France · AFNOR NF
20 NC 6
NF A37-504
Chemical composition
| Element | min | max | Similar | Remarks |
|---|---|---|---|---|
| C | 0.16 | 0.21 | ||
| Cr | 0.9 | 1.2 | ||
| Mn | 0.6 | 0.9 | ||
| Ni | 1.2 | 1.5 | ||
| P | 0.035 | |||
| S | 0.025 | |||
| Si | 0.1 | 0.4 |
Mechanical properties
| Heat treatment / condition | Yield strength | Tensile strength | Elongation | Reduction of area | Impact energy | Hardness |
|---|---|---|---|---|---|---|
| bars, steel strip, quenched and tempered, > 0.5 <= 3 mm, coil | 950 | |||||
| bars, steel strip, annealed, > 0.5 <= 3 mm, coil | 580.00 | 22 | ||||
| bars, steel strip, annealed, > 0.5 <= 3 mm, HR | 卷板 88.00 |
Heat treatment
| Type | 1 |
|---|---|
| Heat-treatment curve | TTT |
| Heat-treatment curve | Hardness-Tempering |
| Heat-treatment curve | CCT |
| Heat-treatment curve | 淬透性 |