Method for enhancing strip casting quality

Abstract

The invention provides a method for enhancing the strip casting quality. In the method, an enclosed chamber is formed above a molten metal melting pool formed by encircling two casting rollers and a side dam; inert gas is introduced into the enclosed chamber; a slag blocking weir is formed inside the melting pool enclosed chamber, floats in molten steel, is made of a refractory material, and can move upwards and downwards along with the fluctuation of the liquid level of the melting pool; the lowermost part of the slag blocking weir is positioned on the upper part of two phase areas of the molten steel in the melting pool; and floating slag on the surface of the melting pool is isolated from the roller surface of a casting roller by using the slag blocking weir in the melting pool, so that the floating slag is prevented from being involved into a casting strip, and the strip casting quality is improved. The method is suitable for dual roller strip casting production of strip steel with the thickness of 1-5 millimeters.

Description

technical field [0001] The invention relates to continuous casting technology, in particular to a method for improving the quality of thin strip continuous casting. Background technique [0002] Twin-roll strip continuous casting technology is an advanced short-flow metallurgical process. A typical example of this is figure 1 As shown, molten steel is poured directly into a molten pool 5 surrounded by two relatively rotating casting rolls 1a, 1b and side sealing plates 2a, 2b with rapid cooling function. The molten steel in the molten pool is rotated by the casting rolls The circumferential surface is cooled and solidified, and then forms a solidified shell and gradually grows and is squeezed together at the smallest gap between the two crystallization rolls 1a, 1b to form a strip 4, and the roll surface cleaning devices 3, 3' on the outside of the casting rolls Real-time cleaning of oxide impurities on the roll surface. [0003] In the production process of strip continu...

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Problems solved by technology

And the solidification zone should not be in contact with the slag weir, otherwise the solidified slab shell will cause the slag weir to break. In addition, such as the literature "Relationship between the surface state of the continuous casting thin strip and the liquid level of the molten pool" (Yoyuki Uejima: CAMP-ISIJ As mentioned in Vol.5(1992)-1201), if the slag retaining weir is in contact with the molten steel solidification zone, it will seriously affect the quality of the cast strip

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