Effective boron alloying additive for continuous casting fine grain boron steels
AssigneeFoote Mineral Company
InventorMaharaj K. Koul
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Abstract
An effective alloying additive for adding small (5-30 ppm) quantities of boron to steel which is continuously cast, said additive containing 0.5-1.5% boron, 8-15% calcium, 8.5-20% titanium, 40-60% silicon, up to 1.5% of aluminum, and balance iron. The additive makes possible continuous casting of boron steel without the tundish nozzle-clogging problem associated with aluminum-killed steel, and the cast steel contains sufficient soluble boron to provide a good hardenability effect.
Claims3
A boron alloying additive for continuous casting of boron steel consisting essentially of from about 0.5 to about 1.5 percent boron, from about 8 to about 15 percent calcium, from about 8.5 to about 20 percent titanium, up to about 1.5 percent of aluminum, from about 40 to about 60 percent silicon and balance iron, said percentages being by weight, based on the total weight of said alloy.
Dependencies are inferred from the claim text.