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Submerged entry nozzle

a nozzle and submerged technology, applied in the direction of transportation and packaging, manufacturing tools, liquid transfer devices, etc., can solve the problems of surface defects, surface cracks, surface cracks in finished steel, etc., to improve the flow dynamics of molten steel entering the mold, improve the quality of cast steel, and minimize the effect of steel flow turbulen

Inactive Publication Date: 2006-11-02
NUCOR CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011] The present invention is to a submerged entry nozzle for use in a casting machine to conduct molten steel from the tundish to the mold in a manner that improves the flow dynamics of the molten steel entering the mold, thereby minimizing steel flow turbulence, improving the cast steel quality, and increasing the product yield.
[0012] According to the present invention, a submerged entry nozzle (SEN) includes, within a common housing, an inlet for receiving an incoming flow of molten steel from the tundish, a distribution zone for delivering the molten steel to the mold, and a main body having a central bore which is intermediate to and in fluid communication with the inlet and the distribution zone, the central bore conducting the incoming flow of molten steel along a flow path having sequential section geometries that alternately compresses and decompresses the molten steel flow, to alternately increase and decrease the steel flow velocity to present a substantially laminar primary flow of molten steel at a flow path exit to the distribution zone, thereby minimizing the occurrence of flow turbulence introduced into the mold liquid steel bath by the molten steel delivered thereto. In further accord with the present invention, the flow path includes at least two section geometries that compress the steel flow.

Problems solved by technology

This is where the surface of the final cast product is created, and defects such as surface cracks can form if problems, such as too severe level fluctuations, occur in the liquid surface.
These inclusions can also generate surface defects and surface cracks in the finished steel.

Method used

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Embodiment Construction

[0032]FIG. 1 is a perspective illustration of the submerged entry nozzle, or “SEN”20 of the present invention, which is shown vertically positioned along its longitudinal axis (Z) as in its operational placement between the casting machine tundish and mold. The SEN 20 has a main body 22, with an inlet 24 at one end for receiving liquid steel from a tundish (not shown), and a distribution zone 26 at the opposite end for delivering the liquid steel to the casting machine mold. The inlet 24 is adapted to mate with the output coupling of the tundish, which is generally a circular coupling at a stated diameter. The liquid steel received at the inlet flows through a central bore in the main body 22 (described hereinafter with respect to FIGS. 3 through 10) to the distribution zone 26. The distribution zone 26 channels the flow though interior lateral passages (also described hereinafter with respect to FIGS. 3 through 10) to outlet ports disposed in opposite side segments, or facets 28, 3...

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Abstract

A nozzle for transferring molten steel in a thin slab continuous casting machine from the tundish to the mold which provides at least two areas of stream compression below the major changes in section required to transition from the entry diameter to the rectangular submerged portion of the nozzle.

Description

RELATED APPLICATIONS [0001] This application claims priority from Provisional Patent Application Ser. No. 60 / 594,665, filed Apr. 27, 2005, the entire disclosure of which is incorporated herein by reference.COPYRIGHT [0002] The contents of this document are subject to copyright protection. The copyright owner maintains all rights in copyright to such contents but has no objection to their reproduction in the form published by the United States Patent and Trademark Office. TECHNICAL FIELD [0003] This invention relates to the continuous casting of steel, and more particularly to submerged entry nozzles for use in flowing molten steel between the tundish and mold of a continuous casting machine. BACKGROUND ART [0004] Continuous casting is a steel making process that transforms large volumes of liquid steel into semi-finished slabs, blooms, and billets that can be further processed into finished products. In its operation, liquid steel is supplied by ladle to a casting machine tundish an...

Claims

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Application Information

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IPC IPC(8): B22D37/00
CPCB22D41/50
Inventor MCINTOSH, JAMES L.POLE, MARK C.
Owner NUCOR CORP
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