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Application

95114760/02, 1995-08-15

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Actual filing date

1995-08-15

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Published

1997-11-27

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Inventor

Stomakhin A.Ja.Vasil'Ev G.I.Korolev M.G.Savchenko V.I.Jaroshenko A.V.Lebedev V.I.Djubanov G.V.Chumarin B.A.Rjabov V.V.

(73)

Holder

Aktsionernoe Obshchestvo Metallurgicheskij Kombinat"

METHOD OF CONVERTER STEEL MELTING Russian patent published in 1997 - IPC

Abstract RU 2097434 C1

FIELD: metallurgy, namely steel melting in converter with combination blowing. SUBSTANCE: method providing carbon content of steel less than 0.015% comprises steps of blowing melt by oxygen from upstairs through tuyere and by neutral gas through bottom tuyeres for the whole melting process, changing flowrate of neutral gas, determining chemical content of melt, measuring its temperature, discharging melt to ladle and feeding killing agents to it. When carbon content C1 of melt achieves 0.02-0.06% at 1680-1720 C oxygen blowing is interrupted and neutral gas is blown with specific flowrate determined according to relation Q=Kx(C1-C2), where Q - specific flowrate of neutral gas from time moment of achieving carbon content of melt equal to 0.02-0.06%, cubic meter/ton of melt; C1 - carbon content of melt before feed of neutral gas with flowrate Q,%; C2 - necessary carbon content of melt after termination of neutral gas feed with flowrate Q,%; K=(60-130)- empirical coefficient taking into account law of removing carbon oxide out of melt by means of neutral gas bubbles and set according to value of the above mentioned difference (C1-C2), cubic meter/%. ton of melt. If melt temperature is less than 1680 C at carbon content C1 equal to 0.02-0.06% said melt is additionally heated up to 1680-1720 C for time period determined according to discharge of neutral gas from time moment of measuring temperature in quantity (0.05-0.4)Q. EFFECT: lowered carbon content of steel. 2 cl, 2 dwg

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RU 2 097 434 C1

Authors

Stomakhin A.Ja.

Vasil'Ev G.I.

Korolev M.G.

Savchenko V.I.

Jaroshenko A.V.

Lebedev V.I.

Djubanov G.V.

Chumarin B.A.

Rjabov V.V.

Dates

1997-11-27—Published

1995-08-15—Filed

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