18-8 ステンレス鋼の Si, Mn および Al による脱酸挙動

概要

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Some melts of 18-8 stainless steel of 10kg were deoxidized at 1550℃ 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 40ppm 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 110ppm 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 (Me_xO_y)%=C_o 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 Al_2O_3, fused Mn-Silicate, semi-liquid SiO_2 and solid Mn-Chromite.
社団法人日本鉄鋼協会の論文
1977-08-01