2010•Unpublished venueRequires access

Evolution of Mgo·Al 2 O 3 Based Inclusions in Alloy Steel During the Refining Process

Shufeng Yang, Jingshe Li, Lifeng Zhang, Kent D. Peaslee, Zaifei Wang

Abstract

The transformation of MgO·Al2O3 based inclusions in alloy steel during refining has been studied by industrial trials. Besides Factsage software is applied to study the formation and modification of spinel inclusions in alloy steel using calcium treatment during refining process. The results show the transformation sequence of inclusions is: MgO·Al2O3 → CaO– Al2O3–MgO complex inclusions → MgO·Al2O3, and under present experimental condition, in order to avoid forming MgOAl2O3 inclusions the content of dissolved Ca in the molten steel has to reach 1ppm. Also the results show that when more calcium was added into molten steel, the content of Al2O3 and MgO will be lower. Besides, increases the content of CaO in the inclusions will increase even if the content of SiO2 changes little.

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Key concepts: Refining (metallurgy), Metallurgy, Spinel, Materials science, Alloy, Inclusion (mineral), Non-metallic inclusions, Mineralogy