Effects of AIMnCa and AIMnFe Alloys on Deoxidization of Low Carbon and Low Silicon Aluminum Killed Steels

To confirm the effects of AlMnCa and AlMnFe alloys on the deoxidization and modification of Al2O3 inclusions, experiments of 4-heat low carbon and low silicon aluminum killed steels deoxidized by AIMnCa and AIMnFe alloys were done in a MoSi2 furnace at 1 873 K. It is found that the 1# AIMnCa alloy has the best ability of deoxidization and modification of Al2O3 inclusions than 2# AlMnCa and AlMnFe alloys. Steel A deoxidized by 1# AlMnCa alloy has the lowest total oxygen content in the terminal steel, which is 37×10−6. Most of the inclusions in the steel deoxidized by 1# AlMnCa alloy are spherical CaO-containing compound inclusions, and 89. 1% of them are smaller than 10 μ. The diameter of the inclusion bigger than 50 μ is not found in the final steels deoxidized by AlMnCa alloys. Whereas, for the steels deoxidized by AlMnFe alloys, most inclusions in the terminal steel are Al2O3 or Al2O3-MnO inclusions, and a few of them are spherical, and only 76. 8% of them are smaller than 10 μ. Some inclusions bigger than 50 μ are found in the steel D deoxidized by AlMnFe alloy.