Ni Ni STRIP CASTING ROLL FOR MANUFACTURING HIGH NI INVAR STEEL AND MANUFACTURING METHOD FOR HIGH NI INVAR STEEL USING THE SAME

摘要

A twin-roll thin-film casting apparatus of the present disclosure is a twin-roll thin-sheet casting apparatus for casting invar steel containing at least 15% by weight of Ni components, comprising: a casting roll comprising an edge portion having a lower surface roughness, An edge dam provided at both ends of the pair of casting rolls, an immersion nozzle for injecting molten steel into a sump which is a space between a pair of the casting rolls and the edge dams, and an upper portion of the sump to cover the molten- And a meniscus shield which is a supply passage for nitrogen which is a soluble gas and supplies the soluble gas to the sump at a pressure higher than atmospheric pressure of 150 to 250 mmH2O, wherein the surface roughness of the casting roll edge portion , Ra of the surface roughness of the casting roll edge portion is in the range of 13 to 17 mu m, Ra of the surface roughness of the core may be 20um.