... 2ASME/ANSI,DIN,JIS 3CCS or BVcertificates 4Durability,advanced technologyMaterial: carbon steel: A234 WPB, Q235, A105, alloy steel:API5L X60 ... STD, SCH40, SCH60, XS, SCH80, SCH100, SCH120, SCH160, XXS .Type: carbon steel flange, alloy steel flange, high pressure flange, slip on ... Application range: petroleum, oil, chemical industry, electric power, gas, construction and so on carbon steel blind flange