| 摘要 |
PROBLEM TO BE SOLVED: To stabilize viscosity of mold powder in which gehlenite, akermanite or melilite which is the complete solid solution of both crystallizes or is precipitated, and to increase lubricity in a mold. SOLUTION: Regarding the mold powder for continuous casting of steel having a composition in which, by mass, CaO/SiO<SB>2</SB>is 1.1 to 1.5%, the content of F is <5%, also, the contents of F, Na<SB>2</SB>O and Li<SB>2</SB>O expressed by F-0.613×Na<SB>2</SB>O-1.27×Li<SB>2</SB>O are 0 to 1.8%, the content of Al<SB>2</SB>O<SB>3</SB>is 10 to 25%, also, Al<SB>2</SB>O<SB>3</SB>+MgO is 15 to 30%, and the content of TiO<SB>2</SB>is <7%, and in which the main crystals with a molecular weight of <500 crystallizing or precipitated in the case annealing is performed after temporary melting are composed of gehlenite, akermanite or melilite, and the crystals secondarily crystallizing or precipitated are cuspidine, and solidifying temperature is 1,050 to 1,220°C. According to this invention, the mold powder having excellent characteristics of being hardly involved in molten steel can be applied to wide steel kinds. COPYRIGHT: (C)2007,JPO&INPIT
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