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Alloy 20 Flange,ASTM B462 UNS N08020 FlangeSlip On Pipe Flanges Size 2'-24' ASME B16.5 1. Alloy 20 ASME B16.5 ASME B16.47 BS3293 producing standard ASME/ANSI B 16.5 Welding Neck Flange, Slip on Flange...