China · GB
ML35
GB/T 6478:2001 — Steels for cold heading and cold extruding
Chemical composition
| Element | min | max | Similar | Remarks |
|---|---|---|---|---|
| C | 0.32 | 0.39 | ||
| Cr | 0.2 | |||
| Cu | 0.2 | |||
| Mn | 0.3 | 0.6 | ||
| Ni | 0.2 | |||
| 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 |
|---|---|---|---|---|---|---|
| steel bars, wire, Heat treated | ≤315 | ≤530 | ≤20 | ≤45 | ||
| steel bars, HB | 线材 Heat treated 187 |
Heat treatment
| Type | 3 | 4 |
|---|---|---|
| Heat-treatment process | Normalized | AC3+30℃~50℃ |