The Rate of Decarbonization in Basic Open Hearth.

Kinetics of decarbonization in molten steel-II

Abstract

The rate of decarbonization in a 100-t basic open hearth furnace was measured, and the relations between the rate of decarbonization and C, O contents in molten steel were examined. The following results were obtained.
(1) The relation between the rate of decarbonization and C×ΔO was not obtained.
(2) The relations between the rate of decarbonization and C were as follows.
(a) C>0.30%: In one charge, there existed one or two large regions of carbon content by which the rate of decarbonization was not changed in molten steel. And this constant rate of decarbonization was changed by each region and each melt.
(b) C<0.30%: The rate of decarbonization decreased in proportion to carbon contents in molten steel.
(3) The relation between the rate of decarbonization and ΔO was not obtained. The reasons were as follows.
(a) The value of oxygen content was obtained from samples which were taken from relatively bottom parts of molten steel.
(b) C>0.30%: The oxygen content of molten steel was not changed so much. C<0.30%: Though O, O' equ., ΔO' and ΔO increased with carbon elimination, the rate of decarbonization decreased rapidly.
(4) The rate of decarbonization in oxygen lance method was large compared with ore method.