France · AFNOR NF
Z 20.25.5 L Cu
NF A81-343
Chemical composition
| Element | min | max | Similar | Remarks |
|---|---|---|---|---|
| C | 0.04 | |||
| Cr | 19 | 22 | ||
| Mn | 2.5 | |||
| Mo | 4 | 6 | ||
| Ni | 24 | 26 | ||
| P | 0.03 | |||
| S | 0.03 | |||
| Si | 0.9 |
Mechanical properties
| Heat treatment / condition | Yield strength | Tensile strength | Elongation | Reduction of area | Impact energy | Hardness |
|---|---|---|---|---|---|---|
| steel bars | ≥320 | ≥510 | ≥25 Lo = 5 x d |