Method of desulfurization of a steel melt
AssigneeThyssen Niederrhein AG Hutten- und Walzwerke
InventorsEckehard Forster, Helmut Richter, Edgar Spetzler, Jochen Wendorff, Wilhelm Klapdar, Heinrich-Wilhelm Rommerswinkel
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Abstract
A steel melt is confined and subjected to a partial vacuum. A particulate additive is entrained by a neutral nonreactive carrier gas and introduced into the melt below the surface thereof at a depth such that the additive is immediately vaporized and rises toward the surface of the melt in the form of bubbles which react with components of the melt. With particulate calcium as the additive an injection depth 1500 mm, a temperature of approximately 1500.degree.C, and a vacuum of 20 Torr allows the sulfur content of a steel melt readily to be reduced below 0.005% by weight.
Claims5
A method of desulfurizing a ferrous melt comprising the steps of applying suction to the upper surface of said melt to subject it to subatmospheric pressure of substantially 15 to 25 Torr;
- simultaneously introducing a particulate additive consisting essentially of calcium and vaporizable at the temperature of said melt into said melt at a depth of substantially 1200 to 1800 mm below said surface thereof permitting vaporization of said additive;
- and vaporizing the introduced additive at the melt temperature while suction continues to be applied at said upper surface.
Dependencies are inferred from the claim text.