Abstract: At present,the oxygen content in bearing steel has been controlled at a very low level,and Ds inclusions have become one of the main factors affecting its quality stability.In order to solve this problem,a non-aluminum deoxygenation process is proposed to produce CCr15 bearing steel.Instead of using aluminum as deoxidizer,silicon-manganese pre-deoxidation,slag surface diffusion deoxidation,vacuum final deoxidation and low basicity slag formation in refining process are adopted. Compared with the traditional aluminum deoxidation production process,the main inclusions in the bearing steel of non-aluminum deoxidation process are silicate with a small amount of calcium aluminum-silicon composite inclusions, which reduces the magnesium aluminum spinel and calcium aluminate forming Ds inclusions,and significantly reduces the number of Ds inclusions.Ds inclusions can be stably controlled below grade 0.5 in rolled products,and the proportion of samples graded at grade O is as high as 91.67%.This process can obtain stable production results and product quality, which will provide theoretical and technical guidance for the production of high-quality bearing steel.

Key words: Non-aluminum Deoxidation, GCr15 Bearing Steel, Ds Inclusions, the Whole Process, High-quality Steel

摘要： 当前在轴承钢中氧含量已经能够控制在极低水平的情况下，Ds类夹杂物成为影响其质量稳定性的主要因素之一。为解决这一问题，本研究提出了利用非铝脱氧工艺，不使用铝作为脱氧剂，而采用硅锰预脱氧、渣面扩散脱氧、真空终脱氧、精炼过程造低碱度渣的方式生产GCr15轴承钢。与传统铝脱氧生产工艺相对比，非铝脱氧工艺轴承钢中主要夹杂物为硅酸盐，含有少量钙铝硅复合夹杂物，减少了形成Ds类夹杂物的镁铝尖晶石和钙铝酸盐，显著降低了Ds类夹杂物的含量，在轧材中能够将Ds类夹杂物稳定控制在0.5级以下，评级为0级的样品占比高达91.67%。该工艺能够获得稳定的生产效果和产品质量，并为高品质轴承钢生产提供理论及技术指导。

关键词: 非铝脱氧, GCr15轴承钢, Ds类夹杂物, 全流程, 高品质钢