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Progress in Plasma Processing of Materials, 1997

ISBN:
1-56700-093-2 (Print)

HIGH SPEED STEEL TURNINGS REMELTING IN PLASMA-INDUCTION FURNACE BY ARGON-NITROGEN PLASMA

Mihail K. Mihovsky
“PLASMALAB” - Plasma Metallurgy Research Laboratory, University of Chemical Technology and Metallurgy - Sofia, 8 “Kliment Ohridsky” Blvd., 1156, Sofia, Bulgaria

Tzonio P. Tzonev
University of Chemical Technology and Metallurgy, PLASMALAB, 1156 Sofia, 8 Kl. Ohridsky Blvd., Bulgaria

Biserka I. Lucheva
University of Chemical Technology and Metallurgy, PLASMALAB, 1156 Sofia, 8 Kl. Ohridsky Blvd., Bulgaria

R.I. Petkov
PLASMALAB University of Chemical Technology and Metallurgy – Sofia BULGARIA

K.V. Todorov
PLASMALAB University of Chemical Technology and Metallurgy – Sofia BULGARIA

Abstract

A high-efficiency technology for high speed steel turnings remelting in plasma-induction furnace with inert gas blowing through bottom electrode-anode is developed. Possibilities for nitrogen gas alloying, using argon-nitrogen plasma, is the main subject of this work. The study includes: investigation on electric regime of induction furnace and plasma torch working parameters during the melting process; determination of alloying elements oxidation; investigation on influence of nitrogen blowing through bottom electrode - anode on temperature and chemical composition homogeneity as well as nitrogen content in metal. The advantages of this technology are: using cheap scrap; reduced ferroalloys consumption; alloying steel with nitrogen instead of expensive nitrided ferroalloys; improved quality of final products due to better homogeneity of chemical composition and structure.