轴承钢精炼过程钢中钛控制的研究

Research on Controlling Titanium Content in Bearing Steel during Secondary Refining

从轴承钢生产工艺特点和质量要求出发,对比工业试验和实际生产数据,分析了控制钢中増钛的主要冶炼工序。根据热力学计算,讨论了钢中氧活度、酸溶铝及炉渣成分对钢中钛含量的影响。结果表明:冶炼过程中主要増钛环节为LF精炼阶段。转炉出钢采用弱脱氧、降低精炼渣碱度、适当降低精炼结束钢中酸溶铝含量可有效减少钢中钛含量。控制转炉炉后钢液中[O]≥20×10-6时,钢中的[Ti]≤20×10-6;控制终点钢中[Al]≤0.018%,渣中Si O2含量不低于6.5%,有利于降低钢液増钛。

Based on the production process characteristics and quality requirements of bearing steel,industrial test and actual production data had been compared to analyze the main metallurgy process which can bring titanium uptaking in the steel.According to thermodynamic calculation the effects of oxygen activity in steel,acid-soluble aluminum and the composition of slag on the titanium content had been investigated.LF refining stage was thought as the main process causing titanium uptaking during steelmaking process.After BOF tapping,the content of titanium can be reduced effectively by using weak deoxidization,reducing the basicity of the refining slag and decreasing the soluble aluminum content in the steel.When the content of oxygen is above 20 × 10-6 after BOF,the titanium content could be controlled below20 ×10-6.When the soluble aluminum content is below 0.018%,the content of SiO2 in slag is above 6.5%,it is beneficial to control titanium uptaking.