无缝方管主要材质:
20 #:C :0.17%~0.2% Si:0.17%~0.37% Mn:0.35%~0.65% S :≤0.035% P :≤0.035% Cr:≤0.25% Ni:≤0.25% Cu:≤0.25%
Q235B:C :0.14~0.22 Si:≤0.30 Mn:0.30~0.65 S :≤0.050 P :≤0.045
Q34**: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;
Q34**、B、C、D、E均含Nb≤0.07,V≤0.15,Ti≤0.20,Cr≤0.30,N≤0.012,Mo≤0.10。
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