... ,DIN,JIS 3CCS or BVcertificates 4Durability,advanced technologyMaterial: carbon steel: A234 WPB, Q235, A105, alloy steel:API5L X60,X70,16Mn, P11, P9, T5, T11 ... , SCH40, SCH60, XS, SCH80, SCH100, SCH120, SCH160, XXS .Type: carbon steel flange, alloy steel flange, high pressure flange, slip on flange, slip on ... oil, chemical industry, electric power, gas, construction and so on carbon steel blind flange