Process for the continuous casting of an austenitic stainless steel strip onto one or between two moving walls with dimpled surfaces, and casting plant for its implementation
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United States of America Patent
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Sep 15, 1998
Grant Date -
N/A
app pub date -
Mar 17, 1997
filing date -
Mar 22, 1996
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Abstract
The subject of the invention is a process for the continuous casting of an austenitic stainless steel strip directly from liquid metal of composition, expressed in percentages by weight: C.ltoreq.0.08%, Si.ltoreq.1%; Mn.ltoreq.2%; P.ltoreq.0.045%; S.ltoreq.0.030%; Cr between 17.0 and 20.0%; Ni between 8.0 and 10.5% on a machine for casting onto one or between two moving walls whose external surface is provided with dimples and in which the region surrounding the meniscus is inerted with an inerting gas of controlled composition, wherein: a Cr.sub.equ /Ni.sub.equ ratio greater than 1.55 is conferred on said liquid metal, with: Cr.sub.equ =% Cr+1.37.times.% Mo+1.5.times.% Si+2.times.% Nb+3.times.% Ti and Ni.sub.equ =% Ni+0.31.times.% Mn+22.times.% C+14.2.times.% N+% Cu; one or more moving walls are used whose entire surface includes touching dimples having a diameter of between 100 and 1500 .mu.m and a depth of between 20 and 150 .mu.m; and an inerting gas is used consisting, at least partially, of a gas which is soluble in steel. The subject of the invention is also a casting plant for implementing this process.
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