82B硬线钢中夹杂物热力学分析及控制

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Al_2O_3含量增大而增加,为把CaO-SiO2-Al_2O_3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Al_2O_3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。

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

The formation conditions of inclusion in 82B 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 wao/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 rain soft blowing time),controlling inclusion can be achieved.