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    無縫方管的各種材質

    無縫方管的各種材質 Q345A:C≤0.20,Mn ≤1.70,Si≤0.50,P≤0.035,S≤0.035;Q345B:C≤0.20,Mn ≤1.70,Si≤0.50,P≤0.035,S≤0.035;Q345C:C≤0.20,Mn ≤1.70,Si≤0.50,P≤0.030,S≤0.030,Al≥0.015;Q345D:C≤0.18,Mn ≤1.70,Si≤0.50,P≤0.030,S≤0.025,Al≥0.015;Q345E:C≤0.18,Mn ≤1.70,Si≤0.50,P≤0.025,S≤0.020,Al≥0.015;Q345A、B、C、D、E均含Nb≤0.07,V≤0.15,Ti≤0.20,Cr≤0.30,N≤0.012,Mo≤0.10。20#、Q235B