Thermodynamics Analysis and Control of Inclusion in 82B Hard Wire Steel
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摘要: 对82B硬线钢中夹杂物的形成条件进行了热力学理论计算, 结果表明:采用低碱度渣时, 钢液中[Al]S随着夹杂物中wCaO/wSiO2比值和Al2O3含量增大而增加, 为把CaO-SiO2-Al2O3夹杂物控制在塑性区, 钢液中[Al]S应小于6×10-6。实际控制结果表明, 按照热力学计算结果控制精炼炉渣成分 (控制顶渣中的Al2O3含量低于10%), 同时保证充足的软吹条件 (合适的氩气流量和大于15 min的软吹时间), 可以达到夹杂物控制目标。Abstract: 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 wCaO/wSiO2 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.
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Key words:
- hard wire steel /
- inclusion /
- thermodynamics calculation /
- soft bubbling
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