Method for stably refining high carbon steel
AssigneeKabushiki Kaisha Kobe Seiko Sho
InventorsMinoru Kitamura, Shinji Koyama, Shuzo Ito, Masahiko Ohgami, Hideaki Fujimoto
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Abstract
A method for stably refining high carbon steel by top and bottom blown converter refining in which the entire quantity or part of refining pure oxygen is blown onto molten iron through a top blowing lance nozzle while blowing an inert gas into the converter through a nozzle at the bottom thereof, and wherein the bottom blown inert gas is fed at a rate less than 0.09 Nm.sup.3 /min.multidot.ton during the blowing and/or at a rate less than 0.03 Nm.sup.3 /min.multidot.ton in a controlling stage immediately after turndown.
Claims5
A method for stably refining high carbon steel by top and bottom blown converter refining utilizing a converter, a top blowing lance nozzle and a nozzle at the bottom of the converter, which comprises:
- blowing refining pure oxygen onto molten iron through said top blowing lance nozzle;
- simultaneously blowing an inert gas into the converter through said nozzle at the bottom thereof wherein said blowing of inert gas further comprises feeding the bottom blown inert gas at a rate less than 0.09 Nm.sup.3 /min.multidot.ton during blowing of said inert gas;
- and
- subsequently feeding the bottom blown inert gas at a rate less than 0.03 Nm.sup.3 /min.multidot.ton during a controlling stage subsequent to the blowing of said inert gas.
Dependencies are inferred from the claim text.