Casting steel strip
OwnerLazar Strezov, Kannappar Mukunthaninventors
Life of this patent
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Abstract
In twin roll casting of steel strip, molten steel is introduced into the nip between parallel casting rolls to create a casting pool supported on casting surfaces of the rolls and the rolls are rotated to deliver solidified strip downwardly from the nip. Casting surfaces are textured by a random pattern of discrete projections at least some of which include peaks having a surface distribution of between 5 and 200 projections per mm2 and an average height of at least 10 microns. The random texture may be produced by grit blasting the casting surfaces on a substrate covered by a protective coating. Alternatively the texture may be produced by chemical deposition or electrodeposition of a coating onto a substrate to form the casting surfaces.
Claims33
A method of continuously casting steel strip comprising the steps of:
- forming casting rolls with textured casting surfaces by grit blasting before a casting campaign is commenced to provide casting surfaces with discrete projections wherein at least some of the projections include peaks having an average surface distribution of between 5 and 200 peaks per mm2;
- supporting a casting pool of molten steel on one or more said formed textured casting surfaces;
- and
- moving the chilled casting surface or surfaces to produce a solidified strip moving away from the casting pool.
An apparatus for continuously casting steel strip comprising:
- forming a pair of casting rolls each with textured casting surfaces by grit blasting before the casting campaign is commenced where the casting surfaces have discrete projections wherein at least some of the projections include peaks having an average surface distribution of between 5 and 200 peaks per mm2;
- assembling the cast rolls with said formed textured casting surfaces into a twin roll caster with the pair of casting rolls horizontally assembled to form a nip between them,
- a molten steel delivery nozzle for delivery of molten steel into the nip between the casting rolls to form a casting pool of molten steel supported on said textured casting roll surfaces immediately above the nip, and
- a roll drive that moves the casting rolls in counter-rotational directions to produce a solidified steel strip delivered downwardly from the nip.
An apparatus for continuously casting steel strip comprising:
- forming a pair of casting rolls before a casting campaign with the each casting roll having textured casting surfaces by grit blasting with discrete projections at least some of which include peaks having an average surface distribution of between 10 and 100 peaks per mm2 and an average height of at least 10 microns with the pair of casting rolls horizontally assembled to form a nip between them,
- a molten steel delivery nozzle for delivery of molten steel into the nip between the casting rolls to form a casting pool of molten steel supported on said textured casting roll surfaces immediately above the nip,
- and a roll drive that drives the casting rolls in counter-rotational directions to produce a solidified steel strip delivered downwardly from the nip.
Dependencies are inferred from the claim text.