精炼渣成分对42CrMo钢洁净度的影响

为了研究不同精炼渣对42CrMo钢中洁净度和夹杂物数量、尺寸的影响,采用渣-钢平衡试验和FactSage热力学理论研究了CaO-Al₂O₃-SiO₂-MgO四元渣系对42CrMo钢中洁净度和夹杂物控制的影响规律。结果表明,当初渣碱度(CaO/SiO₂的质量比)和钙铝比(CaO/Al₂O₃的质量比)分别为5和1.8时,能将钢中T.O]质量分数降至7.5×10-6,同时夹杂物尺寸控制良好,均小于8 μm,在该渣系条件下,42CrMo钢的精炼效果最好;研究还表明,钢中夹杂物成分受渣系影响较大,特别是钢中夹杂物Al₂O₃含量受渣中Al₂O₃活度影响较大,Al₂O₃活度高的精炼渣渣系去除夹杂物Al₂O₃的能力弱,导致此精炼渣系下钢中夹杂物Al₂O₃含量高。

Effect of refining slag composition on cleanliness of 42CrMo steel

In order to study the effect of different refining slag on the cleanliness and the number and size of inclusions in 42CrMo steel,the influence of a quaternary slag system of CaO-Al₂O₃-SiO₂-MgO on cleanliness and inclusion control in 42CrMo steel was investigated using a slag-steel equilibrium test and FactSage thermodynamics in this research. When the initial slag basicity (the mass ratio of CaO/SiO₂) and the calcium to aluminum ratio (the mass ratio of CaO/Al₂O₃) are 5 and 1.8, respectively, the T.O] content in the steel can be reduced to 7.5×10-6,at the same time, the inclusion size is well controlled, and it is less than 8 μm, according to the findings. The refining effect of 42CrMo steel is the best under this slag system condition. The study also showed that the inclusion composition in the steel was greatly affected by the slag system, especially the Al₂O₃ content of the inclusions in the steel was greatly affected by the activity of Al₂O₃ in the slag, the refining slag system with high Al₂O₃ activity has a weak ability to remove inclusions Al₂O₃, resulting in a high content of inclusions Al₂O₃ in the steel under this refining slag system.