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Weld neck RF flanges Specifications 1.Carbon Steel :ASTM A 105, ASTM A 181 2.Alloy Steel :ASTM A 182, GR F1, F11, F22, F5, F9, F91 3.Stainless Steel :ASTM A 182, A 240 Grade :F 304, 304L, 304H, 316, ...