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

Rao Jinyuan; Zhang Mengyun; Chen Jun; Zhao Lihua; Bao Yanping

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

更新时间：2025-10-28

- Process Plactice on Improvement of Internal Quality of 300 mm x 400 mm Cast Bloom of Steel 42CrMo by Soft Reduction
- Special Steel Vol. 43, Issue 1, Pages: 39-43(2022)
- 作者机构：
  
  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
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：26 May 2021，
  
  Online First：18 March 2022，
  
  Published：18 March 2022
- 稿件说明：
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Rao Jinyuan, Zhang Mengyun, Chen Jun, et al. Process Plactice on Improvement of Internal Quality of 300 mm x 400 mm Cast Bloom of Steel 42CrMo by Soft Reduction[J]. Special Steel, 2022, 43(1): 39-43.
DOI：

Rao Jinyuan, Zhang Mengyun, Chen Jun, et al. Process Plactice on Improvement of Internal Quality of 300 mm x 400 mm Cast Bloom of Steel 42CrMo by Soft Reduction[J]. Special Steel, 2022, 43(1): 39-43. DOI：

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。

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

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 cent

ral 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.

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