西安低合金规格理论重量表西安低合金规格理论重量表西安低合金规格理论重量表
西安低合金规格理论重量表西安Q345A方管:C≤0.20,Mn ≤1.70,Si≤0.50,P≤0.035,S≤0.035; 西安Q345B方管:C≤0.20,Mn ≤1.70,Si≤0.50,P≤0.035,S≤0.035; 西安Q345C方管:C≤0.20,Mn ≤1.70,Si≤0.50,P≤0.030,S≤0.030,Al≥0.015; 西安Q345D方管:C≤0.18,Mn ≤1.70,Si≤0.50,P≤0.030,S≤0.025,Al≥0.015; 西安Q345E方管:C≤0.18,Mn ≤1.70,Si≤0.50,P≤0.025,S≤0.020,Al≥0.015; 西安Q345A方管、B、C、D、E均含Nb≤0.07,V≤0.15,Ti≤0.20,Cr≤0.30,N≤0.012,Mo≤0.10。 西安20#方管、西安Q235B方管