1.Item:304 stainless steel flange 2.Standard:ASTM,ASME,DIN,BS,DIN 3.Size:1/2''~50'' 4.Type:SO,IF,TH,WN,SW ... .25-PN42.0 Stainless Steel StandardGB/T9112-2000, ANSI B16.5,ASME SA403,DIN2573 Material304,304L,316,316L,309S,321,347H,201 ... ,etcCarbon SteelStandardASTM A105,ASTM A234,A694Material20#,Q235,Q345,16Mn,A36,ST52,ST35.8Alloy Steel StandardASTM ...