China · Baosteel Q/BQB
StE355
Q/BQB 303:2009 — Q/BQB 303
Chemical composition
| Element | min | max | Similar | Remarks |
|---|---|---|---|---|
| Al | 0.02 | |||
| C | 0.2 | |||
| Mn | 0.9 | 1.65 | ||
| N | 0.015 | |||
| Nb+V+Ti | 0.22 | |||
| P | 0.03 | |||
| S | 0.025 | |||
| Si | 0.5 |
Mechanical properties
| Heat treatment / condition | Yield strength | Tensile strength | Elongation | Reduction of area | Impact energy | Hardness |
|---|---|---|---|---|---|---|
| plates, strip, hot rolled or controlled rolled | ≥355 | 490–630 | ≥22 | ≥21；≥24；≥31 |