France · AFNOR NF
Z 8 CNDT 17-13 B
NF A49-214
Chemical composition
| Element | min | max | Similar | Remarks |
|---|---|---|---|---|
| B | 0.001 | 0.003 | ||
| C | 0.05 | 0.1 | ||
| Cr | 16 | 18 | ||
| Mn | 2 | |||
| Mo | 2 | 3 | ||
| P | 0.035 | |||
| S | 0.03 | |||
| Si | 1 | |||
| Ti | 0.75 | > 4 x C% | > 4 x C% |
Mechanical properties
| Heat treatment / condition | Yield strength | Tensile strength | Elongation | Reduction of area | Impact energy | Hardness |
|---|---|---|---|---|---|---|
| steel tubes, seamless steel tube, annealed | ≤195 | ≤540 | ≤40 | |||
| steel tubes, HB | 无缝钢管 退火 190 | |||||
| steel tubes, HR | 无缝钢管 退火 90 |