한국재료학회지 (Korean Journal of Materials Research)

  • 제19권9호
  • /
  • Pages.473-480
  • /
  • 2009
  • /
  • 1225-0562(pISSN)
  • /
  • 2287-7258(eISSN)
한국재료학회 (Materials Research Society of Korea)
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티타늄 첨가강의 연주 노즐막힘 기구

Nozzle Clogging Mechanism in Continuous Casting for Titanium-Containing Steel

  • 정우광 (국민대학교 공과대학 신소재공학부) ;
  • 권오덕 (POSCO 기술연구소 제강연구그룹) ;
  • 조문규 (포항산업과학연구원 원천소재연구본부)
  • Jung, Woo-Gwang (School of Advanced Materials Engineering, Kookmin University) ;
  • Kwon, Oh-Duck (Steelmaking Research Group, POSCO Technical Research Laboratories) ;
  • Cho, Mun-Kyu (New Materials & Components Research Division, Research Institute of Industrial Science & Technology)
  • 발행 : 2009.09.27
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초록

In order to provide the mechanism of nozzle clogging, recovered nozzles for high strength steel grade were examined carefully after continuous casting. The thickness of clogged material in SEN is increased in the following order: from the bottom to the top of the nozzle, upper part of slag line, and the pouring hole. Nozzle clogging material begins to form due the adhesion of metal to nozzle wall, the decarburization, and reduction of oxide in the refractory by Al and Ti in the melt. The reduction of oxide in the refractory by Al and Ti improves the wettability of the melt on the refractory and forms a thin Al-Ti-O layer. Metal containing micro alumina inclusions is solidified on the Al-Ti-O layer, and the solid layer grows due to the heat evolution through the nozzle wall. Thermodynamic calculation has been made for the related reactions. The effect of superheat to the nozzle clogging is discussed on ultra low carbon steel and low carbon steel.

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참고문헌

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