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  

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

作　　者：张锦文[1,2] 王文先[1] 邬中华[2] 赵志刚 王松伟 王之香[2] 王玉玲[2] Zhang Jinwen;Wang Wenxian;Wu Zhonghua;Zhao Zhigang;Wang Songwei;Wang Zhixiang;Wang Yuling(College of Materials Science and Engineering,Taiyuan University of Technology,Taiyuan 030024;Technology Center,Shanxi Taigang Stainless Steel Co Ltd,Taiyuan 030003)

机构地区：[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

出　　处：《特殊钢》2021年第4期25-29,共5页Special Steel

基　　金：国家重点研发计划项目(2017YFB0304600)。

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2.43~25.05μm降低到1.42~9.32μm,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%。The 250 mm ×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 2.43~25.05 μm to 1.42~9.32 μm,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 from0.013% 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.

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 

分 类 号：TG142[一般工业技术—材料科学与工程] U270.41[金属学及工艺—金属材料]