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6" #1500 ASTM B564 SB564 ANSI B16.5 Alloy 20 N08020 NiCr20CuMo Socket Weld Flanges Alloy 20 Flanges Specification : Specifications : ASTM /ASME B564/SB 564 Dimensions : ANSI/ASME B16.5, B 16.47 Series ...