... and resonable price size:DN15-DN600 certificate:ISO900 Specificationscarbon steel flange with high quality and resonable price size:DN15-DN600 certificate ... ,ST37 A105, A106B, alloy steelStandard:ASME,ASTM,ANSI,DIN,GB,B16.9,JISNominalDiameterDN15~DN600WallThicknessSCH20,SCH40,SCH80,XS,STDSize:1/2"-42 ...