the carbon steel tee has passed the certificate of ISO 9002 and PED Features :carbon steel flange Material :carbon steel Size:1/2-48(DN15-DN600) Standard:ANSI,ASTM,MSS,JIS,DIN,EN TypeflangeMaterial:CarbonSteelA234,ST35.8,ST37 A105, A106B, alloy steeStandard:ASME,ASTM,ANSI,DIN,GB,B16.9,JIS NominalDiameterDN15~DN600WallThicknessSCH20,SCH40,SCH80,XS,STDSize:1/2"-42"Certificate:ISO9002 and PED. ...