Effect of heat treatment process on mechanical properties and corrosion resistance of 5Cr steel

doi:10.13251/j.issn.0254-6051.2021.11.032

Abstract

Abstract: Effect of heat treatment process on microstructure and mechanical properties of the 5Cr steel was studied by using optical microscopes, tensile and impact testing machines and other instruments. The corrosion process of 5Cr steel was simulated and the resistance of hot rolled and quenched + tempered steels was compared and analyzed by using high temperature and high pressure reactors and combing with electrochemical tests. The results show that after quenching and tempering treatment, the 5Cr steel has carbides dispersed and precipitated in the structure and has high strength and good plasticity and toughness. The corrosion rate of hot rolled steel is 0.188 mm/a, and that of quenched + tempered steel is 0.158 mm/a. In the quenched + tempered steel, the carbide (Fe₃C) as the cathode is less and uniformly dispersed, the self-corrosion potential is higher and the corrosion current density is lower of the structure, the degree of galvanic corrosion is shallow, and the corrosion resistance is better.

Key words: 5Cr steel, heat treatment, corrosion resistance, carbide, mechanical properties

CLC Number:

TG172.82

Liu Yong, Zhang Zhihui, Gao Yan, Zhao Jinbin, Wu Huibin. Effect of heat treatment process on mechanical properties and corrosion resistance of 5Cr steel[J]. Heat Treatment of Metals, 2021, 46(11): 186-190.

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