Pilot-scale study of water-air alternative timed quenching technology for U20Mn steel rail

doi:10.13251/j.issn.0254-6051.2020.09.008

Abstract

Abstract: In order to improve the mechanical properties of heavy-load rail,this study attempts to replace the traditional air-cooling or fogcooling processes with water-air alternating controlled quenching (ATQ),and carries out a pilot-scale study of the ATQ technology (process+equipment) for U20Mn steel rail with water spray quenching.Firstly,the problem of rail operation obstruction caused by distortion is solved through the improvement of equipment and technology and finite element simulation of the distortion,then two ATQ processes were studied in laboratory to obtain different relative quantities of martensite and bainite respectively.Finally,the bainite-dominated ATQ process was selected to carry out the pilot-scale production for 7 m long steel rail,and the results show that the mechanical properties of all the steel rails treated by this ATQ process with 260 C tempering for 16 h or 30 h exceed the technical requirements.

Key words: U20Mn bainitic steel rail, water air altermative timed quenching (ATQ) process, microstructure, mechanical properties

CLC Number:

TG156.34

Zuo Xunwei, Zhang Miansheng, Chen Nailu, Chen Liangqi, Rong Yonghua, Cai Jianxu. Pilot-scale study of water-air alternative timed quenching technology for U20Mn steel rail[J]. Heat Treatment of Metals, 2020, 45(9): 50-56.

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