US 2008/0257524 A1Published application

Delivery Device and Method for Using the Same

AssigneeDanieli & C. Officine Meccaniche SpA

InventorsNuredin Kapaj, Alfredo Poloni, Fabio Vecchiet

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Abstract

Discharge device for discharging liquid steel into a roller crystallizer for the continuous casting of thin strip capable of reducing turbulence at the meniscus to a minimum so as to eliminate the relative defects on the cast strip by passing the steel between two crystallizer rollers. A relative casting process is also described, said process providing for particular expedients for improving the steel feeding from the tundish to the crystallizer. Advantageously, the feeding of guided steel jet streams inside the nozzle, or delivery nozzle, eliminates the disturbance at the meniscus caused by the air bubbles which form when free-falling jet streams come into contact with the air, as occurs in the known devices and plants.

Claims8

Dependent claims

Discharge device for discharging liquid steel into a crystallizer with two rollers comprising:

a first vessel suitable for containing liquid steel,
a plurality of substantially vertical and aligned ducts provided on the bottom of said first vessel and suitable for generating discharge jet streams of the liquid steel,
a second longitudinal vessel with an upper part open, suitable for receiving in its inside said jet streams, and comprising side walls and a bottom,
characterized in that
said vertical ducts extend inside the second longitudinal vessel whereby said discharge jet streams are guided inside said second vessel,
and in that each of said side walls is provided with a longitudinal slot, having an extension equal to the one of the crystallizer rollers suitable for generating a constant and non-turbulent flow into a casting pool comprised between the two rollers.

3 more elements

Dependencies are inferred from the claim text.