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2 154 679

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IPC

(21) (22)

Application

99101303/02, 1999-01-19

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Start date

1999-01-19

(22)

Actual filing date

1999-01-19

(45)

Published

2000-08-20

(72)

Inventor

Nastich V.P.Kazadzhan L.B.Savchenko V.I.Ponomarev B.I.Taran V.G.Shchelkanov V.S.Lebedev V.I.

(73)

Holder

Aktsionernoe Obshchestvo Metallurgicheskij Kombinat"

METHOD OF MELTING ELECTRICAL-SHEET STEEL Russian patent published in 2000 - IPC

Abstract RU 2154679 C1

FIELD: metallurgy; melting electrical-sheet steel of silicon grades followed by their desulfurizing, deoxidation and alloying. SUBSTANCE: method of melting electrical-sheet steel in converter includes charging metal scrap into converter, pouring molten iron, supply of slag-forming materials to converter, purging melt with oxygen, determination of chemical composition of melt, tapping melt into ladle, supply of slag-forming materials and alloying composition to ladle including lime and fluorspar. Part of slag from previous melting cycle is left in ladle; consumption of slag is found from the following dependence: Q = K•q•[0,28•S_n/S_m+0,6/τ+(1-C_n•25)], where q is consumption of mixture of lime and fluorspar, kg/t of melt; S_n is content of sulfur in melt at turning-down the converter, mass-%; S_m is preset content of S in finished steel, mass-%; C_n is content of C in melt at turning-down the converter, mass-%; τ - is time of tapping the melt from converter, min; K - 0.75 to 0.95 is coefficient. Mixture of lime and fluorspar is fed to ladle at ratio of (2-3):1. EFFECT: enhanced efficiency; increased productivity. 1 tbl

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RU 2 154 679 C1

Authors

Nastich V.P.

Kazadzhan L.B.

Savchenko V.I.

Ponomarev B.I.

Taran V.G.

Shchelkanov V.S.

Lebedev V.I.

Dates

2000-08-20—Published

1999-01-19—Filed