论文部分内容阅读
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0.001 5%以上,氮质量分数高达0.000 5%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29.67mg/(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 study the influence of unsteady casting on the cleanliness of IF steel slabs, IF steel castings under non-steady-state casting conditions were analyzed by gas analysis in steel, composition analysis and large inclusions analysis method Billet sampling analysis, the main analysis of the billet, tail billet and change the billet. The results showed that the contents of TO, N and C in the billet showed an upward trend along the billet direction, with the opposite of Al and Ti. The TO mass fraction of the billet was over 0.001 5% higher than other billet and the nitrogen content was over 0.000 5% Carbon content exceeded the criteria; the maximum level of TO, billet billet TO were 1.6 times and 2.2 times that of the normal billet respectively, and the fluctuation range of nitrogen content was 1.0-1.3 times and 1.5-1.7 times that of normal billet respectively. The carbon content fluctuated Ranging from 1.2-2.4 times and 1.2-2.1 times the normal billet level, respectively, with little fluctuation in other components. The highest content of large inclusions was 34.37 mg / (10 kg) for the first blank and 29.67 mg / (10 kg) for the second blank, Then change the water billet, bale stop casting, and the normal content of large inclusions in the billet are basically 1.24mg / (10kg) below.