Research on Submerged Entry Nozzles Clogging During Non-oriented Silicon Steel Casting by CSP Process
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摘要: 国内某厂采用BOF—LF—RH—CSP工艺生产无取向硅钢(Al含量0.3%~0.4%),通过对某一浇次每炉的系统取样(RH喂钙前、RH喂钙后、中间包稳态浇注及铸坯等),并采用光学显微镜观察,SEM分析,以及对水口堵塞物的矿相分析研究等,明确了水口堵塞物的结构和成分,简单阐述了水口堵塞的机理。重点研究了钙处理生成大量含CaS的夹杂物对水口堵塞的影响。通过改进生产工艺,在满足产品质量要求的前提下,使CSP生产无取向硅钢的连浇炉数从5炉提高到8炉及以上,提高了生产率。Abstract: Clogging behavior of submerged entry nozzles during non-oriented silicon steel（with aluminum content of 0.3%~0.4%）casting by BOF-LF-RH-CSP process in a domestic steel mill was investigated.By way of systematical sampling,optical microscope observation,SEM analysis and mineralogical phase analysis,the structure and compositions of the clogging substance were identified and the clogging mechanism was briefly clarified.It was found that the process of Ca treatment,which generated a lot of CaS,was the major factor to clogging.By improving the production process,the sequential heats during non-oriented silicon steel casting by CSP process increased from 5 to 8 or above,resulting in higher production efficiency without sacrificing the requirements of quality.
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Key words:
- non-oriented silicon steel /
- CSP /
- cast /
- clogging of submerged entry nozzles /
- Ca treatment
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