France · AFNOR NF
Z 19.12.2 Nb
NF A81-343
Chemical composition
| Element | min | max | Similar | Remarks |
|---|---|---|---|---|
| C | 0.08 | |||
| Cr | 17 | 20 | ||
| Mn | 2.5 | |||
| Mo | 2 | 2.5 | ||
| Nb | 1 | > 6 x C% | > 6 x C% | |
| Ni | 11 | 14 | ||
| 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 | ≥25 Lo = 5 x d | ≥50 Charpy V Notch (+20°C) |