Heat Treatment of Metals ›› 2022, Vol. 47 ›› Issue (12): 152-157.DOI: 10.13251/j.issn.0254-6051.2022.12.026

• MATERIALS RESEARCH • Previous Articles     Next Articles

Effect of carbon and nitrogen content on quenching temperature and corrosion resistance of 4Cr16NiMo steel

Chu Baoshuai1,2, Chen Jianli2, Li Zhenjiang1, Li Yongtang1, Yang Wen1   

  1. 1. Shanxi Key Laboratory of Metal Forming Theory and Technology, School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan Shanxi 030024, China;
    2. Technology Center, Shanxi Taigang Stainless Steel Co. Ltd., Taiyuan Shanxi 030003, China
  • Received:2022-08-02 Revised:2022-10-21 Online:2022-12-25 Published:2023-01-05

Abstract: Effect of carbon and nitrogen content on microstructure, quenching temperature, hardness and pitting resistance of 4Cr16NiMo steel was analyzed by means of optical microscope and Rockwell hardness tester. The results show that with the increase of N content to 0.1%, the optimum quenching temperature of the 4Cr16NiMo steel decreases from 1070 ℃ without nitrogen to 1010 ℃, the microstructure is obviously refined and the maximum hardness is improved. At the same time, adding nitrogen can improve pitting resistance of the 4Cr16NiMo steel, and in a certain range, the higher the nitrogen content, the stronger the pitting resistance. On the basis of the same nitrogen content, the carbon content decreases by 0.1%, the hardness decreases, the quenched microstructure changes from cryptocrystalline martensite to lath martensite, and the pitting resistance is improved. Therefore, by controlling the carbon and nitrogen content, the quenching temperature of the 4Cr16NiMo steel can be effectively reduced, and its corrosion resistance can be improved.

Key words: 4Cr16NiMo steel, carbon and nitrogen content, quenching, microstructure, pitting corrosion

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