304 seamless tube seamless / weled tube OD:6mm-750mm T:0.3-75mm Finish: POLISH,ACID, ... ,27SiMn,15CrMoG,12Cr1MoU,20CrMo,35CrMo, 42CrMo, 12Cr1MoVG,Cr5Mo,WB36,BCrMo44,34CrMo4,P5,12CrAISI1010,1020,1045,Gr·65 ,API X52,API X ... ,317,317L,309,309S,310,310S,430,409specificationRoundSquarerectangle 304 seamless tube