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

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