High nitrogen nickelfree austenitic stainless steels have wide application prospect in many fields. However, the effects of the nitrogen mass fraction on physical and chemical properties are still unclear yet. High nitrogen nickelfree austenitic stainless steels with nitrogen mass fraction ranging from 0.02% to 1.20% were designed and melted. The lattice constant, thermal expansion coefficient, resistivity, sweat corrosion resistance, and selfcorrosion potential were examined and analyzed. The results showed that the lattice constant increased with the nitrogen mass fraction linearly and the quantitative relationship between them was obtained. The higher the nitrogen mass fraction, the larger were both the thermal expansion coefficient and resistivity. After the corrosion by artificial sweat for 720 h, the steels with 0.02% and 1.20% nitrogen were corroded seriously. However, other steels were noncorroded. The selfcorrosion potential increased with the nitrogen mass fraction and the maximum appeared when the nitrogen mass fraction was 1.05% in steel. The selfcorrosion potential of the steel with the nitrogen mass fraction of 1.20% decreased to a lower level as that of the steel with the nitrogen mass fraction of 0.60%.
宁小智,邢长军,雍歧龙,翁建寅. 氮含量对无镍奥氏体不锈钢理化性能的影响[J]. 中国冶金, 2019, 29(6): 34-37.
NING Xiaozhi,XING Changjun,YONG Qilong,WENG Jianyin. Effects of nitrogen content on physical and chemical properties of nickelfree austenitic stainless steels[J]. China Metallurgy, 2019, 29(6): 34-37.