Plasma torch used for heating molten steel

H - Electricity – 05 – H

Patent

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Details

H05H 1/34 (2006.01) B22D 11/10 (2006.01) B22D 11/11 (2006.01) B22D 41/01 (2006.01) B22D 41/015 (2006.01) H05B 7/00 (2006.01) H05B 7/18 (2006.01) H05H 1/28 (2006.01) H05H 1/48 (2006.01)

Patent

CA 2437591

A plasma torch 20a used for heating a molten steel has an outer cylinder 26 composed of a double tube 21, the bottom of which is blocked annularly, and a bottomed cylindrical anode electrode 28 that is installed within the outer cylinder 26 with a gap existing between the anode electrode 28 and the inside of the double tube 21, the plasma torch being characterized in that pure copper is not used as a material for the anode electrode 28, the material has a softening point exceeding 150°C, and the ratio of an electric conductivity D of the anode electrode 28 to an electric conductivity N of the outer cylinder 26 satisfies the formula: 0.2 <= D/N < 1Ø The plasma torch prevents the melting loss and wear of the anode electrode caused by the splashes and the heat produced in the anode electrode, suppresses generation of a side arc, shows an extended life, and stabilizes the casting operation and improves the quality of the slab.

La présente invention concerne un chalumeau à plasma (20a) permettant de chauffer de l'acier en fusion. Ledit chalumeau comprend un tube extérieur (26) à tubes coaxiaux (21) à fond annulaire, et une électrode d'anode (28) à fond tubulaire fixée au tube extérieur (26) à travers un espace situé à l'intérieur du tube coaxial (21), l'électrode d'anode (21) étant composée d'une matière présentant une température de ramollissement supérieure à 150 °C excepté pour le cuivre pur, et le rapport de conductivité électrique D de l'électrode d'anode (28) avec la conductivité électrique N du tube extérieur (26) obéit à la relation 0,2 </= D/N </= 1,0. On prolonge la durée de vie du chalumeau à plasma en empêchant la perte à la fusion ou à l'usure dues à la chaleur ou à la projection se produisant dans l'électrode d'anode et en supprimant la génération d'arc latéral, ce qui permet de stabiliser ainsi l'opération de coulage tout en favorisant la qualité d'une pièce coulée.

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