... pulled over a form until the steel is shaped into a hollow tube. The seamless pipe is then finished ... steel pipe, carbon steel pipe and so on.Steel sheetmaterialDC01,SPCC,ST12,HJ58,HG60,DB685,16Mn,20G,65Mn,510l,ASTMA299,ASTMA515,ASTM A 572,ASTM ... steel barstandardASTM,GBmaterial201,202,301,304,316,316L,316LN,317,317L,309,309S,310,310S,430,409specificationRoundSquarerectangle 304l stainless steel tube