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| Solidified crust mechanism of refining slag for GCr15 bearing steel |
| LIU Zhi-hong，ZHANG Xing-zhong |
| （National Engineering Research Center of Continuous Casting Technology， Central Iron and Steel Research Institute，Beijing 100081， China |
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Abstract The problem of increasing of gas and inclusions in molten steel was caused by the solidified crust of refining slag during the production of the GCr15 bearing steel. The effect of the chemical composition，melting conditions and microstructure on solidified crust was studied by chemical analysis，melting test，SEM and XRD of the industrial refining slag. The results showed that the crust composed primarily of calcium aluminates，calcium oxide，magnesium-aluminium spinel，and dicalcium silicate. The bond of calcium aluminates crystals was strengthened，which made the refining slag crusted caused by numerous high melting point precipitates of calcium oxide，magnesium-aluminium spinel and dicalcium silicate precipitate ahead of the low melting point calcium aluminates，and enriched the low melting precipitates. Solidified crusts can be prevented by reducing the precipitation of high melting point phase during cooling process when the refining slag composition is optimized in the range of low melting point area in CaO-SiO2-Al2O3-MgO phase diagram.
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Received: 17 December 2014
Published: 11 June 2015
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魏果能，许达，俞峰.高质量轴承钢的需求、生产和发展[C]，中国特殊钢年会2005论文集，2005.[ ]张静，于会香，王新华等.精炼渣成分对高强度低合金钢中非金属夹杂物影响[J].北京科技大学学报，2011,33(7):828-833.[ ]Park J H, Jung I H, Lee H G. Dissolution behavior of Al2O3 and MgO inclusions in the CaO-Al2O3-SiO2 slags: formation of ring-like structure of MgAl2O4 and Ca2SiO4 around MgO inclusions. ISIJ Int，2006,46（11）：1635-1644.[ ]于平，陈伟庆，冯军等.高碱度渣精炼的轴承钢中夹杂物研究[J].钢铁，2004，39(7):20-23.[ ]B.-H. Yoon, K.-H Heo, J.-S Kim, et al. Improvement of Steel Cleanliness by Controlling Slag Composition[J]. Ironmaking and Steelmaking，2002, 29(3):215-218.[ ]李胜荣.结晶学与矿物学[M].北京：地质出版社，2008.[ ]李晓生.无机非金属材料物相分析与研究方法[M].北京：中国建材工业出版社.2008.[ ]王海风，张春霞，齐渊洪等. 高炉渣非晶态组分的定量研究[J]. 钢铁，2008,43（8）：16-19.[ ]叶大伦，胡建华.实用无机物热力学数据手册[M]．北京：冶金工业出版社，2002.[ ]德国钢铁工程师协会.渣图集[M].北京：冶金工业出版社，1989.
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2015, Vol. 50 
