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.