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ASTM A182 F304 F304L Forged Steel Flanges F.F. / R.F. And R.T. Face Type Weld Neck Flanges , ASTM A 105, ASTM A 181, ASTM A 182, GR F1, F11, F22, F5, F9, F91, A182 F 304, 304L, 304H, 316, 316L YUHONG ...