Production method for continuous casting cast billet
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United States of America Patent
Stats
-
May 6, 2003
Grant Date -
Oct 31, 2002
app pub date -
Nov 9, 2001
filing date -
Mar 9, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Molten steel is poured using an immersion nozzle and a direct current magnetic field zone is applied to a cast slab over the entire width in the thickness direction thereof at a predetermined distance below the molten metal level in a continuously-casting mold. The immersion nozzle is provided with ejection holes located in at least upper and lower stages, at least one lower ejection hole is disposed such that these satisfy the following formula (1). The supply rate of molten steel from the upper ejection holes is set smaller than the rate consumed by solidification in an upper pool, and a particular solute element is added to the molten steel in the upper pool. 0
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