AUSTENITIC STAINLESS STEEL SHEET AND A METHOD FOR ITS MANUFACTURE
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United States of America Patent
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May 10, 2012
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Nov 18, 2009
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Abstract
An austenitic stainless steel sheet for springs having both a high strength and excellent formability has a chemical composition comprising C: 0.01-0.15%, Si: at most 3.0%, Mn: at most 3.0%, Cr: 10.0-30.0%, Ni: 4.0-20.0%, N: at most 0.40%, and a remainder of Fe and impurities, and it has a metallurgical structure such that the austenite content γs (%) in the surface region of the steel sheet and the austenite content γc (%) in the center region of the sheet thickness satisfy (γs+γc)/2≦55 and γs/γc≧0.10, with the remaining structure being primarily strain-induced martensite.
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