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AssigneesIskikawajima-Harima Heavy Industries Company Limited, BHP Steel (JLA) Pty Ltd.
InventorsLazar Strezov, Rama Ballav Mahapatra, Fred de Sylva, Kannappar Mukunthan
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In continuous casting of steel strip, a casting pool of molten metal is supported on moving casting surfaces which are chilled to cause solidification of steel on the casting surfaces. The casting surfaces are textured by provision of parallel groove and ridge formations (11) defining V-shaped grooves (12) and ridges (13) with sharp edges (14). The depth (d) of the texture from ridge peak to groove root is in the range 5 to 50 microns and the pitch (p) between the grooves is in the range 100 to 250 microns. The casting surfaces may be peripheral surfaces of casting rolls of a twin roll caster.
A method of continuously casting steel strip comprising supporting a casting pool of molten steel on one or more chilled casting surfaces and moving the chilled casting surface or surfaces to produce a solidified strip moving away from the casting pool, wherein the or each casting surface is textured by the provision of parallel groove and ridge formations of essentially constant depth and pitch, the depth of the texture from ridge peak to groove root being in the range 5 microns to less than 50 microns, and said pitch being in the range 100 to 250 microns.
Apparatus for continuously casting steel strip comprising a pair of casting rolls forming a nip between them, a metal delivery nozzle for delivery of molten steel into the nip between the casting rolls to form a casting pool of molten metal supported on casting roll surfaces immediately above the nip, and roll drive means to drive the casting rolls in counter-rotational directions to produce a solidified steel strip delivered downwardly from the nip, wherein the casting surfaces of the rolls are textured by the provision of circumferentially extending groove and ridge formations of constant depth and pitch, the depth of the texture from ridge peak to groove root being in the range 5 microns to less than 50 microns, and said pitch being in the range 100 to 250 microns.
Dependencies are inferred from the claim text.