Molding powder for continuous casting of steel and method...

Details Molding powder for continuous casting of steel and method... Molding powder for continuous casting of steel and method...

B - Operations, Transporting

22

D

B22D 11/108 (2006.01) B22D 11/111 (2006.01)

Patent

CA 2319476

A molding powder for continuous casting of steel characterized in that it has a chemical composition comprising 25 to 70 wt % of SiO2, 10 to 50 wt % of CaO, 20 wt % or less of MgO and 0 to 2 wt % of F (inevitable impurities), and exhibits a melt viscosity at 1300 ~C of 4 or more; and a method for continuous casting of steel using the molding powder. The molding powder contains fluorine only in a small amount, which results in reducing the corrosion of a continuous casting installation and the fluorine content of waste water, and also allows the stable operation of a continuous casting process.

L'invention concerne une poudre pour moulage d'acier par coulée continue. Cette poudre comprend une composition chimique contenant entre 25 et 70 % en poids de SiO¿2?, entre 10 et 50 % en poids de CaO, au moins 20 % de MgO et entre 0 et 2 % en poids de F (impuretés inévitables). Par ailleurs, cette poudre présente à 1300 ·C une viscosité à l'état fondu de 4 ou plus. L'invention concerne également une procédé de moulage par coulée continue faisant appel à cette poudre. Cette dernière contient du fluor en quantité réduite, ce qui permet de diminuer la corrosion d'une installation de coulée continue ainsi que la teneur en fluor des eaux usées et également d'obtenir un procédé de coulée continue à fonctionnement stable.

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