| 回火工艺对热轧U20Mn2SiCrNiMo贝氏体钢轨组织性能的影响 |
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| 引用本文： | 杨维宇,何建中,梁正伟,李智丽.回火工艺对热轧U20Mn2SiCrNiMo贝氏体钢轨组织性能的影响[J].特殊钢,2021,42(6):68-71. |
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| 作者姓名： | 杨维宇 何建中 梁正伟 李智丽 |
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| 作者单位： | 1内蒙古包钢金属制造有限责任公司研发中心，包头 014010;
2内蒙古包钢钢联股份有限公司技术中心，包头014010 |
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| 基金项目： | 国家重点研发计划资助(2017YFB0304504) |
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| 摘 要： | U20Mn2SiCrNiMo贝氏体钢轨的生产流程为150 t 转炉-LF-VD-280 mm×380 mm铸坯 轧制，终轧930~980 ℃,空冷-340 ℃ 4 h两次回火，空冷。U20Mn2SiCrNiMo钢热轧态(终轧930~980 ℃空冷）和(320 ℃一、二次回火)组织均由贝氏体、马氏体和残余奥氏体组成。力学性能试验结果表明：U20Mn2SiCrNiMo钢轨最佳回火工艺为320 ℃ 4 h空冷+320 ℃ 4 h空冷二次回火，其性能为：屈服强度1242 MPa，抗拉强度1393 MPa，HBW硬度值417，伸长率15.0%，断面收缩率60%，冲击吸收功KU2 98 J，轨底纵向残余应力+180 MPa。
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| 收稿时间： | 2021-04-02 |
Effect of Tempering Process on Microstructure and Properties of Hot rolled U20Mn2SiCrNiMo Bainitic Rail Steel |
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| Yang Weiyu,He Jianzhong,Liang Zhengwei,Li Zhili.Effect of Tempering Process on Microstructure and Properties of Hot rolled U20Mn2SiCrNiMo Bainitic Rail Steel[J].Special Steel,2021,42(6):68-71. |
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| Authors: | Yang Weiyu He Jianzhong Liang Zhengwei Li Zhili |
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| Affiliation: | 1 Research Center of Metal Manufacture Co Ltd of Inner Mongolia Baotou Steel Union，Baotou 014010;
2 Technical Center of Inner Mongolia Baotou Steel Union Co Ltd,Baotou 014010 |
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| Abstract: | The flowsheet process of U20Mn2SiCrNiMo bainitic rail steel is 150 t BOF-LF-VD-280 mm×380 mm cast bloom-rolling,finishing at 930～980℃,air cooling -340℃ 4 h,air cooling,double tempeing.The microstructure of hotrolled(end rolling at 930～980℃ air cooling)and tempered(320 ℃once-and double-tempering)of U20Mn2SiCrNiMo steel is composed of bainite, martensite and retained austenite.Mechenical properties test results show that the optimum tempering process of U20Mn2SiCrNiMo steel rail is 320℃4 h air cooling+320℃4 hair cooling,double tempeing,its yield strength is 1242 MPa,tensile strength 1393 MPa,HBW hardness 417,elongation 15.0%,reduction of area 60%,impact absorption work Ku2 is 98 J,and longitudinal residual stress of rail bottom +180 MPa. |
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