屈服强度
Q235B/235-260MPa Q345B/335-360MPa
伸长率
Q235B/26min Q345B/26min
碳含量
Q235B/C(0.12-0.20)% Q345B/C(0.12-0.20)%
锰含量
Q235B/Mn(0.45)% Q345B/Mn(1.35)%
硅含量
Q235B/Si(≥ 0.19)% Q345B/Si(≥ 0.002)%
磷含量
Q235B/P(0.03)% Q345B/P(0.012)%
硫含量
Q235B/S(0.02)% Q345B/S(0.013)%