Simple ladle refining method
AssigneeNippon Steel Corporation
InventorsShinya Kitamura, Ken-ichiro Naito, Hikofumi Taniishi
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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 (d0/dt) of a nozzle outlet diameter d0 (mm) to a nozzle throat diameter dt (mm) of from 1.2α to 2.5α wherein α is defined as a function of a back pressure.
Claims7
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 (d0/dt) of a nozzle outlet diameter d0 (mm) to a nozzle throat diameter dt (mm) of from 1.2α to 2.5α wherein α is calculated by the formula (1):
- α=[(1/M·{(1+0.2×M2)/1.2}3]½ (1)
- wherein M={5×(P{fraction (2/7)}−1)}½ wherein P is a back pressure (kgf/cm2, absolute pressure).
Dependencies are inferred from the claim text.