304 seamless tube seamless / weled tube OD:6mm-750mm T:0.3-75mm Finish: POLISH,ACID, ... , Iran, and so on.Steel pipematerialGB10#,20#,45#,20G.16Mn,27SiMn,15CrMoG,12Cr1MoU,20CrMo,35CrMo, 42CrMo, 12Cr1MoVG,Cr5Mo,WB36,BCrMo44,34CrMo4 ... ,317,317L,309,309S,310,310S,430,409specificationRoundSquarerectangle 304 seamless tube