非稳态浇铸条件下IF钢铸坯中大型夹杂物分析  

Study on the large-sized inclusions in the unsteady casting slabs of IF steel

作　　者：杨鹤[1] 王洋[1] 崔衡[2] 

机构地区：[1]北京科技大学工程技术研究院,北京100083 [2]北京科技大学钢铁共性技术协同创新中心,北京100083

出　　处：《连铸》2017年第2期39-42,共4页Continuous Casting

摘　　要：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。The large-sized inclusions in the first slab, transfer slab and last slab of IF steel produced by BOF-RH-CC process were studied by means of SLIME, SEM, EDS annlysis, etc. and in addition, the distribution of these inclu- sions was compared with those in the normal slab. The results show that the content of large-sized inclusions in the first slab is the highest, and the average content is 3.15 times of the normal slab. The average content of transfer slab and the last slab is higher than normal slab. The large-sized inclusions more than 300 ~tm only exist in the first and last slab in this test, taking the largest proportion in the head slab, and the highest content in the head slab, the mass fraction is 7.47 X 10 7. All of the large inclusions sized over 80 ~m in the transition slab are more than these in normal slab, which are mainly dominated by the scale of less than 80 pm.Mould slag, refractory material, tundish slag and sand is the main sources of large-sized inclusions in first slab. The main source of large-sized inclusions in last slab and transfer slab is mould slag and tundish slag. The large-sized inclusions in normal slab are nozzle clogging and mould slag.

关 键 词：非稳态浇铸 IF钢 大型夹杂物 

分 类 号：TF777[冶金工程—钢铁冶金]