1977 Volume 63 Issue 14 Pages 2326-2334
An oxygen sensor with Cr/Cr2O3 reference electrode has been developed and used practically in steelmaking operation. The relation between the dissolved oxygen content at blow off and the conditions of LD refining operation was studied with the help of the data obtained by this cell. Consequently. Al content of killed steels in the ladle, Si content of semi-killed steel, and Mn content of rimmed steel have been precisely adjusted from the dissolved oxygen content measured, because it gives the quantities of the materials to be added at the LD tapping process.
The main results obtained are summarized as follows:
(1) The oxygen sensor was successfully applied to practical use in steelmaking.
(2) Dissolved oxygen contents of the steel in the LD converter are closely related to Mn content and bath temperature as well as to C contents of steel.
(3) Dissolved oxygen contents are not affected by the “after blows” and the furnace life.
(4) Because the relation between the dissolved oxygen at blow off and Al content of killed steel in ladle has been clarified, more precise adjustment of Al content in ladle became possible, compared to the previous method using carbon-oxygen relations.
(5) Because oxygen content of steels are closely related to the Si content of Si-semi-killed steels and Mn content of rimmed steel, precise adjustments of the crow of Si-semi-killed ingot top and the degree of rimming action of steels became possible.