Process for the addition of calcium to molten steel

Details Process for the addition of calcium to molten steel Process for the addition of calcium to molten steel

C - Chemistry, Metallurgy

21

C

53/99

C21C 7/00 (2006.01) C21C 7/064 (2006.01) C21C 7/076 (2006.01) C21C 7/10 (2006.01)

Patent

CA 1069314

Title of the Invention Process for the addition of calcium to molten steel Abstract of the Disclosure Herein disclosed is a process for the addition of calcium to molten steel at an excellent yield and effect. The process is applied to molten steel having a chemical composition of C 0,02 to 0.55%, Si less than 0.50%, Mn 0.20 to 2.50%, usual alloying elements, S less than 0.10%, total oxygen less than 100 ppm and the balance of Fe, and maintained at a temperature of 1480 to 1800°C. The process is conducted by shooting cannon balls of Ca-additive to the molten steel or by continuously feeding a wire of Ca-additive to the molten steel in an amount of 0.1 to 2.0 kg on the basis of pure calcium per tonnage of steel, whereby the calcium content of the resulting steel becomes 0,05 to 0.8 times of the sulfur-content. The resulting steel has an excellent low temperature impact characteristics. - 1 -

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