Dependence of the Clogging Possibility of the Submerged Entry Nozzle during Steel Continuous Casting Process on the Liquid Fraction of Non-Metallic Inclusions in the Molten Al-Killed Ca-Treated Steel
| Autor: | Weijian Wang, Ying Ren, Lifeng Zhang, Weifu Li, Yi Wang |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
lcsh:TN1-997
Materials science inclusions liquid fraction Nozzle 0211 other engineering and technologies 02 engineering and technology Contact angle Clogging chemistry.chemical_compound Al-killed Ca-treated steels General Materials Science Composite material contact angle lcsh:Mining engineering. Metallurgy 021102 mining & metallurgy Metals and Alloys 021001 nanoscience & nanotechnology Casting Tundish submerged entry nozzle clogging Continuous casting chemistry Non-metallic inclusions Inclusion (mineral) 0210 nano-technology |
| Zdroj: | Metals, Vol 10, Iss 1205, p 1205 (2020) Metals Volume 10 Issue 9 |
| ISSN: | 2075-4701 |
| DOI: | 10.3390/met10091205 |
| Popis: | In the current study, the nozzle clogging behavior and inclusion composition in Al-killed Ca-treated steels were observed to investigate the relationship between the liquid fraction of non-metallic inclusions and the clogging possibility of the submerged entry nozzle. Clogging materials were mainly MgO-Al2O3 with less than 20% liquid phases, while most of the inclusions were full liquid CaO-Al2O3-MgO in tundish at the casting temperature. Thus, it was proposed that the nozzle clogging can be effectively avoided by modification of solid inclusions to partial liquid ones rather than full liquid ones. There was a critical value of liquid fraction of inclusions causing the nozzle clogging. A critical condition of the inclusion attachment on the nozzle wall was a function of cos&theta N&minus S+cos&theta I&minus S< 0. With the increase of T.Ca content in steel, the evolution route of inclusions was solid MgO-Al2O3&rarr liquid CaO-Al2O3-MgO&rarr solid CaS and CaO. To avoid the clogging of the submerged entry nozzle (SEN) under the current casting condition, the appropriate T.Ca concentration range in Al-killed Ca-treated steels can be enlarged from the 100% liquid inclusion zone of 10&ndash 14 ppm to the 20% liquid inclusion zone of 4&ndash 38 ppm. |
| Databáze: | OpenAIRE |
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