Method and device for the continuous casting of killed steel with artificial wildness

Claim 2

In a method for the continuous casting of killed steel into a mold by means of a tubular member reaching downwardly into the mold, wherein an inert gas is blown into the mold simultaneously with the molten steel, the improvement comprising blowing said inert gas into the top portion of the ingot being cast through the mold side walls just under the top surface of the ingot being cast and above the layer of steel hardening on the inner surface of the mold walls so that a continuous wave is formed and sustained in said top surface of the ingot being cast, said continuous wave washing impurities in the molten steel to the surface of the ingot being cast to thus prevent the concentration of impurities at the interface between the hardening steel and the still liquid steel.

Claim 3

In an apparatus for the continuous casting of killed steel into a mold having elongated side walls and short side walls, and a melt discharging nozzle closed at its lower end and reaching downwardly into the mold substantially intermediate said short mold side walls, said melt discharging nozzle having two substantially horizontally directed melt discharging openings adjacent to said lower end of said nozzle, each of said melt discharging openings facing its respective short side wall, the improvement comprising means in said side walls of the mold for injecting an inert gas into the molten metal just under the top surface of the ingot being cast, and above the layer of steel hardening on the inner surface of the mold walls for creating a continuous wave in the surface of an ingot being cast, whereby impurities are continuously washed to the surface and thus prevented from concentrating at the interface between the hardening steel and the still liquid steel.

Claim 4

In an apparatus for the continuous casting of killed steel into a mold having elongated side walls and short side walls, and a melt discharging nozzle closed at its lower end and reaching downwardly into the mold substantially intermediate said short mold side walls, said melt discharging nozzle having two substantially horizontally directed melt discharging openings adjacent to said lower end of said nozzle, each of said melt discharging openings facing its respective short side wall, the improvement comprising means in said side walls of the mold for injecting an inert gas into the molten metal just under the top surface of the ingot being cast, and above the layer of steel hardening on the inner surface of the mold walls for creating a continuous wave in the surface of an ingot being cast, whereby impurities are continuously washed to the surface and thus prevented from concentrating at the interface between the hardening steel and the still liquid steel.

Claim 5

The apparatus according to claim 2, wherein said means for injecting an inert gas comprise conduits extending through said side walls, said conduits being upwardly inclined.

Claim 6

The apparatus according to claim 2, wherein said means for injecting an inert gas comprise porous ingot side wall portions at the upper end thereof.