Thermodynamics Analysis and Control of Inclusion in 82B Hard Wire Steel

The formation conditions of inclusion in 82 B hard wire steel was predicted by the thermodynamics calculation. The calculation results indicate that when low basicity slag is used,the content of[Al]_S in the molten steel increases with the increasing of w_CaO/w_SiO2 ration and the content of Al₂O₃ in inclusion.The content of [Al]_S in the molten steel should be less than 6×10^-6 in order to control CaO-SiO₂-Al₂O₃ inclusion in plastic zone.Practical control result indicates that controlling refining slag composition （controlling the content of Al₂O₃ in the top slag less than 10%） which is selected based on result of thermodynamics calculation,while ensuring adequate soft blowing conditions （suitable argon flowing and more than 15 min soft blowing time）,controlling inclusion can be achieved.