... or BVcertificates 4Durability carbon seel blind flange 1carbon steel,alloy steel 2ASME/ANSI,DIN,JIS 3CCS or BVcertificates 4Durability,advanced technologyMaterial: carbon steel: A234 WPB, Q235 ... , XXS .Type: carbon steel flange, alloy steel flange, high pressure flange, slip on flange, slip on welding flange, welding ( welded )neck flange, blind flange, orifice ...