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Alloy 20 Socket Weld Pipe Flanges 8" 150# ANSI B16.5 Alloy 20 Ring Type Joint Flanges, ASME SB462 Specifications Standard : ASTM B462/ ASME SB462 Class : 150#, 300#, 600#, 900#, 1500#, 2500#, PN6, ...