China · GB
ML30
GB/T 5953:1999 — Steel wires for cold heading
Chemical composition
| Element | min | max | Similar | Remarks |
|---|---|---|---|---|
| C | 0.27 | 0.35 | ||
| Cr | 0.2 | |||
| Cu | 0.2 | |||
| Mn | 0.6 | |||
| P | 0.035 | |||
| S | 0.035 | |||
| Si | 0.2 |
Mechanical properties
| Heat treatment / condition | Yield strength | Tensile strength | Elongation | Reduction of area | Impact energy | Hardness |
|---|---|---|---|---|---|---|
| Wires, cold drawn | 590–735 | ≥35 | ||||
| steel wire, cold drawn | 590–735；490–685 | ≥35；≥40 |