... 3CCS or BVcertificates 4Durability carbon seel blind flange 1carbon steel,alloy steel 2ASME/ANSI,DIN,JIS 3CCS or ... advanced technologyMaterial: carbon steel: A234 WPB, Q235, A105, alloy steel:API5L X60,X70,16Mn, P11, P9, T5, ... steel flange, alloy steel flange, high pressure flange, slip on flange, slip on welding flange, welding ( welded )neck flange, blind flange, orifice flange, welding plate flange, ...