... ,HL,200# polishing, 400 # polish precision tube 321 Stainless steel is a production which not easy rust, ... corrosion resistance, so it is widely used in light industry,heavy industry,daily necessities and the decoration industry ... 310, 310S,304,304L, 316, 316L,317, 317L,321,409L, 904L, 410, 430,4Cr13.Tianjin development zone Ganghua ... ,310,310S,430,409specificationRoundSquarerectangle precision tube 321