RH真空精炼后IF钢镇静工艺的洁净度研究

为了优化RH处理工艺，提高RH精炼后的IF钢水洁净度，通过分析T[O]含量和夹杂物含量的变化研究了钢水镇静（静置）时间对IF钢洁净度的影响.研究表明，随着镇静时间的延长，中间包钢液中T[O]含量和夹杂物数量总体呈先下降后回升的趋势.在30min到40min的镇静时间区间里，中间包内钢液试样T[O]含量基本稳定，所分析炉次中只有4.76%炉次T[O]超过30×10^-4%.在该厂现行工艺条件下，镇静时间在30 min到40 min的时段内的钢液洁净度水平较高.

Cleanliness study of IF steel by holding in ladles after RH vacuum process

The influence of the holding time of molten steel in the ladle after RH vacuum process on the T[O] content and nonmetal inclusion content of interstitial-free(IF) steel in the tundish was studied to optimize the RH process parameters and improve the cleanliness of IF steel after RH treatment. Experimental results show that as the holding time increases,the T[O]and non-metal inclusion contents decrease at first and then increase. The T[O]content is basically steady below 30×10^-4% in the holding time range of 30 min to 40 min except for 4.76% of heats. It is suggested that under current process conditions,the steel mill should control the holding time between 30 min and 40 min.