Patent Number: 6,309,443

Title: Simple ladle refining method

Abstract: The present invention provides a simplified ladle refining process capable of efficiently heating a molten steel in a short period of time while scattering and adhesion of splashes and erosion of refractories are suppressed. A simplified ladle refining process for refining a molten steel in a ladle comprising inserting an immersion snorkel into a ladle and blowing an oxidizing gas onto the surface of a molten steel within the immersion snorkel through a lance while the molten steel is being stirred by blowing an inert gas through the bottom of the ladle, wherein the lance has a ratio (d.sub.0 /d.sub.t) of a nozzle outlet diameter d.sub.0 (mm) to a nozzle throat diameter d.sub.t (mm) of from 1.2.alpha. to 2.5.alpha. wherein .alpha. is defined as a function of a back pressure.

Inventors: Kitamura; Shinya (Futtsu, JP), Naito; Ken-ichiro (Futtsu, JP), Taniishi; Hikofumi (Kitakyushu, JP)

Assignee: Nippon Steel Corporation

International Classification: C21C 7/072 (20060101); C21C 7/068 (20060101); C21C 005/35 ()

Expiration Date: 10/30/2018