Patent ID: 6794600
Filing Date: 2004-09-21
Classification: B22D,H05B,H05H

Abstract:
A plasma torch configured for heating a molten steel, comprising:an outer cylinder including a double tube which has a bottom portion, the bottom portion being annularly blocked; and a bottom cylindrical anode electrode disposed within the outer cylinder such that a gap is provided between the anode electrode and an internal section of the double tube, wherein the anode electrode is composed of a material which excludes pure copper, wherein the material has a softening point that exceeds 150Â° C., and wherein the ratio of an electric conductivity (â€œDâ€ ) of the anode electrode to an electric conductivity (â€œNâ€ ) of the outer cylinder is provided according the following formula: 0.2&lE;D/N&lE;1.0.