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Method for starting supply of molten steel

A technology of molten steel and long nozzles, applied in the direction of manufacturing tools, casting melt containers, casting equipment, etc.

Active Publication Date: 2015-03-18
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, in the case of immersion opening, the molten steel surface may also solidify in the inner hole of the shroud when the ladle is replaced (hereinafter also referred to as "skinning"), and the inner hole of the shroud may be blocked to cause the above-mentioned failure.

Method used

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  • Method for starting supply of molten steel
  • Method for starting supply of molten steel
  • Method for starting supply of molten steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Table 1 shows a list of the results of tests conducted to verify the effects of the present invention. The frequency of occurrence of blockage in the table and whether it can be adopted in an actual machine use Comparative Example 1 as a comparison object. Regarding the occurrence frequency of occlusion, those that were improved compared to Comparative Example 1 were set as "good", those that were the same as those of Comparative Example 1 were set as "medium", and those that were worse than those of Comparative Example 1 were set as "poor". ". In addition, regarding the availability of actual machine adoption, the case of usability was set as "good", the case of usable but worse than Comparative Example 1 was set as "medium", and the case of not usability was set as "poor".

[0074] As the shroud 10, a straight pipe type with an inner diameter of 100 mm and a length of 1.5 m was used. However, only Comparative Example 1 used the shroud 10 in which the inner diameter ...

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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.

Description

technical field [0001] The present invention relates to a method for starting the supply of molten steel from a ladle to a tundish during continuous casting, and more particularly to a method for starting the supply of molten steel with the lower end of the shroud immersed in molten steel in the tundish . Background technique [0002] Molten steel decarburized in a refining furnace is poured into a ladle, where secondary refining, etc. are performed. The molten steel after refining is placed on the turntable of the continuous casting machine together with the ladle and placed above the tundish. In the continuous casting operation, a sliding nozzle is provided directly below the upper nozzle for discharging molten steel in the ladle, and a long nozzle is attached to the lower part (lower nozzle) of the sliding nozzle via a supporting device. At this time, the shroud is arranged on the sliding nozzle with some compression so that no gap is generated between the lower part of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D11/10B22D41/46
CPCB22D11/10B22D41/44B22D41/465
Inventor 植田和则铃木秀司福永新一平田秀明
Owner NIPPON STEEL CORP
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