Heat treatment of type II clip for rail fastening system based on water-soluble quenching liquid

doi:10.13251/j.issn.0254-6051.2024.06.014

Abstract

Abstract: Usage characteristics of a water-soluble inorganic quenching liquid (quenchant) were introduced, and the type II clips made of 60Si2Cr spring steel were quenched by using of quenching liquid with a concentration of 11% at different temperatures and then tempered. The hardness and microstructure of the quenched clips, and the residual deformation, buckle pressure, hardness and fatigue property of the tempered clips were tested and analyzed in accordance with the requirements of the relevant standards. The results show that when the water-soluble inorganic quenching liquid is used as quenching medium, all the properties of the clips after heat treatment can meet the technical requirements, thus the quenching liquid can replace the traditional quenching oil as the quenching medium of the clips. The suitable heat treatment process for the clips is austenitized at 860 ℃ for 30 min, quenched in the water-soluble inorganic quenching liquid, and then tempered at 530 ℃ for 100 min with water cooling.

Key words: rail fastener clip, 60Si2Cr steel, water-soluble inorganic quenchant, quenching, tempering

CLC Number:

TG156.1

Yu Haoyong, Lü Mingkui, Fan Yanli, Liu Ruide. Heat treatment of type II clip for rail fastening system based on water-soluble quenching liquid[J]. Heat Treatment of Metals, 2024, 49(6): 91-95.

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