宝钢集团五钢公司在 1997年建成了具有国际一流水平的大电炉—炉外精炼—连铸生产线 ,并在该生产线上开发了小方坯连铸轴承钢技术。生产的连铸材的氧化物总量比模铸材减少 2 0 % ,Al2 O3和 Mg O减少 46 %及 36 % ,氧化夹杂物平均直径比模铸少 8%。此外 ,连铸工艺生产的 35 mm In 1997, Baosteel Group Wugang Company built the world-class large electric furnace - furnace refining - continuous casting production line, and developed the billet continuous casting bearing steel technology in this production line. The total amount of oxides produced in the continuous castings decreased by 20%, that of Al 2 O 3 and MgO by 46% and 36% respectively, and that of oxidized inclusions by 8% less than that of die castings. In addition, the continuous casting process produces  35 mm