不同浇铸阶段IF钢连铸板坯表层洁净度研究
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- 英文论文题名：Study on the surface cleanliness of IF steel slabs in different casting stages
- 论文作者：韩立磊 ; 张炯明 ; 宋玮 ; 王顺玺 ; 董其鹏 ; 王志通 ; 温鑫
- 英文论文作者：Han Lilei ; Zhang Jiongming ; Song Wei ; Wang Shunxi ; Dong Qipeng ; Wang Zhitong ; Wen Xin ; State Key Laboratory of Advanced Metallurgy ; University of Science and Technology Beijing
- 年：2016
- 作者机构：北京科技大学钢铁冶金新技术国家重点实验室;
- 论文关键词：IF钢 ; 非稳态铸坯 ; 正常坯 ; 洁净度
- 英文论文关键词：IF steel ; unsteady casting slab ; normal slab ; cleanliness
- 会议召开时间：2016-05-19
- 会议录名称：第十九届（2016年）全国炼钢学术会议大会报告及论文摘要集
- 语种：中文
- 分类号：TF777
- 学会代码：ZGJS
- 会议名称：第十九届（2016年）全国炼钢学术会议
- 会议地点：中国湖南长沙
- 主办单位：中国金属学会炼钢分会
- 学会名称：中国金属学会
- 页数：2
- 文件大小：112k
- 原文格式：O
- 会议级别：全国
摘要
运用氧氮分析、无水电解分析、金相分析、扫描电镜及能谱分析等手段,研究了某厂生产的IF钢一个浇次不同浇铸阶段的铸坯(头坯、尾坯、调宽坯、换水口坯和正常坯)表层洁净度。结果表明,头坯T[O]和氮含量最高,开浇时钢水二次氧化和卷渣现象严重,其它非稳态铸坯T[O]和氮含量相对正常坯增加较小,钢水未发生二次氧化,但有不同程度的卷渣现象发生。头坯中大型夹杂物总量最多,为21.98mg/(10kg),其次是尾坯、换水口坯和调宽坯,正常坯中大型夹杂物总量最少,为4.04 mg/(10kg)。非稳态铸坯中含有一定数量的Na、K复合型夹杂物,这是由于非稳态浇铸时结晶器卷渣现象严重造成的。正常坯中显微夹杂物指数最小,为9.82个/mm~2,换水口坯、调宽坯和尾坯中夹杂物指数依次增加,头坯中夹杂物指数最高,为17.95个/mm~2。铸坯中典型显微夹杂物主要包括Al_2O_3、TiN、Al_2O_3-TiN和Al_2O_3-Ti_2O_3。
The surface cleanliness of IF steel slabs in different casting stages of a whole casting process was investigated by oxygen and nitrogen analyzer,non-aqueous solution electrolysis,metallographic examination,SEM,EDS,etc.The slabs of different casting stages include first slab,last slab,width-adjusting slab,SEN-changing slab and normal slab.The results show that T[O]and[N]content in the first slab were the highest of all,T[O]and[N]content in the other unsteady slabs have a slight increase than that in normal slab.It is mainly because the re-oxidization of liquid steel and the phenomenon of mold flux entrapment were very serious,when the continuous casting process starts.For other unsteady casting slabs,liquid steel didn't be re-oxidized during the continuous casting process,though the phenomenon of mold flux entrapment took on slightly.The mass of large-sized inclusions in first slab is the highest,which is 21.98 mg/(10kg),the mass of large-sized inclusions in last slab,SEN-changing slab,and width-adjusting slab decreases successively,while the normal slab have the least mass,which is 4.04 mg/(10kg).Some Na and K complex-inclusions were observed in unsteady casting slabs,this is because the phenomenon of mold flux entrapment was serious during unsteady casting process.The index of micro-sized inclusions in normal slab is the least,which is 9.82/mm2,the index of SEN-changing slab,width-adjusting slab and last slab increases successively,the index of first slab is the most,which is 17.95/mm~2.The typical micro-sized inclusions in slabs mainly include Al_2O_3,TiN,Al_2O_3-TiN and Al_2O_3-Ti_2O_3.
The surface cleanliness of IF steel slabs in different casting stages of a whole casting process was investigated by oxygen and nitrogen analyzer,non-aqueous solution electrolysis,metallographic examination,SEM,EDS,etc.The slabs of different casting stages include first slab,last slab,width-adjusting slab,SEN-changing slab and normal slab.The results show that T[O]and[N]content in the first slab were the highest of all,T[O]and[N]content in the other unsteady slabs have a slight increase than that in normal slab.It is mainly because the re-oxidization of liquid steel and the phenomenon of mold flux entrapment were very serious,when the continuous casting process starts.For other unsteady casting slabs,liquid steel didn't be re-oxidized during the continuous casting process,though the phenomenon of mold flux entrapment took on slightly.The mass of large-sized inclusions in first slab is the highest,which is 21.98 mg/(10kg),the mass of large-sized inclusions in last slab,SEN-changing slab,and width-adjusting slab decreases successively,while the normal slab have the least mass,which is 4.04 mg/(10kg).Some Na and K complex-inclusions were observed in unsteady casting slabs,this is because the phenomenon of mold flux entrapment was serious during unsteady casting process.The index of micro-sized inclusions in normal slab is the least,which is 9.82/mm2,the index of SEN-changing slab,width-adjusting slab and last slab increases successively,the index of first slab is the most,which is 17.95/mm~2.The typical micro-sized inclusions in slabs mainly include Al_2O_3,TiN,Al_2O_3-TiN and Al_2O_3-Ti_2O_3.
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