France · AFNOR NF
Z 18.8 Mn
NF A81-343
Chemical composition
| Element | min | max | Similar | Remarks |
|---|---|---|---|---|
| C | 0.2 | |||
| Cr | 17 | 20 | ||
| Mn | 5 | 7 | ||
| Ni | 7 | 9 | ||
| 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 | ≥350 | ≥550 | ≥30 Lo = 5 x d | ≥50 Charpy V Notch (+20°C) |