德标ST52无缝管是什么材质/国标16Mn无缝钢管价格
st52相当于Q345B,或者16mn
化学成分如下:
C <=0.20 Si <=0.55 Mn <=1.60 P <=0.030 S <=0.030 Cu <=0.55 N <=0.012国标16Mn无缝钢管价格电议:0510-88268136