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Continuous casting method for molten metal

A molten metal, horizontal technology, applied in the direction of casting equipment, metal processing equipment, casting molten material container, etc., can solve the problem that the stabilization effect of molten metal may not be sufficient

Active Publication Date: 2012-11-14
NIPPON STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0017] However, as a result of further research and development by the present inventors, it is estimated that among the technical elements described in Patent Document 5 and Patent Document 6, the effect of stabilizing the flow of molten metal in the mold is not necessarily sufficient.

Method used

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  • Continuous casting method for molten metal
  • Continuous casting method for molten metal
  • Continuous casting method for molten metal

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example 1

[0094] figure 1 As mentioned above, it is a figure which schematically shows the continuous casting apparatus used for the method of this invention, This figure (a) shows A-A sectional drawing of this figure (b), This figure (b) shows the longitudinal sectional view of a continuous casting machine. The example shown in this figure is an example which satisfies the conditions stipulated in the first invention and the second invention.

[0095] As shown in the figure, the hollow cylindrical refractory structure 1 includes the opening of the side hole, has an inner diameter of 400 mm, an outer diameter of 550 mm, and an overall height of 1200 mm, and is composed of alumina-silicon oxide-based refractories. . That is, the average inner radius R of the opening of the side hole 2 is 200 mm. The height of the molten metal surface in the tundish 5 in the normal operation of continuous casting is in the lower part of 200 mm from the upper end 7 of the refractory structure 1 .

[009...

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Abstract

Provided is a continuous casting method for molten metal, wherein a hollow cylindrical, conical or truncated conical refractory structure provided with one or more side holes in the side wall thereof is disposed above an immersion nozzle in a tundish with the axis of the refractory structure disposed vertically, and molten metal is supplied from the tundish into the immersion nozzle. In said continuous casting method for molten metal, the angle formed by a virtual line extending radially from the center of a circular cross-section in the horizontal direction of the refractory structure and the central axis of the side hole is an angle ([theta]1), the swirling flow of the molten metal supplied into the immersion nozzle is formed by causing the molten metal in the tundish to pass through the side hole, and the flow velocity (Q) of the molten metal, the total opening area (S) of the side hole, the mean internal radius (R) of the circular cross-section in the horizontal direction in a portion in which the side hole is bored, and the angle ([theta]1) satisfy 0.015m2 / s<=RQ / SSin[theta]1<=0.100m2 / s. By providing a swirling flow imparting mechanism in the tundish, the flow of the molten metal in a mold can be stabilized.

Description

technical field [0001] The present invention relates to a technique for applying a swirling flow to molten metal passing through a submerged nozzle in continuous casting of molten metal such as molten steel. The swirling flow applied to the molten metal passing through the submerged nozzle contributes to the stabilization of the flow of the molten metal in the submerged nozzle and the mold. Background technique [0002] In continuous casting using a wide mold such as continuous casting of slabs, molten metal is usually supplied through one submerged nozzle having opposing discharge holes. In this case, the flow in the mold will generate self-excited vibrations, which will cause fluctuations in the flow rate or fluctuations in the surface of the molten metal. As a result, it is required to reduce the casting speed in order to prevent quality defects in the surface layer portion of the cast slab. [0003] Conventionally, for the purpose of controlling the flow in the mold, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D11/10
CPCB22D11/10B22D41/507B22D11/103B22D41/08
Inventor 塚口友一后真理子
Owner NIPPON STEEL CORP
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