304 seamless tube seamless / weled tube OD:6mm-750mm T:0.3-75mm Finish: POLISH,ACID, ... treatment2B,BA,8K,No.1,Etching,Hairline,Satin,Mirror,Vibration,Bead Blast,EmbossedThe stainless steel pipestandardASTM,GBmaterial201,202,301,304,316 ... ,317,317L,309,309S,310,310S,430,409specificationRoundSquarerectangle 304 seamless tube