Abstract This invention relates to a method and apparatus for making steel in a converter top-blown with oxygen. In particular, the invention relates to operating a converter top-blown with oxygen by monitoring the temperature on the area of the bath surface contacted by the oxygen jet, which is the reaction zone, determining the reaction-zone temperature decrease indicating the end of desiliconization of the bath, and thereupon increasing the amount of oxygen and preferably also decreasing the height of the oxygen lance above the bath surface during the carbon-removal portion of oxygen blowing. The increased oxygen flow rate and decreased lance height is maintained for the remainder of the Steelmaking operation.
Inventors
👤 Joseph A Murphy
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-03 15:30
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/28; C21C5/30
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
140 words
A combination as defined in claim 1, characterized in that said control means for increasing the rate of flow of oxygen-containing gas in said jet comprises a first device upon which a setting corresponding to an initial oxygen flow rate is made, a second device upon which a setting corresponding to the final oxygen flow rate is made, a third device upon which a setting is made corresponding to the rate of increase of oxygen flow rate to be observed between the end of the time of using the initial oxygen flow rate and the start of the time of using the final oxygen flow rate, and means responsive to said first, second, and third devices and to said means for following the temperature in said reaction zOne for varying the rate of flow of oxygen-containing gas in said jet.
Claim 2
Dependent Claim
57 words
A combination as defined in claim 2 further characterized in that means are provided for determining reaction-zone temperature-rate changes outside selected temperature-rate change limits and for affecting said control means for increasing the rate of flow of oxygen-containing gas to correct said rate of flow to bring said reaction-zone temperature change within said selected temperature-rate change limits.
Claim 3
Dependent Claim
20 words
A combination as defined in claim 3, characterized in that means are provided for lowering said lance toward said iron.