Method and apparatus for vacuum decarburization refining of molten steel

In a straight barrel type vacuum refining apparatus, use is made of a combination of: a decarburization method wherein the flow rate of oxygen fed into a vacuum tank and the flow rate of an inert gas fed into the vacuum tank are regulated and, at the same time, the flow rate of oxygen gas blown is r...

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Main Authors ISHIMATSU HIROYUKI, HAYAKAWA RYUZOU, KATO KATSUHIKO, KATAHIRA KEIICHI, MIYAMOTO KENICHIRO, KANEYASU TAKAYUKI, SHINKAI AKIO, SUGANO HIROSHI, KITAMURA SHINYA
Format Patent
LanguageEnglish
Published 22.10.2002
Edition7
Subjects
CHEMISTRY
METALLURGY
METALLURGY OF IRON
PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OFWROUGHT-IRON OR STEEL
TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
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Summary:In a straight barrel type vacuum refining apparatus, use is made of a combination of: a decarburization method wherein the flow rate of oxygen fed into a vacuum tank and the flow rate of an inert gas fed into the vacuum tank are regulated and, at the same time, the flow rate of oxygen gas blown is reduced at a rate of 0.5 to 12.5 Nm3/h/t/min in a low carbon concentration region having a carbon concentration of not more than the critical carbon concentration; and a vacuum refining apparatus provided with dust accumulation preventing means.
Bibliography:Application Number: US20000712303