ステンレス鋼浴の減圧下における脱炭反応挙動に関する研究

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This study has been undertaken to clarify the decarburization phenomena of liquid stainless steel under reduced pressure. The study has been especially directed towards determining the rate-controlling steps of decarburizing reaction. A series of stainless melts containing 0.20-0.30% carbon has been made in a laboratory-scale vacuum induction furnace and decarburized by blowing or bubbling the different oxygen potential gases such as CO_2, Ar-O_2 mixture gas and pure O_2 gas or by adding iron oxide on the surface of the melt at 1550℃-1620℃ under 30-400 Torr and the change in C___-, <Cr>___- and O___- contents was observed. The aspects of the mechanism of decarburization of molten stainless iron under the reduced atmosphere are summarized as follows ; (1) The decarburization by CO_2 blowing that is low oxygen potential, is controlled by the mass transfer in gas site. (2) On the other hand, the decarburization by blowing or bubbling Ar-O_2 mixture gas and O_2 is conceived to be carried on according to following reaction model. C__-+1/2O_2(g)⟶CO(g)……(1) xM__-+y/2O_2(g)⟶MxOy……(2) MxOy⟶xM__-+yO__-……(3) C__-+O__-⟶CO(g)……(4) The oxygen for decarburization is considered to be transfered into the melt as metallic oxide following equations (2) and (3). This reaction model could well explain the decarburization phenomena which were observed when direct addition of iron oxide was made into the melt. From the above-mentioned results, it can be concluded that the increase in the reaction interface area by forming gas bubbles and promoting the stirring of the melt are beneficial in achieving the vacuum decarburization for stainless steel efficiently.
社団法人日本鉄鋼協会の論文
1973-08-01

ステンレス鋼浴の減圧下における脱炭反応挙動に関する研究

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