Patent ID: 7296614
Filing Date: 2007-11-20
Classification: B22D

Abstract:
1. A method of controlling the formation of crocodile skin surface roughness in continuous casting of thin cast strip of plain carbon steel comprising the steps of: assembling a pair of counter-rotating casting rolls laterally to form a nip between circumferential casting surfaces of the rolls through which metal strip may be cast; forming a casting pool of molten metal of carbon steel of less than 0.065% by weight carbon supported on the casting surfaces of the casting rolls above the nip; assembling a rotating brush peripherally to contact the casting surface of each casting roll in advance of contact of the casting surfaces with the molten metal in the casting pool; forming a desired degree of cleaning of the casting surfaces of the casting rolls with a majority of projections on the casting surfaces exposed and provide wetting contact between the casting surface and the molten metal of the casting pool by controlling the energy exerted by the rotating brushes during a casting campaign; controlling the energy exerted by the rotating brushes against the casting surfaces of the casting rolls using the desired degree of cleaning as a reference to expose a majority of projections of the casting surfaces of the casting rolls and provide wetting contact between the casting surface and the molten metal of the casting pool; and counter-rotating the casting rolls such that the casting surfaces of the casting rolls each travel toward the nip to produce a cast strip downwardly from the nip.