Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Prevention of Inner Cracks by the Optimum Roller Arrangements in a High Speed Continuous Slab Caster
Kunihiko ONISHIKunio NAGAIToshie HASHIMOTO
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1986 Volume 72 Issue 16 Pages 2225-2232

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Abstract

Concerning a high speed continuous slab caster, strains in a slab were analyzed and a state of loads act on rollers was discussed. From this analysis, the followings were elucidated:
1) The maximum strain in a slab caused by bulging is the component in the casting direction on a inner surface of a shell in a broad side of a slab just under a roller.
2) The allowable roller pitch to prevent internal cracks of a slab caused by bulging becomes much smaller as a temperature of a slab becomes higher. But the influence of a casting speed on the allowable roller pitch is small.
3) Straightening strains in a slab advance not along a designed radius of a machine but along a curvature defined geometrically by a roller arrangement, and the variation of strains of a slab is not linear in a roller pitch and in some cases strain rate becomes very large.
4) For high speed casting, multi-straightening is necessary to prevent internal cracks of a slab caused by straightening strains.
Further, using the results of this investigation, a method of the decision of proper arrangements and constructions of rollers to prevent internal cracks of a slab was systematized.

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© The Iron and Steel Institute of Japan
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