High strength steel sheet and high strength galvanized steel sheet excellent in shapeability and methods of production of same
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United States of America Patent
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Feb 20, 2018
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app pub date -
Jul 27, 2012
filing date -
Jul 29, 2011
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Abstract
High strength steel sheet and high strength galvanized steel sheet which are excellent in shapeability which secure a tensile maximum strength 900 MPa or more high strength while obtaining excellent ductility and stretch flangeability, which sheets have predetermined compositions of ingredients, have steel sheet structures which contain volume fraction 1 to 20% of residual austenite phases, and which have martensite transformation points of the residual austenite phases of −60° C. or less.
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