Evolution of Inclusions in Gear Steel 18CrNiMo7-6 during 60t LF-VD Reflning Process

刘金鑫; 冯桂萍; 张龙; 顾文涛; 刘玉芬

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Evolution of Inclusions in Gear Steel 18CrNiMo7-6 during 60t LF-VD Reflning Process

更新时间：2026-01-21

- Evolution of Inclusions in Gear Steel 18CrNiMo7-6 during 60t LF-VD Reflning Process
- Special Steel Vol. 37, Issue 6, Pages: 5-8(2016)
- 作者机构：
  
  1. 抚顺特殊钢股份有限公司1技术中心
  2. 中心试验室,抚顺,113001
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：24 June 2016，
  
  Online First：25 July 2022，
  
  Published：25 July 2016
- 稿件说明：
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刘金鑫, 冯桂萍, 张龙, et al. Evolution of Inclusions in Gear Steel 18CrNiMo7-6 during 60t LF-VD Reflning Process[J]. Special Steel, 2016, 37(6): 5-8.
DOI：

刘金鑫, 冯桂萍, 张龙, et al. Evolution of Inclusions in Gear Steel 18CrNiMo7-6 during 60t LF-VD Reflning Process[J]. Special Steel, 2016, 37(6): 5-8. DOI：

摘要

18CrNiMo7-6钢（/%:0.17C

0.57Mn

0.24Si

0.012P

0.003S

1.70Cr

1.49Ni

0.28Mo）的冶金流程为60t EAF-LF-VD-2.1t铸锭。取样分析了EAF铝锭预脱氧

LF铝粒和碳化硅混合脱氧剂扩散脱氧（LF初渣成分/%:57~60CaO

20.5~22.0Al

9.9~11.3SiO

8.8~10.6MgO

0.7~1.1FeO

0.7~0.9MnO）

VD后和软吹后钢中夹杂物数量、尺寸和组成的变化。结果表明

精炼过程1~10μm夹杂物数量降低16.67%

>10μm夹杂物数量降低50%

≥30μm夹杂物基本去除;精炼过程中生成的夹杂主要为镁铝钙的复合夹杂物和CaS

MgS

MnS等硫化物;成品材中主要为Mg-Al的氧化物夹杂

硫化物以MgS为主

有少量MnS、CaS。应进一步优化冶炼工艺

控制中小型夹杂物的形成。

Abstract

The metallurgical flowsheet for steel 18CrNiMo7-6 (/%: 0. 17C

0. 57Mn

0. 24Si

0. 012P

0. 003S

1.70Cr

1. 49Ni

0. 28Mo) is 60t EAF-LF-VD-2.1t ingot. The variation of amount

size and ingredient of inclusions in steel after EAF aluminium pre-oxidation

LF aluminium shot and silicon-carbide mix deoxidant diffusion deoxidation (LF initial slag ingredient /%: 57 ~ 60CaO

20. 5 ~ 22. 0Al

9. 9 ~ 11. 3SiO

8. 8 ~ 10. 6MgO

0. 7 ~ 1. 1FeO

0. 7 ~ 0.9MnO)

VD and soft blowing has been analyzed by sampling. Results show that during refining process the amount of inclusions decreases by 16. 67%

the amount of >10μm inclusions decreases by 50% and the ≥30μm inclusions basically are removed from liquid ； during re

fining process the main formed-inclusions are magnesium-aluminium-calcium compound inclusions and CaS

MgS and MnS etc sulfide; the main inclusions in finished products are Mg-Al oxides and main sulfide is MgS with minor MnS and CaS etc sulfide. The further optimized steelmaking process is to control the formation of small and medium size inclusions.

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