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 ›› 2022, Vol. 43 ›› Issue (1): 39-43.

• 工艺技术 • 上一篇    下一篇

轻压下改善42CrMo钢300mm × 400 mm大方坯内部质量的工艺实践

饶金元1,张孟昀2, 陈  君1, 赵立华3, 包燕平2   

  1. 1 大冶特殊钢有限公司转炉厂,黄石 435001 ;    
    2 北京科技大学钢铁冶金新技术国家重点实验室,北京 100083 ;    
    3 北京科技大学冶金与生态工程学院,北京 100083
  • 收稿日期:2021-05-26 出版日期:2022-01-25 发布日期:2022-03-18
  • 作者简介:饶金元(1983-),男,硕士(2010 年昆明理工大学),工程师,特殊钢冶炼及连铸技术研究 。

Process Plactice on Improvement of Internal Quality of 300 mm x 400 mm Cast Bloom of Steel 42CrMo by Soft Reduction

Rao Jinyuan1, Zhang Mengyun2, Chen Jun1 , Zhao Lihua3,Bao Yanping2   

  1. 1 Converter Workshop, Daye Special Steel Co Ltd, Huangshi 435001 ;
    2 State Key Laboratory of Advanced Metallurgy, University of Science and Technology, Beijing 100083;
    3 School of Metallurgical and Ecological Engineering, University of Science and Technology, Beijing 100083
  • Received:2021-05-26 Published:2022-01-25 Online:2022-03-18

摘要: 以中碳钢42CrMo为试验钢,通过建立300 mm×400 mm连铸大方坯凝固传热模型,确定合理压下区间4#~7#辊压下量分别为"1 mm-2 mm-3 mm-1 mm",并进行工业试验。试验结果表明,轻压下工艺对铸坯凝固各组织占比影响不大,但可明显改善中心致密性和偏析。铸坯芯部最大疏松点尺寸由1 106μm×608μm缩小至600μm×334μm,横截面上碳偏析指数范围由0.889~1.095缩小至0.962~1.064。轻压下工艺可有效改善铸坯内部质量。

关键词: 42CrMo钢, 轻压下, 大方坯, 凝固组织, 中心偏析

Abstract: Taking medium carbon steel 42CrMo as test steel, through established solidification heat transfer model of 300 mm x400 mm continuous casting bloom? in reasonable reduction zone the reduction of No. 4,5 ,6 and 7 roller being "1 mm-2 mm-3 mm-1 mm” is defined, and the industrial experiment is carried out. The experimental results show that the soft reduction process has little effect on the solidification structure of the bloom, but the central compactness and segregation can be improved obviously. The size of the largest porosity point in the core of bloom is reduced from 1 106 μm x 608μm to 600 μm x 334 μm; the carbon segregation index range on the cross section is reduced from 0. 889 ~ 1. 095 to 0. 962 ~ 1. 064. The soft reduction process can effectively improve the internal quality of the bloom.