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B16.9 F321 CLASS150 WN RF SQUARE PIPE FLANGES STAINLESS STEEL FORGING 1. Material:SS 304 SS316 Q235,S235JRG2,C22.8,SS400,A105 2. Pressure:150#,300#.600#. 3.Size:1/2"-80" #/* B16.9 F321 CLASS150 WN RF ...