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应用了大样电解、扫描电镜、能谱分析等方法,研究了转炉—RH—连铸工序生产IF钢的头坯、交接坯、尾坯中大型夹杂物的质量分数、粒径、来源,并与正常坯进行了对比。结果表明:非稳态浇铸条件下,头坯的大型夹杂物质量分数最高,平均质量分数是正常坯的3.15倍,其次是交接坯和尾坯,平均质量分数均高于正常坯。本次试验只有头坯和尾坯中发现大于300μm的大型夹杂物,且在头坯中质量分数最高,质量分数为7.47×10-7。交接坯中大于80μm粒径的夹杂物高于正常坯,而正常坯中则以小于80μm的夹杂物为主。头坯中大型夹杂物主要来源于结晶器卷渣、耐火材料、中间包渣、引流砂;交接坯和尾坯中大型夹杂物主要来源于结晶器卷渣、中间包渣;正常坯中大型夹杂物的来源主要是水口结瘤以及结晶器卷渣。
Large mass electrolysis, scanning electron microscopy, energy spectrum analysis and other methods were used to study the mass fraction, particle size and origin of large inclusions in the production of IF steel by converter-RH-continuous casting Compared with the normal blank. The results show that under the condition of unsteady casting, the mass fraction of large inclusions in the billet is the highest, the average mass fraction is 3.15 times that of the normal billet, followed by the billet and tail billet, the average mass fraction is higher than that of the normal billet. In this experiment, only large inclusions larger than 300μm were found in the billet and the tail billet, and the mass fraction was the highest in the billet with a mass fraction of 7.47 × 10-7. The inclusions larger than 80μm in the transfer blank are higher than the normal blank, while the inclusions in the blank are smaller than 80μm. Large inclusions in the billet mainly come from the mold slag, refractories, tundish, and drainage sand; the large inclusions in the billet and tail billet mainly come from the mold slag and the tundish; large inclusions in the normal billet The main source of material is the nozzle nodules and mold roll residue.