德標ST52無縫管是什么材質(zhì)/國標16Mn無縫鋼管價格
st52相當于Q345B,或者16mn
化學成分如下:
C <=0.20 Si <=0.55 Mn <=1.60 P <=0.030 S <=0.030 Cu <=0.55 N <=0.012國標16Mn無縫鋼管價格電議:0510-88268136