Patent ID: 6125919
Filing Date: 2000-10-03
Classification: B22D,C21C,Y02P

Abstract:
A mold powder for continuous steel casting, containing CaO, SiO.sub.2 and fluoride as the main components, wherein the ratio by weight of CaO', represented by the following Equation (X), to SiO.sub.2, CaO'/SiO.sub.2, is 0.9-2.8 and the CaF.sub.2 content represented by the following Equation (Y) satisfies either of the following Condition (A) or (B), and further containing Na.sub.2 O in an amount of 0-25 wt. % and C in an amount of 0-10 wt. %:(A) if CaO'/SiO.sub.2 is not less than 0.9 and not greater than 1.9, the CaF.sub.2 content is 15-60 wt. %;(B) if CaO'/SiO.sub.2 is greater than 1.9 and not greater than 2.8, the CaF.sub.2 content is 5-60 wt. %,whereinCaO'=T.CaO-F.times.(56/38) (X),CaF.sub.2 =F.times.(78/38) (Y),T.CaO: the total Ca content in the mold powder as converted to CaO (wt. %), andF: the total F content in the mold powder (wt. %).