High strength steel sheet having excellent hydrogen embrittlement resistance
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United States of America Patent
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Oct 11, 2016
Grant Date -
May 31, 2012
app pub date -
May 28, 2010
filing date -
May 29, 2009
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Abstract
Disclosed is a high strength steel sheet having excellent hydrogen embrittlement resistance. The steel sheet has a tensile strength of 1180 MPa or more, and satisfies the following conditions: with respect to an entire metallographic structure thereof, bainite, bainitic ferrite and tempered martensite account for 85 area % or more in total; retained austenite accounts for 1 area % or more; and fresh martensite accounts for 5 area % or less (including 0 area %).
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