Asea Ab

Jernkontoret

Jernjontoret

Lars Tiberg

Hasse Fredriksson

Sten Kollberg

A method for preventing segregations in continuous casting by deforming the continuous strand plactically during the solidification in such a way that the cross-sectional area of the strand is physically reduced on a mount corresponding substantially to the solidification and cooling shrinkage of the material along the solidifying strand length. The method avoids upward or downward transport of melt in the solidifying strand. The reduction in most cases will be 2-6% and can be accomplished with apparatus having a number of pairs of strand reducing rolls or jets along the strand, to reduce it a number of times, each time less than the total desired reduction. The degree of reduction of the strand from casting to the final strand corresponds to the solidification and cooling shrinkage.

Method of preventing formation of segregations during continuous casting

A method for preventing segregations in continuous casting by deforming the continuous strand plastically during the solidification in such a way that the cross sectional area of the strand is physically reduced corresponding substantially to the solidification shrinkage of the metal. The method avoids upward or downward transport of melt in the solidifying strand. The reduction in most cases will be 2-6% and can be accomplished with apparatus having a number of pair of strand reducing rolls or jets along the strand, to reduce it a number of times, each time less than the total desired reduction. The reduction of the strand from casting to the final strand follows the solidification shrinkage.

Method at continuous casting of steels and metal alloys with segregation

A valve device for metallurgical containers includes an electric circuit formed by two electrodes opening out into the molten metal at the tapping point. The electric circuit measures the resistive voltage drop across the molten metal at the tapping point to determine the slag content in the tap stream by changes in the measured resistive voltage drop. The rate of tapping of the melt can be controlled simultaneously along with the indication of the presence of slag in the tap stream.

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Fagersta, Sweden

Lars Tiberg