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The substitution of nitrogen for carbon distinctly improves the corrosion resistance of martensitic stainless steels with about 15% chromium and 1% molybdenum. In addition, this property becomes more stable with respect to tempering. Together with a raise in secondary hardening, the new high-nitrogen steels combine improved hot hardness and corrosion resistance for service at elevated temperatures. The new steels show better mechanical properties and bearing life as compared to conventional stainless bearing steels. Pressurized electroslag remelting allows for partial substitution of nitrogen for carbon. A full substitution is possible by powder metallurgy. Further investigations are in process.
bearing steel, high-nitrogen steel, stainless steel
Senior professor, Ruhr-Universität Bochum, Institut fuer Werkstoffe, Lehrstuhl Werkstoffechnik, Bochum,
FAG Kugelfischer Georg Schäfer, Schweinfurt,