摘要
针对方坯生产超低碳钢钢水可浇性差和铸坯皮下气泡问题,对水口堵塞物进行分析,结果表明结瘤产物主要为Al_(2)O_(3)。由于上述问题在中包氧含量低时发生频率较高,同时,依据超低碳钢皮下气泡产生原理,中包氧含量高的钢水在凝固时会产生CO气泡,结合生产经验,得出中包氧含量的稳定控制是解决这两类问题的关键。分析了精炼和连铸过程的钢水、钢渣氧化性对中包氧的影响,采取以下控制措施:熔渣FeO质量分数在10%左右;LF炉离站氧质量分数控制在0.0300%~0.0450%,RH离站氧质量分数控制在0.0008%~0.0015%;缩短静置时间、连铸过程保护浇注;中包氧质量分数控制稳定在0.0025%~0.0045%。通过以上措施,单包连浇炉数提高至5炉,同时铸坯表面皮下气泡问题得到有效控制。
To address the issues of poor castability and subsurface bubbles of the billet in the production of ultra-low carbon steel in the billet caster,an analysis was conducted on the water outlet blockage.The findings revealed that the nodulation products were mainly Al_(2)O_(3).The aforementioned issues often appear when the oxygen content in tundish is low.At the same time,according to the principle of subsurface bubbles in ultra-low carbon steel,CO bubbles will be produced in the solidification of molten steel when the oxygen content in tundish is high.Combined with the production experience,it is concluded that the stable control of oxygen content in tundish is the key to solve these two problems.In this research,the influence of oxidation of molten steel and steel slag during refining and continuous casting on oxygen content in tundish was analyzed.The following control measures were taken:the FeO content of slag was maintained at approximately 10%;the oxygen content at the LF furnace station was controlled between 0.0300%and 0.0450%,while the oxygen conten at the RH station was kept between 0.0008%and 0.0015%;the duration of station furnace time was reduced and the continuous casting process adopted protective pouring;the oxygen content in the tundish was stabilised between 0.0025%and 0.0045%.Through these measures,the number of continuous casting furnaces in single ladle has been increased to 5,and the subsurface bubbles on the slab surface have been effectively controlled.
作者
廖扬标
潘艳华
王彦林
仇东丽
刘东清
王书鹏
LIAO Yangbiao;PAN Yanhua;WANG Yanlin;QIU Dongli;LIU Dongqing;WANG Shupeng(Long Product Plant,Wuhan Iron&Steel Co.,Ltd.,Wuhan 430083,Hubei,China;Research Institute,Baoshan Iron&Steel Co.,Ltd.,Wuhan 430083,Hubei,China)
出处
《宝钢技术》
CAS
2024年第4期57-61,共5页
Baosteel Technology
关键词
超低碳钢
方坯
皮下气泡
可浇性
中包氧
连浇炉数
ultra-low carbon steel
billet
subsurface bubble
castability
tundish oxygen
number of continuous casters
