... , standard : BS .JIS. DIN . ASTM . GB . 2 steel grade : 10# . 20# . .45#.Q345,16Mn. 3,outer ... and mechanical structure If you want to import the steel tube from china, pls inform us the ... from you soon. Thanks & best regardsLiaocheng Tianrui Steel Tube Co.,LTDwww.lchzgg.comAlso pls dial me ... or call asap! Address: No.14,District2,Dadong Steel Pipe Market, Development Zone,liaocheng, shandong, china ...