Effect of Tempering Process on Microstructure and Properties  of Hot rolled U20Mn2SiCrNiMo Bainitic Rail Steel

杨维宇; 何建中; 梁正伟; 李智丽

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Effect of Tempering Process on Microstructure and Properties of Hot rolled U20Mn2SiCrNiMo Bainitic Rail Steel

更新时间：2026-01-21

- Effect of Tempering Process on Microstructure and Properties of Hot rolled U20Mn2SiCrNiMo Bainitic Rail Steel
- Special Steel Vol. 42, Issue 6, Pages: 68-71(2021)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：02 April 2021，
  
  Online First：03 January 2022，
  
  Published：03 January 2021
- 稿件说明：
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杨维宇, 何建中, 梁正伟, et al. Effect of Tempering Process on Microstructure and Properties of Hot rolled U20Mn2SiCrNiMo Bainitic Rail Steel[J]. Special Steel, 2021, 42(6): 68-71.
DOI：

杨维宇, 何建中, 梁正伟, et al. Effect of Tempering Process on Microstructure and Properties of Hot rolled U20Mn2SiCrNiMo Bainitic Rail Steel[J]. Special Steel, 2021, 42(6): 68-71. DOI：

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K

98 J，轨底纵向残余应力+180 MPa。

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 K

is 98 J

and longitudinal residual stress of rail bottom +180 MPa.

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