Patent ID: 6315809
Filing Date: 2001-11-13
Classification: B22D

Abstract:
A mold powder for thin-slab continuous casting of steel comprisinga weight ratio of CaO to SiO.sub.2 in said mold powder is within a range of 0.50 to 1.20;said mold powder contains one or more species selected from the group consisting of oxides, carbonates, or fluorides of alkali metals, alkaline earth metals and metals selected from the group consisting of Mn, Al, Mg, Ti, Zr and B, and 0.5 to 5 percent by weight of carbon powder;Li.sub.2 O content is within a range of 1 to 7 percent by weight;Fluorine content is within a range of 0.5 to 8.0 percent by weight;crystallization temperature is within a range of 1000.degree. C. to 1200.degree. C.;surface tension at 1300.degree. C. is 250 dyne/cm or more; anda relationship between viscosity .eta. (poise) at 1300.degree. C. and casting speed V (m/min) satisfies a range represented by an expression:6.0.ltoreq..eta.v.ltoreq.100.0.