为研究非稳态浇铸对IF钢铸坯洁净的的影响，用钢中气体分析、成分分析、大型夹杂物分析方法对转炉—RH—连铸工艺生产的非稳态浇铸条件下的IF钢铸坯进行取样分析，主要分析头坯、尾坯和换水口坯。结果表明：头坯TO、N、C含量沿拉坯方向呈现上升趋势，Al、Ti正好相反；头坯TO质量分数平均比其他铸坯高0.0015%以上，氮质量分数高达0.0005%以上，碳含量超过判定标准；尾坯、换水口坯TO水平最高分别为正常坯水平的1.6倍和2.2倍，氮含量波动范围分别是正常坯水平的1.0~1.3倍和1.5~1.7倍，碳含量波动范围分别从正常坯水平的1.2~2.4倍和1.2~2.1倍，其他成分波动不大；大型夹杂物含量最高的是头坯34.37mg/(10kg)，其次是尾坯2967mg/(10kg)，然后是换水口坯、大包停浇坯，而正常坯的大型夹杂物含量基本都在1.24mg/(10kg)以下。
In order to research the impact of unsteady casting process on IF steel slab, the cleanness of IF steel slab of unsteady casting conditions produced by the converter-RH-CC process was investigated by means of gas analysis, chemical composition analysis and big sample electrolysis of first slab, last slab and SEN-changing slab. The results show that TO, N, C content of the first slab rises along with the casting direction while Al and Ti content is just the opposite; average TO content of the whole first slab is 0.0015% higher than other slabs, and N content 0.0005% higher than other slabs, C content exceeds the criteria; the highest TO content of last slab and SEN-changing slab is 1.6 and 2.2 times average level of normal slabs, N content of last slab and SEN-changing slab fluctuation is 1.0-13 and 1.5-1.7 times average level of normal slabs, C content of last slab and SEN-changing slab fluctuation is 1.2-14 and 1.2-2.1 times average level of normal slabs, while other composition of last slab and SEN-changing slab has not very big fluctuation; content of large-sized inclusion of first slab is 34.37mg/(10kg) which is the highest, and then the last slab, and then the SEN-changing slab, ladle-casting-stop slab, content of large-sized inclusion of the normal slab is lower than 1.24mg/(10kg).
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