リムド鋼の凝固途上のガス放出について

概要

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Evolution of gases from rimming-steel ingots during solidification was studied, with the results as follows. (1) Most of gas evolution curves have maximum value, for volume of evolved gases increases at the beginning of solidification and then decreases. The volume of gases and position of maximum value are to be affected by the C, Mn and O_2 content of metals. (2) The main composition of gases are CO (91∿85%), CO_2 (4∿1%) H_3 (4∿11%) and N_2 (0.5∿4%) and during solidification CO and CO_2 decrease, but H_2 and N_2 increase gradually. (3) CO and CO_2 in gases and C or O_2 in molten metal are approximately in equilibrium. (4) Gas pressure of molten metal is about 1.5 atm., and this value is coincident with the presumed value from the ingot structure. Besides, the relation between the gas evolution and ingot structure as well as a probable mechanism of blowhole formation were studied.
社団法人日本鉄鋼協会の論文
1951-11-25