Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
Hydrogen Contents of Slag and Ingot in ESR Process
Yasushi NAKAMURAKazu-umi HARASHIMA
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1977 Volume 63 Issue 8 Pages 1235-1243

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Abstract

ESR experiment was made to determine the value of hydrogen distribution between slag and metal, and to clarify operational factors intfluencing the hydrogen content of ingot at a steady state. Compositions of electro-slags used were CaF2-25%Al2O3, CaF2-25%CaO, CaF2-25%CaO-25%Al2O3, CaF2-30%CaO-20%SiO2, and CaF2-30%CaO-10%SiO2-10%Al2O3. Steels of SUS 304 type and S45C type (0.45% carbon steel) were remelted at 200g/min under the water vapour pressure ranging from 1 to 16 Torr.
The experimental result showed that the ratio of the hydrogen content of slag to that of ingot was kept at a constant value during ESR, irrespective of the hydrogen content of electrode and the water vapour pressure. Accordingly, the observed ratio was concluded to be fully close to the equilibrium concentration ratio.
The hydrogen content of ingot at a steady state was found to be expressed as a linear function of two variables: the square root of the water vapour pressure and the hydrogen content of electrode.
This observed linear function was proved to be consistent with an equation derived from a material balance consideration of hydrogen in slag. On the basis of this consistency, the water solubility in slag was evaluated and its dependence on slag composition was discussed.

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© The Iron and Steel Institute of Japan
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