Abstract:Mn18Cr18N steel plate with nitrogen mass fraction of 0.59% was obtained by pressurized metallurgy and controlled rolling technology. The effects of finish rolling temperature on microstructure and mechanical properties of high nitrogen austenitic steel were investigated. After recrystallization zone rolling and finish rolling at 970 ℃, the steel plates consisted of equiaxed austenite and some twins, with lower strength, higher ductility and impact toughness. After finish rolling at 910 ℃, the steel plates consisted of most deformed austenite and some recrystallization grains. The strength increased, the ductility and the impact toughness decreased with the decrease of finish rolling temperature. After non-recrystallization zone rolling and finish rolling at 780 ℃, the steel plates consisted of severe deformed austenite, with the highest strength, the lowest ductility and impact toughness. The precipitation Cr2N formed along grain boundary which could be found in all plates. The quantity of precipitation Cr2N increased with the decrease of finish rolling temperature and cooling rate after rolling.
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