Optimization of heat treatment process for high strength steel rail R400HT

doi:10.13251/j.issn.0254-6051.2023.06.018

Abstract

Abstract: Taking high strength eutectoid rail R400HT as research object, and the microstructure transformation and hardness properties of the R400HT steel rail during cooling were tested, and the CCT curves of the R400HT steel rail was established. On this basis, the range of main heat treatment process parameters of the R400HT steel rail was developed, and the thermal simulation orthogonal experiment was carried out. Through statistical analysis of the test results, the optimal heat treatment process scheme of the R400HT steel rail was obtained. The results show that the optimal treatment process of the R400HT rail steel is that the inlet temperature of 780-800 ℃, the outlet temperature of 480-510 ℃, and the cooling rate of 3.0-3.5 ℃/s. The industrial trial production is carried out according to the above process. The hardness of the trial R400TH rail is 425.5-428.3 HBW, the tensile strength is 1425-1440 MPa, and the microstructure is pearlite, which achieves the expected goal.

Key words: high strength rail R400HT, microstructure, hardness, hypereutectoid steel

CLC Number:

TG156

Li Junzheng, Han Zhijie, Zhao Haitao. Optimization of heat treatment process for high strength steel rail R400HT[J]. Heat Treatment of Metals, 2023, 48(6): 101-106.

References

[1]田常海. 大秦重载铁路75 kg/m钢轨伤损特点及规律[J]. 铁道工程学报, 2019, 36(1): 38-42, 53.
Tian Changhai. Damage characteristics and rules of 75 kg/m rail in Datong-Qinhuangdao heavy haul railway[J]. Journal of Railway Engineering Society, 2019, 36(1): 38-42, 53.
[2]李闯, 张银花, 田常海, 等. 27 t轴重条件下重载铁路钢轨适应性研究[J]. 中国铁道科学, 2019, 40(5): 35-41.
Li Chuang, Zhang Yinhua, Tian Changhai, et al. Study on adaptability of rail used for heavy haul railway under 27 t axle load[J]. China Railway Science, 2019, 40(5): 35-41.
[3]金纪勇, 王冬, 陈昕, 等. 重载铁路60 kg·m^-1贝氏体钢轨试验及应用[J]. 中国铁道科学, 2021, 42(4): 34-40.
Jin Jiyong, Wang Dong, Chen Xin, et al. Test and application of 60 kg·m^-1 bainitic rail for heavy haul railway[J]. China Railway Science, 2021, 42(4): 34-40.
[4] Masaharu Ueda, Koichi Uchino, Akira Kobayashi. Effects of carbon content on wear property in pearlitic steels[J]. Wear, 2002, 253(1/2): 107-113.
[5] 董嘉兵, 王慧军, 陈林, 等. 新型H380级别高强度钢轨热处理工艺的数值模拟[J]. 特殊钢, 2020, 41(4): 1-5.
Dong Jiabing, Wang Huijun, Chen Lin, et al. Numerical simulation on heat treatment process of H380 new high strength steel rail[J]. Special Steel, 2020, 41(4): 1-5.
[6] 韩志杰, 李钧正, 武东东. 高品质热处理钢轨开发[J]. 南方金属, 2021(4): 7-9, 36.
Han Zhijie, Li Junzheng, Wu Dongdong. Development of high quality heat treated rail[J]. Southern Metals, 2021(4): 7-9, 36.
[7] 陈琳, 达木仁扎布, 王永明, 等. U76CrRE钢轨在线热处理工艺研究[J]. 包钢科技, 2021, 47(2): 1-5.
Chen Lin, Damuren Zhabu, Wang Yongming, et al. Study on on-line heat treatment technology of U76CrRE rail[J]. Science and Technology of Baotou Steel, 2021, 47(2): 1-5.
[8] 于有相. 钢轨热处理生产工艺及产品现状[J]. 铁路采购与物流, 2022, 17(4): 55-57.
[9] 王慧军, 涛雅, 陈林, 等. U76CrRE钢轨热处理过程组织控制及性能[J]. 金属热处理, 2022, 47(5): 161-165.
Wang Huijun, Tao Ya, Chen Lin, et al. Microstructure control and properties of U76CrRE steel rail during heat treatment[J]. Heat Treatment of Metals, 2022, 47(5): 161-165.
[10] 王东梅, 赵磊城, 陈林, 等. 过共析钢轨钢的连续冷却转变行为[J]. 金属热处理, 2021, 46(2): 45-49.
Wang Dongmei, Zhao Leicheng, Chen Lin, et al. Continuous cooling transformation behavior of hypereutectoid rail steel[J]. Heat Treatment of Metals, 2021, 46(2): 45-49.
[11] 宋维锡. 金属学[M]. 2版. 北京: 冶金工业出版社, 2008: 177.
[12] 刘宗昌, 任慧平, 宋义全, 等. 金属固态相变教程[M]. 2版. 北京: 冶金工业出版社, 2011: 36.
[13] 孙宜强. 钢中珠光体片间距测量方法研究[C]//中国金属学会, 宝钢集团有限公司. 第十届中国钢铁年会暨第六届宝钢学术年会论文集II. 北京: 冶金工业出版社, 2015: 6.
[14] 崔忠圻, 覃耀春. 金属学与热处理[M]. 北京: 机械工业出版社, 2007: 40.
[15] 董敬莎. 孙晓燕. 牛博英. 正交和均匀实验设计方法的比较[J]. 科技世界, 2013(22): 78-78.