... .3-75mm Finish: POLISH,ACID,HL,200# polishing, 400 # polish precision tube 321 Stainless steel is a production which not easy rust ... ,321,409L, 904L, 410, 430,4Cr13.Tianjin development zone Ganghua Co.,Ltd which was established in 2006 had developed rapidly .At present ... ,316L,316LN,317,317L,309,309S,310,310S,430,409specificationRoundSquarerectangle precision tube 321