France · AFNOR NF
18 MND 5
NF A36-210
Chemical composition
| Element | min | max | Similar | Remarks |
|---|---|---|---|---|
| C | 0.2 | |||
| Cr | 0.25 | |||
| Mn | 1.15 | 1.6 | ||
| Mo | 0.45 | 0.55 | ||
| Ni | 0.5 | 0.8 | ||
| P | 0.015 | |||
| S | 0.012 | |||
| Si | 0.1 | 0.3 | ||
| V | 0.03 |
Mechanical properties
| Heat treatment / condition | Yield strength | Tensile strength | Elongation | Reduction of area | Impact energy | Hardness |
|---|---|---|---|---|---|---|
| Plates, quenched and tempered | ≥450 | 600–700 | ≥18 | ≥56 Charpy V Notch (-20°C);Corresponds with 27J at -30℃ |
High/low temperature
| Condition | Temperature ℃ | min | Remarks |
|---|---|---|---|
| Plates quenched and tempered | -20 | 56 | Charpy V Notch |