Process for making a steel melt for continuous casting

Details Process for making a steel melt for continuous casting Process for making a steel melt for continuous casting

C - Chemistry, Metallurgy

21

C

22/167, 53/78

C21C 5/00 (2006.01) B22D 11/111 (2006.01)

Patent

CA 1078624

Abstract of the Disclosure A process for making a steel melt for continuous casting in which the steel melt is formed in a smelting unit under an iron-oxide-containing slag which is held back while the steel melt is tapped and subjected to deoxidation with silicon or aluminum. The sulfur-containing deoxidized melt is then sub- jected to an aftertreatment with a calcium-containing substance, especially calcium-silicon or calcium carbide in a covered ladle with a silica-free lining after the steel melt is covered with a synthetic slag formed from pulverulent lime and 10 to 30% of a silica-free fluorite and/or alumina fluxing agent which does not release oxygen to the melt. The calcium-containing substance is introduced in an amount which is greater than that required for desulfurization and/or establishing the viscosity of the melt, at a depth of at least 2000 mm and about 300 mm above the bottom of the ladle in a neutral carrier gas (e.g. argon).

254740

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