China · Baosteel Q/BQB
SM400A
Q/BQB 303:2009 — Q/BQB 303
Chemical composition
| Element | min | max | Similar | Remarks |
|---|---|---|---|---|
| C | 0.23 | |||
| Mn | 2.5 | |||
| P | 0.035 | |||
| S | 0.035 | |||
| Si | 0.35 |
Mechanical properties
| Heat treatment / condition | Yield strength | Tensile strength | Elongation | Reduction of area | Impact energy | Hardness |
|---|---|---|---|---|---|---|
| plates, strip;5 < t < 16mm, hot rolled or controlled rolled | ≥18 | |||||
| plates, strip;t ≤ 16mm, hot rolled or controlled rolled | ≥245 | ≥22 | ||||
| plates, strip;t ≤ 5mm, hot rolled or controlled rolled | ≥23 | |||||
| plates, strip;t > 16mm, hot rolled or controlled rolled | ≥235 | |||||
| plates, strip, hot rolled or controlled rolled | 400–510 | ≥27 |