Method for continuously casting between two rolls austenitic stainless steel strips with excellent surface quality and resulting strips
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United States of America Patent
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May 25, 2004
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N/A
app pub date -
Jan 14, 2002
filing date -
Apr 22, 1999
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Abstract
The invention concerns a method for continuously casting an austenitic stainless steel strip with a thickness not more than 10 mm, directly from liquid metal, between two cooled horizontal rolls, characterised in that: said steel composition in weight proportions comprises: %C.ltoreq.0.08%; %Si.ltoreq.1; %P.ltoreq.0.04; %Mn.ltoreq.2; %Cr between 17 and 20; %Ni between 8 and 10.5; %S between 0.007 and 0.040; the rest being iron and the impurities resulting from preparation; the ratio Cr.sub.eq /Ni.sub.eq ranges between 1.55 and 1.90 with: Cr.sub.eq (%)=%Cr+1.37 %Mo+1.5 %Si+2%Nb+3 %Ti; Ni.sub.eq (%)=%Ni+0.31 %Mn+22 %C+14.2 %N+Cu; the surface of the rolls comprises contiguous dimples with more or less circular or elliptical cross-section, of diameter between 100 and 1500 .mu.m and depth between 20 and 150 .mu.m; the inerting gas surrounding the meniscus is a gas soluble in steel or a mixture of such gases, or consists of at least 50% by volume of such a gas or mixture of gases.
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