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US 6,284,016 B1Granted
Pressure converter steelmaking method
AssigneeNippon Steel Corporation
InventorsShinya Kitamura, Michitaka Matsuo, Kenichiro Naito
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AssigneeNippon Steel Corporation
InventorsShinya Kitamura, Michitaka Matsuo, Kenichiro Naito
Estimating the term…
The invention intends to provide a converter refining method capable of blowing molten steel having a low degree of superoxidation with high productivity and high yield. A first aspect resides in a pressurized converter steelmaking method for use in a top-and-bottom blowing converter, wherein a converter internal pressure P is set to a higher level than the atmospheric pressure, and a top-blown oxygen flow rate F and a bottom-blown gas flow rate Q are adjusted depending on changes of the converter internal pressure P. A second aspect resides in a pressurized converter steelmaking method for use in a top-and-bottom blowing converter, wherein a converter internal pressure P is set to a higher level than the atmospheric pressure during the whole or a part of a blowing period, and a top-blown oxygen flow rate F, a bottom-blown gas flow rate Q and the converter internal pressure P are changed depending on a steel bath carbon concentration C.
A pressurized converter steelmaking method for use in a top-and-bottom blowing converter, which comprises setting a converter internal pressure P in kg/cm2 to a higher level than the atmospheric pressure, and adjusting a top-blown oxygen flow rate F in Nm3/ton/min and a bottom-blown gas flow rate Q in Nm3/ton/min depending on changes of the converter internal pressure P to maintain the converter internal pressure at a higher level than the atmospheric pressure.
A pressurized converter steelmaking method for use in a top-and-bottom blowing converter, which comprises setting, in a region in which a steel bath carbon concentration is higher than 0.5 wt %, a converter internal pressure P1 in kg/cm2 to a higher level than the atmospheric pressure, and controlling a top-blown oxygen flow rate F1 in Nm3/ton/min and a bottom-blown gas flow rate Q1 in Nm3/ton/min to hold F1/P1 in the range of 1.1-4.8 and Q1/P1 in the range of 0.05-0.35.
A pressurized converter steelmaking method for use in a top-and-bottom blowing converter, which comprises setting a converter internal pressure P in kg/cm2 to a higher level than the atmospheric pressure during the whole or a part of a blowing period, and changing a top-blown oxygen flow rate F in Nm3/ton/min, a bottom-blown gas flow rate Q in Nm3/ton/min and the converter internal pressure P depending on a steel bath carbon concentration C in wt %.
Dependencies are inferred from the claim text.