France · AFNOR NF
Z 25.20 C
NF A81-343
Chemical composition
| Element | min | max | Similar | Remarks |
|---|---|---|---|---|
| C | 0.25 | 0.45 | ||
| Cr | 24 | 28 | ||
| Mn | 2.5 | |||
| Ni | 18 | 22 | ||
| P | 0.03 | |||
| S | 0.03 | |||
| Si | 1 |
Mechanical properties
| Heat treatment / condition | Yield strength | Tensile strength | Elongation | Reduction of area | Impact energy | Hardness |
|---|---|---|---|---|---|---|
| steel bars | ≥450 | ≥650 | ≥10 Lo = 5 x d |