德标ST52无缝管是什么材质|st52是什么钢 | |
st52相当于Q345B,或者16mn 化学成分如下: Chemical compositionC <=0.20 Si <=0.55 Mn <=1.60 P <=0.030 S <=0.030 Cu <=0.55 N <=0.012 Material Number 1.0553 网站;http;//www.czlggsjf.cn 邮箱;sunjinfang001@163.com qq;872545931 qq;1226316719手机;13283219722 msn;sjfwhj@hotmail.com <br |