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化学成分
Q345A:C≤0.20,Mn 1.0~1.6,Si≤0.55,P≤0.045,S≤0.045,V 0.02~0.15; Q345B:C≤0.20,Mn 1.0~1.6,Si≤0.55,P≤0.040,S≤0.040,V 0.02~0.15; Q345C:C≤0.20,Mn 1.0~1.6,Si≤0.55,P≤0.035,S≤0.035,V 0.02~0.15,Al≥0.015; Q345D:C≤0.20,Mn 1.0~1.6,Si≤0.55,P≤0.030,S≤0.030,V 0.02~0.15,Al≥0.015; Q345E:C≤0.20,Mn 1.0~1.6,Si≤0.55,P≤0.025,S≤0.025,V 0.02~0.15,Al≥0.015;