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1/2"-120" (DN15-DN3000) ASTM B564 SB564 ANSI B16.5 Alloy 20 N08020 NiCr20CuMo Socket Weld Flanges ASTM/ASME/ANSIB16.5, B16.47, ASME/ANSI B16.48 flange slip on flange, Weld Neck Flange ,Threaded Flange ...