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details steel Yield Strength(MPa) standard Metallic element(%) C Mn Si P S Q235B 235 for thickness≦16mm GB/T709-2006 0.12-0.20 0.30-0.70 ≤0.30 ≤0.045 ≤0.045 Q345B 345 for thickness≦16mm GB/T1591-2008 ...