ISSN:1003-8620

CN:42-1243/TF

主管:中信泰富特钢集团股份有限公司

主办:大冶特殊钢有限公司

特殊钢 ›› 2021, Vol. 42 ›› Issue (4): 25-29.

• 工艺技术 • 上一篇    下一篇

氩气保护ESR对EAF-LF-VD-CC冶炼的高速车轴钢DZ2轧坯质量的改善

张锦文1,2,王文先1,邬中华2,赵志刚2,王松伟2,王之香2,王玉玲2   

  1. 1. 太原理工大学材料科学与工程学院,太原030024;
    2. 山西太钢不锈钢股份有限公司技术中心,太原030003;
  • 收稿日期:2020-12-10 出版日期:2021-07-15 发布日期:2022-03-09
  • 作者简介:张锦文(1986-),男,博士研究生(太原理工大学),工程师,2009年南京航空航天大学(本科)毕业,铁路车轴钢材料研发
  • 基金资助:
    国家重点研发计划项目(2017YFB0304600)

Improvement on Quality of Rolled Billet of EAF-LF-VD-CC Steelmaking High-Speed Railway Axle Steel DZ2 by Argon Shielding ESR

Zhang Jinwen1,2,Wang Wenxian1 ,Wu Zhonghua2,Zhao Zhigang2,Wang Songwei2 ,Wang Zhixiang2,Wang Yuling2   

  1. 1. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024;
    2. Technology Center, Shanxi Taigang Stainless Steel Co Ltd, Taiyuan 030003;
  • Received:2020-12-10 Published:2021-07-15 Online:2022-03-09

摘要: 采用EAF-LF-VD-Φ690 mm铸坯和EAF-LF-VD-Φ690 mm铸坯-Φ740 mm ESR锭两种工艺分别制备了250 mm × 250 mm高铁车轴用DZ2钢轧坯,并研究了其低倍组织、夹杂物、碳偏析、金相组织和力学性能。结果表明:相比于电弧炉流程工艺,电渣重熔工艺得到的DZ2钢轴坯中心疏松和一般疏松从0.5~1.0级降低到0~0.5级,夹杂物尺寸从2.43~25.05 μm降低到1.42~9.32 μm,夹杂物形貌由棒状变为球形;横截面上碳含量分布从0.256%~0.269%降低到0.261%~0.265%,碳极差从0.013%降低到0.004%;屈服强度和抗拉强度分别提高了17.5%和13.8%,20℃横向和纵向冲击功分别提高36.2%和17.8%。

关键词: 高速车轴钢DZ2, EAF-LF-VD-CC, 电渣重熔, 夹杂物, 碳偏析, 力学性能

Abstract: The 250 mm x 250 mm rolled billets of high-speed railway axle steel DZ2 are rolled, by EAF-LF-VD-ϕ690 mm cast bloom and EAF-LF-VD-ϕ690 mm cast bloom-ϕ740 mm ESR ingot of two processes. The macrostructure, inclusions ,carbon segregation, microstructure and mechanical properties of the blooms are studied. The results show that: compared with EAF process flowsheet, the rating of central porosity and general porosity of DZ2 steel shaft billet obtained by ESR process reduces from 0.5 ~ 1.0 to 0 ~ 0.5 grade; the size range of inclusions reduces from 2.43 ~ 25. 05μm to 1. 42 ~ 9. 32μm, and the morphology of inclusion changes from rod-shaped to spherical; the carbon content distribution on cross-section reduces from 0.256% ~ 0.269% to 0.261 % ~ 0.265% , and the carbon range difference reduces from 0.013% to 0.004% ; the yield strength and tensile strength increase by 17.5% and 13.8% , respectively, and the transverse and longitudinal impact energy at 20℃. increase by 36.2% and 17.8% , respectively.