Tetsu-to-Hagane
Online ISSN : 1883-2954
Print ISSN : 0021-1575
ISSN-L : 0021-1575
The Deoxidation Behavior of 18-8 Stainless Steel with Si, Mn and Al
Hideo YOSHIDAShoichi KATO
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1977 Volume 63 Issue 9 Pages 1529-1538

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Abstract

Some melts of 18-8 stainless steel of 10kg were deoxidized at 1550°C with (1) Si, (2) Al, (3) Si-Mn, (4) Al after Si-Mn, (5) Si-Mn-Al by using induction furnace. The experimental results were analysed on the basis of thermodynamics and kinetics and summarized as follows:
(1) Oxygen content decreases rapidly until it reaches to 40 ppm in the deoxidation with Al, while some sluggishness of the deoxidation occurs at about 1 to 10min after the addition of Si-Mn, depending on the amount of Si and Mn, and subsequently oxygen content decreases again and reaches to the equilibrium, about 110 ppm with 0.6% Si and 1.6% Mn. These values are consistent fairly well with those of the calculated.
(2) The separation constant of deoxidation, k in (MexOy) %=C0 exp (-kt) becomes smaller, in order of with Al, Si-Mn, Si-Mn-Al, and Si. The difference of the deoxidation behavior between with Al and Si-Mn (depending on Si and Mn contents) is to be interpreted on the characteristic of coalescence of their deoxidation products, i. e., clustering of Al2O3, fused Mn-Silicate, semi-liquid SiO2 and solid Mn-Chromite.

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© The Iron and Steel Institute of Japan
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