
±0.040 |
|
|
6.00-8.00 |
±0.050 |
The value of the run-up of temporary tensile strength in coils (coils) weighing up to 250 kg of grades B of classes 1, 2 according to GOST 9389-75 should be no more than 100 N / m 2 (10 kgf / mm 2); grade B class 3 and grade C of all classes for wire with a diameter of 1.6 mm and less in accordance with GOST 9389-75 - 200 N / mm 2 (20 kgf / mm 2), and for wire with a diameter of more than 1.6 mm -150 N / mm 2 (15 kgf / mm 2).
The value of the run-up of the temporary resistance to rupture of wire in coils (coils) weighing more than 250 kg must comply with the requirements of GOST 9389-75 . The values are shown in the table.
|
Wire diameter, mm |
Tensile strength, N / mm 2 (kgf / mm 2) |
Run-up of tensile strength, no more than, N/mm 2 (kgf/mm 2 ) |
Number of twists, not less |
||||||
|
Grade 2 |
3rd grade |
Mark B |
Grade B |
Mark B |
Grade B |
||||
|
Class |
Class |
||||||||
|
2.3 |
2 |
3 |
2 |
3 |
2 |
3 |
|||
|
0.14 |
2300-2740 (235-280) |
1810-2300 (185-235) |
300(31) |
440(45) |
490 (50) |
35 |
35 |
35 |
35 |
|
0.5 |
2160-2600 (220-265) |
1670-2160 (170-220) |
260(27) |
440 (45) |
490 (50) |
twenty |
twenty |
19 |
19 |
|
0.7 |
2160-2550 (220-260) |
1670-2160 (170-220) |
240(24) |
440 (45) |
490 (50) |
twenty |
twenty |
eighteen |
eighteen |
|
0.8 |
2110-2550 (215-260) |
1670-2110 (170-215) |
230 (23) |
440 (45) |
490 (50) |
twenty |
twenty |
17 |
17 |
|
0.9 |
2110-2500 (215-255) |
1620-2110 (165-215) |
230 (23) |
390 (40) |
490 (50) |
twenty |
twenty |
17 |
17 |
|
1.0 |
2060-2450 (210-250) |
1570-2060 (160-210) |
220 (22) |
390 (40) |
490 (50) |
twenty |
twenty |
17 |
17 |
|
1.10 |
2010-2400 (205-245) |
1520-2010 (155-205) |
220 (22) |
390 (40) |
490 (50) |
twenty |
twenty |
17 |
17 |
|
1.20 |
1960-2350 (200-240) |
1520-1960 (155-200) |
210 (21) |
390 (40) |
440 (45) |
twenty |
twenty |
17 |
17 |
|
1.30 |
1960-2300 (200-235) |
1520-1960 (155-200) |
210 (21) |
340 (35) |
440 (45) |
twenty |
twenty |
17 |
17 |
|
4.20 |
1420-1670 (145-170) |
1130-1420 (115-145) |
200 (20) |
250 (25) |
290 (30) |
15 |
15 |
12 |
12 |
|
4.50 |
1370-1620 (140-165) |
1130-1370 (115-140) |
200 (20) |
250 (25) |
250 (25) |
15 |
15 |
12 |
12 |
|
5.00 |
1370-1620 (140-165) |
1130-1370 (115-140) |
200 (20) |
250 (25) |
250 (25) |
15 |
15 |
nine |
nine |
|
5.60 |
1320-1570 (135-160) |
1080-1320 (110-135) |
200 (20) |
250 (25) |
250 (25) |
15 |
15 |
6 |
6 |
|
6.00 |
1320-1570 (135-160) |
1080-1320 (110-135) |
200 (20) |
250 (25) |
250 (25) |
15 |
15 |
4 |
4 |
|
6.50 |
1230-1420 (125-145) |
1030-1230 (105-125) |
200 (20) |
200 (20) |
200 (20) |
- |
- |
- |
- |
|
7.00 |
1230-1420 (125-145) |
1030-1230 (105-125) |
200 (20) |
200 (20) |
200 (20) |
- |
- |
- |
- |
|
8.00 |
1230-1420 (125-145) |
1030-1230 (105-125) |
200 (20) |
200 (20) |
200 (20) |
- |
- |
- |
- |
If, according to GOST 9389-75 , when determining the tensile strength at the ends of the coil, the test results belong to two classes, then the coil belongs to one of the classes according to the lower value. At the same time, the higher value according to GOST 9389-75 should not exceed the upper limit of the normalized tensile strength for the class to which the coil belongs, by more than 50 (5) N / mm 2 (kgf / mm 2). This note is not taken into account if the wire belongs to grades A and B of class 2A of all diameters and class 2 of diameter 2.5 mm or more.
At the request of the furniture industry, wire with a diameter of 2.2 mm, increasedaccuracy, grade B, is manufactured with a tensile strength of 1570-1770-N / mm 2 (160-180 kgf / mm 2).