Title:
IMMERSION NOZZLE, MOLD, AND STEEL CONTINUOUS CASTING METHOD
Document Type and Number:
WIPO Patent Application WO/2023/190017
Kind Code:
A1
Abstract:
Provided is a technology for reducing adhesion of inclusions in molten steel to a nozzle, and nozzle erosion, while appropriately controlling a flow of molten steel in a mold. In an immersion nozzle which, when continuous casting of steel is being performed, supplies molten steel from a molten steel storage container into a mold of a continuous caster that performs the continuous casting: an end portion of a nozzle main body, on the side of the immersion nozzle that is immersed into the molten steel in the mold, is closed; one pair of discharge ports having an axis of symmetry along a central axis is provided in each of an upper portion and a lower portion of a part of the nozzle main body that is immersed in the molten steel; and an area of an opening portion of the discharge ports in the lower portion lies in a range of at least 1.0 times and at most 1.6 times an area of the discharge ports in the upper portion. A ratio r/R of an inner diameter r of a flow passage inside the immersion nozzle, from an upper edge of an upper hole of the discharge port to the bottom of a lower edge of the immersion nozzle, to an inner diameter R of the flow passage inside the immersion nozzle, up to the upper edge of the upper hole of the discharge port, is preferably in a range of 0.6 or more to less than 1.0, and the upper portion discharge port and the lower portion discharge port are preferably arranged with an angle θ of 10° or less between discharge directions thereof in a top view.
Inventors:
MORITA SHUGO (JP)
KAWARAZAKI TAKUMI (JP)
TANAKA TOMOHIRO (JP)
ARAMAKI NORICHIKA (JP)
MATSUI AKITOSHI (JP)
KOYANO TETSURO (JP)
CHIYOHARA RYOSUKE (JP)
SANO KEISUKE (JP)
KAWARAZAKI TAKUMI (JP)
TANAKA TOMOHIRO (JP)
ARAMAKI NORICHIKA (JP)
MATSUI AKITOSHI (JP)
KOYANO TETSURO (JP)
CHIYOHARA RYOSUKE (JP)
SANO KEISUKE (JP)
Application Number:
PCT/JP2023/011462
Publication Date:
October 05, 2023
Filing Date:
March 23, 2023
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
B22D11/10; B22D41/50
Foreign References:
| JP2019063851A | 2019-04-25 | |||
| JP2015085370A | 2015-05-07 | |||
| JP2016073990A | 2016-05-12 | |||
| JP4569715B1 | 2010-10-27 | |||
| JPH02295654A | 1990-12-06 |
Attorney, Agent or Firm:
GINZA MARONIE P.C. (JP)
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