Narrow Results

In order to study the impact of Mg deoxidation on the inclusions and properties of Low Carbon and Low Alloy Steel, five heats of 5.72%Mg-50.5%A1-7.92Mn-Fe Alloy (AlMnMgFe) deoxidation trails were done during a 150 tons BOF taping at a steelmaking plant. Optical microscope (OM) was used to test the diameter and number of the inclusions. SEM and EDS were used to examine the types of the inclusions. Then the microstructures and properties of the steels were tested at the room temperature. The results show that, by using AlMnMgFe as the deoxidizer, the inclusions, microstructures and properties of the low carbon and low alloy steel Q195 are improved. There are some spherical MgO·Al₂O₃ inclusions in the AlMnMgFe deoxidation heats. The diameters of 97.01 percent inclusions are smaller than 3 µm in the AlMnMgFe deoxidization steel, and it is higher than that of Al-killed steel. The mean yield strength, mean tensile strengths and mean elongation of the AlMnMgFe deoxidization steels are higher than Al-killed steels.