Abstract: Bearing steel GCrl5 is produced by hot metal pretreatment- 120 t top and bottom combined blown convert- er-LF-RH-280 mm X 380 mm CC process at Pan Steel. With converter recarburization practice and slag stopping technology during tapping, controlling converter end [C]：0. 03% ~0. 07% , adding deoxidizing agent containing CaC₂ during tapping for pre-deoxidizing, deoxidizing by aluminium after tapping, controlling the basicity (CaO/SiO₂) of LF refining slag 3. 0 ~ 5. 0, and average overheat of liquid steel in tundish = 26. 5℃ , the examination results showed that carbon segregation index was 1.08, average [0] 8x10^-6, [P]≤0. 015%,[S]≤0.011%，and the rating of inclusion in steel met the requirement of standard.

摘要： 攀钢采用铁水预处理-120 t顶底复吹转炉-LF-RH-280 mm×380 mm连铸工艺生产GCr15轴承钢。通过转炉采用挡渣技术和增碳法操作工艺,转炉终点碳0.03%～0.07%,出钢时加入含CaC₂脱氧剂预脱氧,出钢后进行铝脱氧,LF精炼渣碱度CaO/SiO₂3.0～5.0,中间包平均钢水过热度为26.5℃。检验结果表明,铸坯的碳偏析指数为1.08,平均[O]为8×10^-6,[P]≤0.015%,[S]≤0.011%,夹杂物级别满足标准要求。

关键词: 转炉-LF-RH-CC流程, GCr15轴承钢, 冶金质量