High strength steel sheet having excellent formability and method for production thereof
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United States of America Patent
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Aug 15, 2006
Grant Date -
Apr 22, 2004
app pub date -
Jan 31, 2002
filing date -
Jan 31, 2001
priority date (Note) -
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Abstract
A high strength steel sheet having (2-1) a base phase structure, the base phase structure being tempered martensite or tempered bainite and accounting for 50% or more in terms of a space factor relative to the whole structure, or the base phase structure comprising tempered martensite or tempered bainite which accounts for 15% or more in terms of a space factor relative to the whole structure and further comprising ferrite, the tempered martensite or the tempered bainite having a hardness which satisfies the relation of Vickers hardness (Hv).gtoreq.500[C]+30[Si]+3[Mn]+50 where [ ] represents the content (mass %) of each element, and (2-2) a second phase structure comprising retained austenite which accounts for 3 to 30% in terms of a space factor relative to the whole structure and optionally further comprising bainite and/or martensite, the retained austenite having a C concentration (C.gamma.R) of 0.8% or more.
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