France · AFNOR NF
20 NC 6
NF M 81-636
Chemical composition
| Element | min | max | Similar | Remarks |
|---|---|---|---|---|
| Al | 0.02 | |||
| C | 0.16 | 0.21 | ||
| Cr | 0.9 | 1.2 | ||
| Mn | 0.6 | 0.9 | ||
| Ni | 1.2 | 1.5 | ||
| P | 0.03 | |||
| S | 0.025 | |||
| Si | 0.1 | 0.35 |
Heat treatment
| Type | 1 |
|---|---|
| Heat-treatment curve | TTT |
| Heat-treatment curve | Hardness-Tempering |
| Heat-treatment curve | CCT |
| Heat-treatment curve | 淬透性 |