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Welding Neck Flange,RJ,Class1500,4",Sch80s,ASTMA182 F51 UNS S31803,Sour,ASMEB16.5 Two-Way Stainless Steel Flange A182 F51 is a duplex stainless steel composed of 21% chromium, 2.5% molybdenum and 4.5% ...