Shape Control of Inclusions in High Nickel Content Steel

To control the inclusion shape of iron-nickel alloys, inclusion compositions were investigated in 2 kg scale experiments on deoxidation with flux. The effect of nickel content on deoxidation equilibrium of silicon or aluminum was discussed. Most of inclusions were considered to be secondary inclusions during cooling or solidification. Using the thermodynamic data, inclusion compositions were estimated. The accuracy of the estimation is good, and it proved to be possible to estimate the inclusion compositions.