Industry Information
Industry Information
2019-03-12 08:48:39
Wire diameter mm | Number of twists (not less than) | |
B, C level | Class D | |
≤2.00 | 20 | 18 |
>2.00-3.00 | 15 | 13 |
>3.00-4.00 | 12 | 8 |
>4.00-5.00 | 10 | 5 |
>5.00-6.00 | 8 | 3 |
Wire level | Wire diameter d mm | Mandrel diameter mm | Number of windings |
B, C level | ≤6.00 | d | ≥2 |
Class D | ≤4.00 | ||
>4.00 | 2d |
Pilot projects | Number of samples per batch | Testing method | Test requirements |
Tensile test | Disk-by-disk, double-ended | GBT228 | |
Torsion test | Disk-by-disk, double-ended | GBT239 | The spacing between the chucks is 100 times the diameter of the steel wire. When the gap between the chucks is greater than or less than 100 times the diameter of the steel wire, the number of twists increases or decreases in proportion to the gap between the chucks. In this case, the number of twists should be converted into 100 times the diameter of the steel wire. |
Bending test | One-by-one, one end | Both ends of the sample are oriented in different directions Along the circle of R = 10 mm One arc bent 90° | |
Winding test | 10%, no less than 3, one end | GBT2976 | |
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