Asme B16.5 Stainless Steel Gost12821-80 Pn16 Welding Neck Pipe High Hub Blind Flange
ASTM A182 F51 Flange is made up of a duplex steel material. The material has both ferritic and austenitic qualities in the metallurgic microstructure. The tensile strength of the material is 620MPa and the minimum yield strength is 450MPa.
The ASTM A182 F51 flanges refer to standard or non-standard flanges manufactured in accordance with ASTM A182 Grade F51, which is designated with UNS number S31803. The A182 Gr. F51 / S31803 material is a typical duplex stainless steel, which contains approximately 50% ferrite and 50% austenite. The combination of the ferritic phase and austenitic phase provides both high strength and excellent corrosion resistance. It also provides improved formability and weldbility not obtained in any one of the usual stainless steels.