| 摘要 |
A mold powder characterized in that, a weight ratio of CaO to SiO2 in the mold powder is within a range of 0.50 to 1.20, the mold powder contains one or two or more species selected from a group consisting of oxides, carbonates, or fluorides of alkali metals, alkaline earth metals, or other metals, and 0.5 to 5 percent by weight of carbon powder, Li2O content is within a range of 1 to 7 percent by weight, F content is within a range of 0.5 to 8.0 percent by weight, crystallization temperature is within a range of 1000 to 1200 DEG C, surface tension at 1300 DEG C is 250 dyne/cm or more, and a relationship between viscosity eta (poise) at 1300 DEG C and casting speed V (m/min) satisfies a range represented by an expression 6.0 </= eta V </= 100.0. By the present invention, there is provided a mold powder which enables stable casting by reducing the likelihood of powder entrapment into the mold without giving rise to surface crack when casting with a thin-slab continuous caster. |
