Behavior of Inclusions in 150 t BOF-LF-VD-CC Flow Sheet Non-Aluminium Deoxidation Steelmaking Process of High-Speed Rail Steel

刘平; 李笑英; 智建国; 陈爱梅

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Behavior of Inclusions in 150 t BOF-LF-VD-CC Flow Sheet Non-Aluminium Deoxidation Steelmaking Process of High-Speed Rail Steel

更新时间：2026-01-21

- Behavior of Inclusions in 150 t BOF-LF-VD-CC Flow Sheet Non-Aluminium Deoxidation Steelmaking Process of High-Speed Rail Steel
- Special Steel Vol. 34, Issue 5, Pages: 51-53(2013)
- 作者机构：
  
  1. 内蒙古包钢钢联股份有限公司,包头,014010
  2. 内蒙古一机集团有限公司,包头,014010
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：22 April 2013，
  
  Online First：22 September 2022，
  
  Published：22 September 2013
- 稿件说明：
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刘平, 李笑英, 智建国, et al. Behavior of Inclusions in 150 t BOF-LF-VD-CC Flow Sheet Non-Aluminium Deoxidation Steelmaking Process of High-Speed Rail Steel[J]. Special Steel, 2013, 34(5): 51-53.
DOI：

刘平, 李笑英, 智建国, et al. Behavior of Inclusions in 150 t BOF-LF-VD-CC Flow Sheet Non-Aluminium Deoxidation Steelmaking Process of High-Speed Rail Steel[J]. Special Steel, 2013, 34(5): 51-53. DOI：

摘要

时速350 km高速钢轨要求钢中全氧含量T[O

]

≤20×10

-6

非金属夹杂物B、C、D类≤1.0级。国内在重轨钢冶炼中

通常采用无铝脱氧工艺

即采用SiCaBa合金强化脱氧

形成了低熔点的Mn-Al-Si-Ba-Ca多元型氧化物夹杂

该类夹杂物在精炼中全部排出钢液。研究了铁水预处理脱硫-150 t顶底复吹转炉-LF-VD-280 mm ×380 mm连铸流程冶炼钢轨钢U71MnG时的夹杂物行为

包括无铝脱氧工艺钢轨钢中氧化物夹杂的组成及特征

转炉终点[C

]

对钢水氧活度的影响以及LF精炼渣碱度和VD后期软吹氩搅拌对钢氧含量和夹杂物的影响。结果得出

钢轨头部的≤20μm氧化物夹杂为精炼时二次脱氧产物

通过控制转炉终点[C

]

＞0.15%

控制精炼渣碱度(CaO)/(SiO

)=2.5~3

∑(FeO+MnO)≤1.0%可有效降低钢轨钢中氧化物的数量和尺寸。

Abstract

Quality requirement for 350 km/h high-speed rail steel is total oxygen content in steel- T[O

]

≤20 x 10

-6

and B

C and D series inclusions rating ≤1.0. In domestic heavy rail steel steelmaking process

it is normally to using non-aluminium deoxidation process

i. e. intensifying deoxidation by using SiCaBa alloy to form low melting point Mn-Al-Si- Ba-Ca multicomponent oxide inclusions which all remove from liquid during refining process. The behavior of inclusions in rail steel U71MnG steelmaking by hot metal desulphurization pretreatment-150 t top and bottom combined blowing convert- er-LF-VD-280 mm x 380 mm CC flow sheet is studied

including the ingredient and characteristics of oxide inclusions in rail s

teel steelmaking by non-aluminium deoxidation process

the effect of converter end [C

]

on oxygen activity of liquid and the effect of basicity of LF refining slag and soft argon stirring process in later period of VD process on inclusions and oxygen content in steel. It is obtained that the ≤20 μm oxide inclusions in head of rail is seconadry deoxidation products during refining process

with controlling converter end [C

]

＞0.15%

controlling basicity of refining slag- (CaO)/(SiO

) =2.5-3 and S (FeO + MnO) ≤1.0%

it is available to decrease the quantity and size o£ oxides in rail steel.

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