China · YB
18A
YB/T 679:1997 — YB/T 679
Chemical composition
| Element | min | max | Similar | Remarks |
|---|---|---|---|---|
| C | 0.15 | 0.22 | ||
| Cr | 0.3 | |||
| Cu | 0.25 | |||
| Mn | 0.35 | 0.65 | ||
| Ni | 0.3 | |||
| Si | 0.17 | 0.37 |
Mechanical properties
| Heat treatment / condition | Yield strength | Tensile strength | Elongation | Reduction of area | Impact energy | Hardness |
|---|---|---|---|---|---|---|
| steel tubes, annealed | ≤470 | ≥20 |