Hot rolling thin strip

Abstract

A thin steel strip is passed through a pinch roll stand comprising pinch rolls to a hot rolling mill comprising work rolls and backing rolls. In advance of rolling mill, the strip passes over support rolls. An anti-crimping guide roll located immediately in advance of the rolling mill is mounted on a pair of rocker structures so as to be rasiable from a lower inoperative position to lift the strip out of a straight line path so as to pass around the anti-crimping roll and to be wrapped about the upper work roll, that roll supports the strip and resists buckling of the strip and the generation of crimping defects.

Description

technical field [0001] The present invention relates to the hot rolling of thin steel strip and has particular but not exclusive application to the in-line hot rolling of thin steel strip produced by twin roll steel strip casters. Background technique [0002] Recent developments in twin roll strip casting have enabled the production of strip thicknesses of the order of 5 mm or less. This steel strip can be further reduced in thickness by thinning in an in-line hot rolling mill as the strip is produced by the casting machine. It has been found that when the thickness of the hot rolled strip is around 3mm or less, significant defects in the strip arise due to the coiling of the strip material as it enters the thinning rolls. This curl defect can be small and appears as a visible curve on the strip surface. However, especially when rolling very thin strips, the coiled portion of the strip becomes folded together before rolling so that this portion of ...

AI Technical Summary

Problems solved by technology

[0004] Strip crimp is affected by strip tension and in some applications it is possible to control curl defects by utilizing greater strip tension

However, it is not always possible to utilize large stretches in very thin steel strips at high temperatures

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