Behavior of Nonmetallic Inclusions in Ultra-Low Oxygen Steel 25CrMoVNi for High Speed Rail Axles during RH Refining Process

魏鹏远; 姜敏; 杨叠; 王新华; 孙维; 汪开忠

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Behavior of Nonmetallic Inclusions in Ultra-Low Oxygen Steel 25CrMoVNi for High Speed Rail Axles during RH Refining Process

更新时间：2026-01-21

- Behavior of Nonmetallic Inclusions in Ultra-Low Oxygen Steel 25CrMoVNi for High Speed Rail Axles during RH Refining Process
- Special Steel Vol. 36, Issue 3, Pages: 1-4(2015)
- 作者机构：
  
  1. 北京科技大学冶金与生态工程学院,北京,100083
  2. 马鞍山钢铁股份有限公司技术中心,马鞍山,243000
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Received：01 December 2014，
  
  Online First：17 August 2022，
  
  Published：17 August 2015
- 稿件说明：
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魏鹏远, 姜敏, 杨叠, et al. Behavior of Nonmetallic Inclusions in Ultra-Low Oxygen Steel 25CrMoVNi for High Speed Rail Axles during RH Refining Process[J]. Special Steel, 2015, 36(3): 1-4.
DOI：

魏鹏远, 姜敏, 杨叠, et al. Behavior of Nonmetallic Inclusions in Ultra-Low Oxygen Steel 25CrMoVNi for High Speed Rail Axles during RH Refining Process[J]. Special Steel, 2015, 36(3): 1-4. DOI：

摘要

25CrMoVNi钢由120 t EAF-LF-RH脱气-φ600 mm圆坯连铸工艺生产

EAF出钢时加Al预脱气使[Al

]

s≥0.030%

并加入石灰造渣预精炼

LF精炼时炉渣表面加Al粒扩散脱氧

LF精炼渣的组成为（/%）:53~57CaO

10~13SiO

27~28Al

6~9MgO

0.09~0.10MnO。RH脱气精炼结果表明

RH后T[O

]

由脱气前0.001 3%~0.001 5%降至0.000 5%;钢中TCa由0.001 9%降至0.000 9%~0.001 7%;夹杂物发生MgO·Al

→（MgO）z（CaO）x（Al

）y→（CaO）x（Al

）y的转变;最后以尖晶石类固相夹杂物数量迅速减少

以钙铝酸盐类的液相夹杂物数量呈现出先增加后减少

钢中夹杂物由6.7个/mm

下降至2.7个/mm

Abstract

The steel 25 CrMpVNi is produced by 120 t EAF-LF-RH degassing-φ600 mm round bloom casting process with adding Al to pre-deoxidize during EAF tapping

and get [ Al

]

s 0. 030% and adding lime slagging for pre-refining

adding aluminium shot at surface of refining slag (/% : 53 - 57CaO

10 -13SiO

27 -28Al

6 - 9MgO

0. 09 - 0. 10MnO) for diffusion deoxidation during LF refining. The RH degassing refining results show that at end RH process the T[O

]

decreases from begining RH 0. 0013% - 0. 001 5% to 0.0005% ; TCa in steel decreases From 0.001 9% to 0.000 9% - 0. 001 7% ； the inclusions transform from MgO· Al

to ( MgO) z ( CaO) x ( Al

) y and into ( CaO)x (Al

finally the amount of spinel type solid

phase inclusions decreases rapidly

the amount of calcium aluminate type liquid phase inclusions increases first and then decreases

and the number density of inclusions in steel decreases from 6. 7/mm

to 2. 7/mm

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