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WN RF Flanges DN300 ANSI B16.5 ASTM A182 F44 TUV / DNV / BIS / API / PED MATERIAL OF FLANGE TUBESHEET Duplex stainless steel ASTM A182 F51 F53 F55 F60 F44 UNS S31803 S32750 S32760 S32205 S31254 2507 ...