SMELTING METHOD FOR HIGH-CLEANLINESS DEAD SOFT STEEL

PURPOSE:To efficiently obtain the dead soft steel with high cleanliness by limiting the quantity of the oxygen to be supplied into a vacuum degassing chamber and compensating the temp. insufficiency at the end of a decarburization stage by the addition of Al and the top blowing of the oxygen. CONSTI...

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Bibliographic Details
Main Authors SUETSUGU SEIICHI, NAKATO SAN
Format Patent
LanguageEnglish
Published 23.08.1991
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:PURPOSE:To efficiently obtain the dead soft steel with high cleanliness by limiting the quantity of the oxygen to be supplied into a vacuum degassing chamber and compensating the temp. insufficiency at the end of a decarburization stage by the addition of Al and the top blowing of the oxygen. CONSTITUTION:The decarburization is executed by limiting the quantity of the oxygen to be supplied via a lance 16 into the vacuum degassing chamber to <=0.3Nm /t and confining the increase rate of the concn. of T.Fe in slag to about <=1%. The Al is added via an adding chute 20 during killed treatment when the temp. is insufficient. The oxygen lacking for the combustion of the Al is top blown via a lance 16. The high-cleanliness dead soft steel of <=2% T.Fe in the slag, <=30ppm O in the steel and <=20ppm C is produced in this way.
Bibliography:Application Number: JP19890334253