... Finish: POLISH,ACID,HL,200# polishing, 400 # polish precision tube 321 Stainless steel is a production which not easy rust,acid ... , 309 309S 310, 310S,304,304L, 316, 316L,317, 317L,321,409L, 904L, 410, 430,4Cr13.Tianjin development zone Ganghua Co ... ,317,317L,309,309S,310,310S,430,409specificationRoundSquarerectangle precision tube 321