| 摘要 |
PROBLEM TO BE SOLVED: To provide mold powder of non-Newtonian fluid type and having excellent lubricity which is hardly mixed in molten steel in a mold, and capable of preventing any surface vertical cracking of a cast slab at the same time by gradually cooling the heat release of the cast slab by the mold, and manufactured at lower cost than that of conventional non-Newtonian fluid type mold powder. SOLUTION: The mold powder for continuous casting of steel mainly consists of two or more kinds of substances out of CaO, SiO<SB>2</SB>, Al<SB>2</SB>O<SB>3</SB>, fluorides, and alkaline metal oxides, and further contains ≥0.5 mass% and ≤10 mass% Cr<SB>2</SB>O<SB>3</SB>. Since Cr<SB>2</SB>O<SB>3</SB>is present in the mold powder in a molten state as suspension particles, the mold powder is non-Newtonian fluidized in a molten state. COPYRIGHT: (C)2011,JPO&INPIT |
