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Forged Flange Socket Weld Pipe Flanges 2 1/2 " #300 RTJ ASME B16.5 A182 F51(2205)S31803 Steel steel flanges Material Carbon steel ASTM A105. ASTM A350 LF1. LF2, CL1/CL2, A234, S235JRG2, P245GH P250GH, ...