帘线钢LX72A夹杂物控制优化实践

Optimization Practice of Inclusion Control for LX72A Tire Cold Steel

结合中天钢铁第三炼钢厂帘线钢LX72A生产实际,通过控制铁水[Si]、[Ti]等含量和实施转炉"双渣留渣"冶炼技术,实现转炉出钢高拉w([C])≥0.12%、低w([P])≤0.008%和低w([Ti])≤0.005%的要求,有效减少脱氧产物和含Ti夹杂物数量。调整精炼渣系碱度和优化中间包流场,使盘条夹杂物成分达到CaO-Al_2O_3-SiO_2系相图塑性化控制目标,同时使铸坯夹杂物尺寸由最大48μm降低到20μm以内。

Combined with the practical production situation of LX72 A tire cold steel in No. 3 Steelmaking Plant of Zenith Steel Group Co.,Ltd,through controlling of silicon and titanium contents in the liquid iron,practicing double slag and slag-remaining technology,the requirements of tapping with w（ [C]） ≥0. 12%,w（ [P]） ≤0. 008% and w（ [Ti]） ≤0. 005% for converter was achieved,thus reducing the amount of deoxidation products and Ti-inclusion. The size of inclusion in billet was decreased from 48 μm to 20 μm by adjusting the basicity of refining slag and optimizing tundish fluid flow,so the chemical composition of inclusion in wire rod could reach the plastic control target of CaO-Al_2O_3-SiO_2 phase diagram.