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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。
The thermodynamics calculations of the formation conditions of inclusions in 82B hardline steel show that [Al] S increases with the increase of wCaO / wSiO2 ratio and Al 2 O 3 content in the inclusions In order to control the CaO-SiO2-Al_2O_3 inclusions in the plastic zone, the [Al] S in molten steel should be less than 6 × 10 -6. The results of the actual control show that controlling the refining slag composition (controlling the content of Al 2 O 3 in the top slag below 10%) in accordance with the thermodynamic calculation results while ensuring adequate soft blowing conditions (suitable argon flow rate and soft blowing time greater than 15 min) Inclusion control objectives can be achieved.