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首页> 外文会议>TMS annual meeting exhibition;International symposium on high-temperature metallurgical processing >STUDY ON KEY TECHNOLOGIES OF 38CrMoAl STEEL PRODUCED BY BOF-LF-RH-CC PROCESS
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STUDY ON KEY TECHNOLOGIES OF 38CrMoAl STEEL PRODUCED BY BOF-LF-RH-CC PROCESS

机译：转炉LF-RH-CC工艺生产38CrMoAl钢关键技术研究

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摘要

Nozzle clogging is easy to occur in continuous casting process when 38CrMoAl steel with high Al content ([Al]=0.7-1.1%) is produced. Slag-steel reaction will lead to a large change of steel compositions and slag properties when molten steel is refined by the traditional high SiO_2 slags, and also affect the cleanness of liquid steel. According to the analysis on the characteristics of refining process and continuous casting, new refining slag and tundish covering powder were developed for the high Al steel, and the cleanness was improved with the [Si] and [Al] contents being controlled accurately. The mold powder with high basicity and vitrification was also developed to guarantee the slag stability after absorbing alumina inclusions. Stable continuous casting can be carried out by using slag washing, controlling the inclusion morphology, and using seal ring and argon blowing in continuous casting process. The practical operation shows that when the [Si], [Al] and [S] contents are 0.25%-0.40%, 0.80%-1.00%, and below 0.004%, respectively, more than 6 heats of 38CrMoAl can be continuously casted with the total oxygen and nitrogen contents lower than 15 ppm and 50 ppm respectively.
机译：当生产高铝含量（[Al] = 0.7-1.1％）的38CrMoAl钢时，在连续铸造过程中容易发生喷嘴堵塞。用传统的高SiO_2高炉渣精炼钢水时，炉渣-钢反应会导致钢成分和炉渣性能发生较大变化，并影响钢水的清洁度。根据对精炼工艺和连铸特性的分析，为高铝钢开发了新的精炼炉渣和中间包覆盖粉，并通过精确控制[Si]和[Al]含量提高了清洁度。还开发了具有高碱度和玻璃化度的防霉粉，以确保吸收氧化铝夹杂物后的炉渣稳​​定性。可以通过渣洗，控制夹杂物形态，在连续铸造过程中使用密封环和吹氩来进行稳定的连续铸造。实际操作表明，当[Si]，[Al]和[S]的含量分别为0.25％-0.40％，0.80％-1.00％和0.004％以下时，可以连续浇铸6炉以上的38CrMoAl钢。总氧和氮含量分别低于15 ppm和50 ppm。

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