Method for blowing gas from below into molten steel in refining

Details Method for blowing gas from below into molten steel in refining Method for blowing gas from below into molten steel in refining

1979-12-13

1981-05-12

Rosenberg, P. D.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 60, C21C 534

Patent

active

042669707

ABSTRACT:
A method for blowing a gas from below into a molten steel in a refining vessel, which comprises: using a refining vessel including at least one gas blowing aperture provided in the bottom wall thereof and a frustoconical plug matching with said aperture, releasably inserted into said gas blowing aperture, which has a small-diameter bore having a diameter within the range of from 0.5 to 6.0 mm and a length within the range of from 60 to 700 mm; closing the top end of said bore of said plug opening into said vessel with a granular packing easily removable by the pressure of a gas blown, thereby ensuring prevention of a molten steel received in said vessel from penetrating into said bore during receiving said molten steel into said vessel; after receiving a molten steel into said vessel, blowing from below a gas having a pressure of over the static pressure of said received molten steel through said bore of said plug into said molten steel, thereby removing said packing to effect a prescribed gas blowing into said molten steel; and, after discontinuing said gas blowing, causing a portion of said molten steel in said vessel to penetrate by gravity into said bore of said plug to solidify said molten steel in said bore, thereby closing said bore to ensure prevention of said molten steel in said vessel from flowing out from said vessel.

REFERENCES:
patent: 3330645 (1967-07-01), De Moristier
patent: 3343829 (1967-09-01), Coates
patent: 3610602 (1971-10-01), Deacon
patent: 3619172 (1971-11-01), Lutgen

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