Certificate: TUV and ISO 9001 Material: 304.304L.316, 316L Size: DN15~~DN3600 good quality at most competitive price Stainless Steel Flange Material Carbon steelA234 WPB ,ST37.0 , 20# etc.Stainless steel304,304L,316,316L,A403,A312,1.4301,1.4306,1.4401,1.4571 etc.Alloy steelA234WP12,A234WP11,A234WP22,A234WP5,A234WP9,A335 P11,A335P22,A335 P5 ,A335P9 etc. Standard ASMEANSI B16.5 , ANSIB16. ...