Apparatus for pouring molten steel
AssigneeHainaut-Sambre S.A.
InventorMichel J. Debaise
Life of this patent
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Abstract
A mounting chassis, fixed by locking pivots to the base plate of a tundish in a continuous casting plant, supports an upper nozzle seated in a refractory brick. A replaceable lower nozzle coaxial with the upper nozzle is held in contact with the upper nozzle by a quick-release ring.
Claims15
Apparatus for pouring molten steel, comprising a molten steel container having a base plate with an aperture and a nozzle seating brick in the aperture, a mounting chassis removably fixed to the underside of the base plate and extending across the aperture, an upper nozzle having an orifice therethrough mounted on the chassis and inserted in the nozzle-seating brick, a removable lower nozzle having an orifice therethrough coaxial with said orifice in said upper nozzle and in contact with the upper nozzle, releasable means engageable with said chassis for maintaining contact between the nozzles, and means for applying a closure member to said orifice of said lower nozzle.
A method of replacing a nozzle in apparatus for pouring molten steel comprising a molten steel container having a base plate with an aperture and a nozzle-seating brick in the aperture, a mounting chassis fixed to the underside of the base plate and extending across the aperture, an upper nozzle mounted on the chassis and inserted in the nozzle-seating brick, a removable lower nozzle which is coaxial with and in contact with the upper nozzle, and releasable means for maintaining contact between the nozzles, the method comprising the sequential steps of;
- (a) applying a closure member to the orifice of the lower nozzle in order to block the orifice completely for a sufficient time to allow the steel within the nozzles to solidify;
- (b) burning off the solidified steel located within the lower nozzle;
- (c) releasing the said releasable means and removing the lower nozzle;
- (d) positioning a new lower nozzle coaxially with and in contact with the upper nozzle and fastening the nozzles together by the said releasable means;
- and
- (e) burning off the solidified steel within the upper nozzle.
Dependencies are inferred from the claim text.