1.4462 heavy hex nut ASME B18.2.2 duplex hex nut
Duplex steels have higher toughness and better weldability. This is how alloy steel is used for industrially available pressure vessels.
Duplex steel fasteners are developed from austenitic grade alloyed duplex steels. This is why alloy steel fasteners have many properties. At the same time, the dual phase steel F51 machine nuts have high thermal and electrical conductivity, low vapor pressure and low gas content. Duplex Steel F52 Cap Nuts are used in a variety of processing equipment, especially to maintain product purity when handling food, synthetic fibers and alkalis. The carbon content of UNS S31803 Duplex Steel Hex Nuts is limited to exclude the lower end of the range, making it the grade of choice for high temperature applications.