The Evolution Mechanism of Inclusion CaO Content in High Carbon Chromium Bearing Steel During VD Treatment

Miao Zhiqi; Yin Qing; Lu Changhe; Hua Liukai; Guan Yuehui; Cheng Guoguang

doi:10.20057/j.1003-8620.2025-00153

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The Evolution Mechanism of Inclusion CaO Content in High Carbon Chromium Bearing Steel During VD Treatment

更新时间：2025-09-26

- The Evolution Mechanism of Inclusion CaO Content in High Carbon Chromium Bearing Steel During VD Treatment
- Special Steel Pages: 1-7(2025)
- 作者机构：
  
  1.江阴兴澄特种钢铁有限公司特钢研究院，江阴 214429
  2.北京科技大学绿色低碳钢铁冶金全国重点实验室，北京 100083
- 作者简介：
- 基金信息：
- DOI：10.20057/j.1003-8620.2025-00153
  CLC： TF769.4
- Received：24 June 2025，
  
  Online First：19 September 2025，
- 稿件说明：
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苗志奇,尹青,陆长河等.高碳铬轴承钢 VD 处理中夹杂物CaO含量演变机制[J].特殊钢,

Miao Zhiqi,Yin Qing,Lu Changhe,et al.The Evolution Mechanism of Inclusion CaO Content in High Carbon Chromium Bearing Steel During VD Treatment[J].Special Steel,
苗志奇,尹青,陆长河等.高碳铬轴承钢 VD 处理中夹杂物CaO含量演变机制[J].特殊钢, DOI：.

Miao Zhiqi,Yin Qing,Lu Changhe,et al.The Evolution Mechanism of Inclusion CaO Content in High Carbon Chromium Bearing Steel During VD Treatment[J].Special Steel, DOI：.

摘要

通过工业试验和热力学计算，研究了VD处理过程中夹杂物CaO含量的演变机制，并分析了钢液和炉渣成分对钢渣反应的影响。研究发现，经过VD过程，炉渣中

［CaO］降幅达14%，而钢液中

［Al］的烧损率高达70%，表明在VD过程中发生了剧烈的钢渣反应，且夹杂物中的平均

［CaO］从VD前的6.8%升高到了11.3%，夹杂物尺寸增加。理想的动力学条件和VD过程中Ca的蒸发共同触发并有望进一步增强钢液中Al和炉渣中CaO之间的化学反应，使得炉渣中的Ca进入钢液，其中一部分溶解Ca会与钢液中低CaO或者无CaO的夹杂物接触并发生反应，使得夹杂物中的CaO含量升高。为了抑制VD过程的钢渣反应，可以采取提高炉渣中Al

含量、增加VD过程压力等措施。

Abstract

The evolution mechanism of CaO content in inclusions during VD treatment was studied through industrial experiments and thermodynamic calculations， and the effects of steel liquid and slag composition on steel slag reaction were analyzed. The study found that after the VD process， the CaO content in the slag decreased by 14%， while the Al content in the molten steel had a burning loss rate of up to 70%， indicating that a intense

steel slag reaction occurred during the VD process. The average CaO mass fraction in the inclusions increased from 6.8% before VD to 11.3%， and the inclusion size increased. The ideal dynamic conditions and the evaporation of Ca during the VD process jointly trigger and were expected to further enhance the chemical reaction between Al in the molten steel and CaO in the slag， allowing Ca in the slag to enter the molten steel. Some of the dissolved Ca will come into contact with low CaO or CaO free inclusions in the molten steel and react， resulting in an increase in CaO content in the inclusions.In order to suppress the steel slag reaction during the VD process， measures such as increasing the Al

content in the slag and increasing the pressure during the VD process can be taken.

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