Patent ID: 6073679
Filing Date: 2000-06-13
Classification: B22D

Abstract:
A method for continuously casting steel strip comprising:introducing a molten silicon/manganese killed carbon steel having a manganese content of not less than 0.20% by weight, a silicon content of not less than 0.10% by weight, a sulphur content of less than 0.02% by weight, and an aluminum content of less than 0.01% by weight, into a metal delivery system comprising a metal delivery nozzle, said metal delivery nozzle consisting of refractory material containing carbon;delivering molten metal through said metal delivery nozzle into a nip between a pair of casting rolls to create a casting pool of molten metal supported on casting surfaces of the rolls immediately above the nip, said molten metal delivery being at a sufficient delivery rate that a lower part of the metal delivery nozzle becomes submerged in said casting pool during casting; andduring a predetermined startup casting period only, providing a sulphur addition such that the sulphur content of the molten steel is at least 0.02% by weight.