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针对高速重轨钢精炼过程的脱氧、夹杂物控制和脱氢进行了理论分析,并结合工艺实践,对精炼过程中的炉渣碱度和精炼时间等进行了研究.理论分析表明,炉渣碱度高有利于重轨钢在LF精炼时脱氧,欲控制重轨钢中生成2CaO.Al2O3.SiO2,应尽量控制钢中的Ca和Al含量.工艺实践表明,在RH精炼时全氧含量和氢含量在15min左右已趋于稳定,炉渣碱度对脱氧无明显影响,但碱度高会有脆性夹杂物生成.建议高速重轨钢的精炼可以在LF精炼时采用较高碱度(2.5～3.0),在RH精炼时控制较低的炉渣碱度(2.0左右),同时控制RH精炼时间在15 min即可达到脱氢脱氧和控制夹杂物的目的.
According to the theoretical analysis of deoxidation, inclusion control and dehydrogenation in the process of high-speed heavy rail steel refining, the basicity of slag and the refining time in the process of refining are studied with the practice of the technology.The theoretical analysis shows that the high basicity Is conducive to heavy rail steel deoxidation LF refining, want to control the heavy rail steel to generate 2CaO.Al203.SiO2, should try to control the content of Ca and Al steel. Process practice shows that RH refining oxygen content and hydrogen content in the 15min or so has been stabilized, slag basicity has no obvious effect on deoxidation, but high alkalinity will have brittle inclusions.It is suggested that the refining of high speed heavy rail steel can adopt high alkalinity (2.5 ~ 3.0) in LF refining, In the RH refining control of the lower slag basicity (2.0 or so), while controlling the RH refining time at 15 min to achieve the purpose of dehydrogenation and oxygen control inclusions.