Reduction of butt curl by pulsed water flow in DC casting
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United States of America Patent
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Feb 5, 2013
Grant Date -
Sep 27, 2012
app pub date -
Mar 15, 2012
filing date -
Mar 23, 2011
priority date (Note) -
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Abstract
The invention provides a method of reducing butt curl during DC casting of a metal ingot. The ingot is cast in at least two stages, including an initial casting stage and then a steady-state casting stage carried out at higher casting speed. The emerging ingot is cooled by directing a liquid coolant onto its outer surface. During the first casting stage, the liquid coolant is directed in the form of at least two streams, including a constant first stream in the form of a series of first jets, and an intermittent second stream in the form of a series of second jets. The first and second jets impact the outer surface at locations spaced from each other peripherally and/or longitudinally of the ingot. Both the first and second streams experience film boiling when they contact the ingot. The invention includes apparatus for the method.
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