Effects of MgO Contents in Slag on Inclusions in H13 Steel Deoxidized with Mg-Al-Fe Alloy

WU Zheng; LI Jing; SHI Cheng-bin; DU Gang

doi:10.11973/jxgccl201510002

Materials and Mechanical Engineering > 2015 > 39(10): 5-10. > DOI: 10.11973/jxgccl201510002

WU Zheng, LI Jing, SHI Cheng-bin, DU Gang. Effects of MgO Contents in Slag on Inclusions in H13 Steel Deoxidized with Mg-Al-Fe Alloy[J]. Materials and Mechanical Engineering, 2015, 39(10): 5-10. DOI: 10.11973/jxgccl201510002

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Effects of MgO Contents in Slag on Inclusions in H13 Steel Deoxidized with Mg-Al-Fe Alloy

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Received Date: May 02, 2015

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Abstract

The effects of MgO contents in slag system CaO-SiO2-Al2O3-MgO-CaF2 on the number, size and composition of inclusions in H13 steel deoxidized with Mg-Al-Fe alloy were studied. Results show that when the content of MgO in the slag was 5wt%, the minimum number of inclusions was 55.62 per square millimeter, and the size of all inclusions was less than 8 μm. When the content of MgO in the slag was less than or more than 5wt%, there was more number of inclusions in the steel, and the size of some inclusions was 8-10 μm. When the content of MgO in the slag was 5wt%, 8wt%, 12wt%, respectively, the inclusions were MgO·Al2O3 and Al2O3-SiO2, MgO·Al2O3 and Al2O3-SiO2-CaO, MgO·Al2O3 and Al2O3-SiO2-CaO-MgO, respectively. A stability diagram of inclusions corresponding to magnesium and alumina contents in the steel was calculated employing available thermodynamic data, and the A-type inclusion composition experimentally obtained well agreed with the diagram.
- inclusion,
- H13 steel,
- spinel,
- thermodynamics,
- magnesium

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