... steel tube seamless weled OD:6mm-750mm T:0.3-75mm Finish: POLISH,ACID,HL,200# polishing, 400 # polishing 316L stainless steel tubeStainless steel ... steel pipeWelded steel pipeSurface treatmentPolishing or notThe stainless steel barstandardASTM ... ,GBmaterial201,202,301,304,316,316L,316LN,317,317L,309,309S,310,310S,430,409specificationRoundSquarerectangle 316L stainless steel tube ...