A Consideration on Decarburization in the Oxygen Converter of Unburned Gas Recovery System.

Kinetic study of decarburization in molten steel-VII

Abstract

In order to study decarburization in an oxygen converter, a comparison was made between the reactions in a converter and in an open hearth furnace, and further the decarburizing reaction in our 160 tons oxygen converter was discussed by calculating the carbon loss in exhaust gas, as the converter was equipped with unburned gas recovery system.The results.obtained are summarized as follows:
(1) The C-0 relation in a converter is not in the“steady-state”which has been assumed for an open hearth furnace.
(2) It is probable that the decarburiz ng reaction mostly takes place at the oxygen gasmetal interface during oxygen blowing, including the bessemerizing period in an open hearth furnace.
(3) In a converter, almost 100% of oxygen blown into bath is used for decarburization when C content is over 1% except Si blowing period.
(4) The rate of decarburization or the oxygen efficiency for decarburization decreases with the decrease of C content from 1%, and considerable depression is observed below 0.3% C.
(5) This fact suggests that the amount of oxygen which affects other furnace reactions will rapidly increase in that stage, and it is found that its effect on the increase of total iron content in slag is most notable.