China · GB
ML35
GB/T 6478:2015 — Steels for cold heading and cold extruding
Chemical composition
| Element | min | max | Similar | Remarks |
|---|---|---|---|---|
| C | 0.33 | 0.38 | ||
| Mn | 0.6 | 0.9 | ||
| P | 0.025 | |||
| S | 0.025 | |||
| Si | 0.1 | 0.3 |
Mechanical properties
| Heat treatment / condition | Yield strength | Tensile strength | Elongation | Reduction of area | Impact energy | Hardness |
|---|---|---|---|---|---|---|
| steel products, quenched 870℃±5℃ | HR ≥28 距离淬火端部9mm | |||||
| steel products, hot rolled | ≥430 此数据仅供参考 | ≥630 此数据仅供参考 | ≥17 此数据仅供参考 | HB ≤187 此数据仅供参考 | ||
| steel products, annealed | ≤560 | ≥58 |
Heat treatment
| Type | 3 | 4 |
|---|---|---|
| Heat-treatment process | Normalized | AC3+30~50℃ |