Patent ID: 6179895
Filing Date: 2001-01-30
Classification: B22D,C21C,Y02P

Abstract:
A tundish flux composition for providing a molten protective covering of tundish slag on steel in a tundish and for refining the steel in the tundish to the desired metallurgical condition, comprising:about 10% to about 80% by weight of a solid recycled ladle metallurgy furnace slag comprising, by weight, about 35% to about 65% CaO: about 10% to about 35% Al.sub.2 O.sub.3 ; about 1% to about 10% SiO.sub.2 ; about 3% to about 15% MgO; about 0.3% to about 10% FeO; about 0.1% to about 5% MnO: about 0.01% to about 0.15% P.sub.2 O.sub.5 ; and about 0.1% to about 0.5% S, andabout 20% to about 90% by weight of a raw material selected from the group consisting of a calcium oxide source; a fluorine source; a magnesium oxide source; a carbon source; a silica source; a sodium source; a potassium source; and mixtures thereof, wherein the resultant tundish flux composition comprises by weight about 30% to about 60% CaO, about 5% to about 25% Al.sub.2 O.sub.3 : about 10% to about 40% SiO.sub.2 ; about 5% to about 25% MgO; about 0 to about 10% CaF.sub.2 ; about 0% to about 10% of a mixture of Na.sub.2 O and K.sub.2 O, 0% to about 5% carbon, and 0% to about 2% FeO, wherein the CaF.sub.2 Na.sub.2 O, K.sub.2 O and FeO are not all 0% at the same time.