Abstract: The tested bearing steel 9Cr18Mo (/% ： 0.98C, 0.21 Si, 0.32Mn, 0.005P, ＜0. 001S, 16.95Cr, 0.51Mo) is melted by 500 kg vacuum induction melting furnace (VIM) -electroslag remelting unit (ESR) -vacuum arc remelting unit (VAR) triplex process, forged breakdown and rolled to Φ30 mm bar products. The gas content, deleterious elements content and non-metallic inclusions in steel 9Crl8Mo are examined and analyzed. Results show that the triplex process is available to increase the cleanliness of bearing steel, the oxygen content in tested steel 9Cr18Mo is 0.0008% , nitrogen content is 0.0038% and the S content is ＜0. 001 % , and with controlling the Ti content and pentad-deleterious elements content in raw materials, in finished products the Ti content is ＜0.002% , the Sn, As and Sb content are respectively ＜0.002% and the Pb and Bi content are respectively ＜0.0001 % ； by triplex process the nonmetallic inclusions in steel is a little, and the inclusions with size less than 3μm amount are more than 90% of total inclusions up to quite high cleanliness level.Material Index Bearing Steel 9Cr18Mo, Cleanliness, VIM-KSR-VAR Triplex Melting Process, Inclusions.

摘要： 试验9Cr18Mo轴承钢(/%:0.98C,0.21Si，0.32Mn，0.005P，＜0.001S，16.95Cr，0.51Mo)经500 kg真空感应炉(VIM)-电渣重熔(ESR)-真空自耗重熔(VAR)三联工艺冶炼,锻造开坯并轧成Φ30 mm棒材。试验和分析了9Cr18Mo钢中的气体、有害元素的含量和非金属夹杂物。结果表明，三联工艺是提高轴承钢洁净度的有效方法，试验9Cr18Mo钢中氧含量0.0008%，氮含量0.0038%，硫含量＜0.001%，通过控制原材料的Ti和五害元素含量，成品材中Ti＜0.002%，Sn，As和Sb分别＜0.002%,Pb和Bi分别＜0.000 1%;三联工艺钢中非金属夹杂物数量少，90%以上的夹杂物尺寸小于3μm，达到了很高的洁净度水平。

关键词: 9Cr18Mo轴承钢, 洁净度, VIM-ESR-VAR三联冶炼工艺, 夹杂物