METHOD FOR MANUFACTURING STRIP USING TWIN ROLL STRIP CASTER

摘要

PURPOSE: A method for manufacturing a strip using a twin roll strip caster is provided to manufacture the strip by injecting molten metal into a space between two cooling rolls so that the molten metal is rapidly solidified through the contact with the rolls. CONSTITUTION: In a method for manufacturing a strip using a twin roll strip caster consisting of a pair of rolls(1) each of which are rotated oppositely, edge dams which are installed on both side surfaces of the rolls(1) to form a molten steel pool, a meniscus shield(9) supplying an inert nitrogen gas onto the upper surface of the molten steel pool, and a pair of gas knives(8) which are installed in a width direction of the rolls(1) so as to cast the strip, the method comprises the processes of giving a degree of vacuum of 1 torr or more to a roll surface edge part from end parts of the rolls to 0.023 to 0.08 W in which W is a roll widthwise length in a direction of a roll width central part of the surface of the rolls and a roll side part from the surface of the rolls to 0.032 to 0.12 R in which R is a roll radius in a direction of the roll radius center so as to reduce thickness of a gas layer of the roll edge part; and vacuum sucking abrasion powder of the edge dams and oxide scale powder flown into the edge part from the roll side surface part so as to increase cooling capability of the roll edge part, wherein the degree of vacuum is 1 to 0.1 torr.