高碳硬线钢82B中Al_2O_3-SiO_2-MgO-CaO-MnO系夹杂物塑性化控制

Deformability control of Al_2O_3-SiO_2-MgO-CaO-MnO system inclusions in high carbon hard wire 82B steel

分析了高碳硬线钢82B在冶炼过程中复合夹杂物-钢液-渣及耐火材料局部动态平衡反应过程及Mn、Si和Al脱氧条件下夹杂物成分变化规律.利用热力学计算软件FactSage进一步计算分析了硬线钢获得良好变形能力的Al2O3-SiO2-MgO-CaO-MnO五元系夹杂物所需要的条件:钢液中[Al]的质量分数控制在(25～100)×10-6时,相应地钢液中溶解[O]的质量分数可以控制在(5～20)×10-6.在低熔点区域内,[Si]的质量分数可以控制在0.1%～1.5%;[Mn]的质量分数控制在0.2%～1%.

Local dynamic equilibrium reaction process for the reactions involving complex inclusions,molten steel,slag and refractory materials in steelmaking of high carbon hard wire 82B steel melt was studied and the compositional variation of the inclusions using Mn,Si and Al deoxidation was discussed.The formation condition of plastic inclusions for the Al2O3-SiO2-MgO-CaO-MnO system was calculated and analyzed by the thermodynamic software FactSage.The results reveal that the mass fractions of [Al] and [O] in molten steel are controlled at 25×10-6 to 100×10-6 and 5×10-6 to 20×10-6,respectively.In the low-melting point zone,the mass fraction of Si is controlled at 0.1% to 1.5% and that of Mn at 0.2% to 1%.