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Chinese steel Grade strong intensity alloy steel Q345B(Gr50), the executive standard is GB/T1591-94 of Chinese. The mechanical properties and chemic element is following:
Welding Photos :
| Yield point，σs MPa | Tensile strength σb MPa |
Extend rate δs, |
Work of concussion，Akv, (vertical)， J | 180obending test d= dia. a= thickness（dia.） |
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| thickness（dia.，side length），mm | +20℃ | 0℃ | -20℃ | -40℃ | |||||||||
| ≤16 | ＞16~35 | ＞35~50 | ＞50~100 | Not less than | thickness（dia., mm） | ||||||||
| Not less than | ≤15 | ＞16~100 | |||||||||||
| 345 | 325 | 295 | 275 | 470~630 | 21 | 34 | d=2a | d=3a | |||||
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