Influence of heat treatment process on microstructure and mechanical properties of corrosion resistant 60Si2Mn spring steel for high-speed railway

doi:10.13251/j.issn.0254-6051.2022.08.022

Abstract

Abstract: Corrosion resistant 60Si2Mn spring steel was designed by adding Cr, Ni, Cu elements on the basis of the conventional high-speed railway 60Si2Mn spring steel. The influence of heat treatment process on microstructure and mechanical properties of the corrosion resistant spring steel was studied, and its corrosion resistance was evaluated. The results show that the microstructure of corrosion resistant 60Si2Mn steel after quenching and tempering is tempered troostite. When heated at 870 ℃ for 45 min, oil quenched and tempered at 440 ℃ for 60 min, the comprehensive mechanical properties of the corrosion resistant spring steel are the best, with yield strength of 1606 MPa, tensile strength of 1716 MPa, elongation after fracture of 5.3% and Rockwell hardness of 50.2 HRC. The corrosion resistance of 60Si2Mn steel added with corrosion resistant elements is much higher than that of conventional 60Si2Mn steel.

Key words: corrosion resistant 60Si2Mn spring steel, quenching temperature, tempering temperature, microstructure, properties

CLC Number:

TG115

Li Jinbo, Wu Hongyan, Gao Xiuhua, Chen Hongwei, Li Shaojie, Zhu Ziying, Du Linxiu. Influence of heat treatment process on microstructure and mechanical properties of corrosion resistant 60Si2Mn spring steel for high-speed railway[J]. Heat Treatment of Metals, 2022, 47(8): 135-140.

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