The classic series of duplex stainless steels shows very high corrosion resistance and can be used for very demanding applications. A new lean duplex steel, LDX 2101® (EN 1.4162, UNS S32101), has been developed with corrosion resistance on a par with standard austenitic grades. Application areas include: structural components, chemical industry, tanks and containers. The steel was designed to have equal amounts of ferrite and austenite in annealed condition and with an austenite that is stable against strain‐induced martensite. Thanks to its high nitrogen content, the steel has a fast austenite reformation when subjected to thermal cycling, e.g. welding. Unlike conventional duplex grades, the formation of intermetallic phase is very sluggish, although precipitation of nitrides and carbides has a certain impact on material properties after exposure in the temperature range 600 to 800°C. The precipitation behaviour after different isothermal treatments is described and its influence on different product properties is shown. A good agreement was found between impact toughness and corrosion resistance for a wide range of thermal treatments.
The present experimental and theoretical study investigates the effect of nickel on the phase balance and resulting properties of a 22Cr duplex stainless steel. The decrease in nickel was balanced by nitrogen and manganese additions. It was found that a minimum nickel content was required to maintain mechanical and corrosion properties at technically relevant levels. The influence of increasing nitrogen content on resulting phase composition and properties is discussed.
The properties of a ncw, very highly alloyed stainless steel, Avesta 654 SMO, are compared with those of other stainless steels and nickel-base alloys. The new steel has a very high strength but still possesses a high elongation. The corrosion properties have been investigated in accelerated laboratory tests and in environments representing the expected main application areas, sea water, pulp bleaching and flue gas cleaning.The tests clearly show that the new steel has appreciably better corrosion resistance than the superduplex and superaustenitic 6 Mo steels and that the resistance in many cases matches that of the best nickel-base alloys.Die Eigenschaften eines neuen sehr hochlegierten nichtrostenden Stahls (AVESTA 654 SMO) werden rnit denen anderer nichtrostender Stahle sowie von Nickellegierungen verglichcn. Der neue Stahl hat trotz seiner hohen Festigkeit eine hohe Dehnung. Die Korrosionseigenschaften wurden in bcschleunigten Laborversuchen sowie in Medien untersucht, die fur die erwarteten hauptsachlichen Anwendungen reprasentativ sind (Meerwasser, Zellstoffbleiche und Rauchgasreinigung). Die Ergebnisse der Versuche zeigen deutlich, daB der neue Stahl den Superduplexstihlen und den superaustenitischen Stahlen mit 6% Molybdan hinsichtlich Korrosionsbestandigkeit deutlich iiberlegen und darin vielfach den besten Nickellegierungen gleichwertig ist.
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