Title:
METHOD FOR STARTING SUPPLY OF MOLTEN STEEL
Document Type and Number:
WIPO Patent Application WO/2014/002252
Kind Code:
A1
Abstract:
This method for starting the supply of molten steel comprises: an introduction step for introducing a heat-generating gasifying substance into a long nozzle from an opening in the upper end part of the long nozzle, the lower end part of the long nozzle being immersed in molten steel in a tundish; a coupling step for coupling the upper end part of the long nozzle with a sliding nozzle across a seal member after the introduction step, the sliding nozzle being in communication with a discharge hole in the bottom surface of a ladle, the sliding nozzle controlling the flow rate of the molten steel that flows down from the ladle; a long-nozzle inner-pressure verification step for verifying the generation of air bubbles on the molten steel surface in the tundish after the coupling step; and a dropping step for dropping, into the long nozzle via the sliding nozzle, filling sand in the discharge hole after the long-nozzle inner-pressure verification step. The immersion depth (L) of the lower end part of the long nozzle with respect to the molten steel surface during the introduction step is 50-350 mm.
Inventors:
UEDA KAZUNORI (JP)
SUZUKI SHUJI (JP)
FUKUNAGA SHINICHI (JP)
HIRATA HIDEAKI (JP)
SUZUKI SHUJI (JP)
FUKUNAGA SHINICHI (JP)
HIRATA HIDEAKI (JP)
Application Number:
PCT/JP2012/066688
Publication Date:
January 03, 2014
Filing Date:
June 29, 2012
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
UEDA KAZUNORI (JP)
SUZUKI SHUJI (JP)
FUKUNAGA SHINICHI (JP)
HIRATA HIDEAKI (JP)
UEDA KAZUNORI (JP)
SUZUKI SHUJI (JP)
FUKUNAGA SHINICHI (JP)
HIRATA HIDEAKI (JP)
International Classes:
B22D11/10; B22D41/46
Foreign References:
| JPS59125250A | 1984-07-19 | |||
| JPS63137553A | 1988-06-09 | |||
| JPH01133664A | 1989-05-25 |
Attorney, Agent or Firm:
SHIGA Masatake et al. (JP)
Masatake Shiga (JP)
Masatake Shiga (JP)
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