Method for producing a high strength steel sheet having improved strength and formability and obtained sheet
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United States of America Patent
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Jan 17, 2023
Grant Date -
May 18, 2017
app pub date -
Jul 3, 2015
filing date -
Jul 3, 2014
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Abstract
A method for producing a high strength uncoated steel sheet having an improved strength and an improved formability, including the steps of: providing an uncoated steel sheet; annealing the sheet at an annealing temperature TA higher than 865° C. but less than 1000° C. for a time of more than 30 s; cooling the sheet down to a quenching temperature QT between 310° C. and 375° C., at a cooling speed of at least 30° C./s; heating the sheet up to a partitioning temperature PT between 370° C. and 470° C. and maintaining the sheet at the partitioning temperature for a partitioning time Pt between 50 s and 150 s; and cooling the sheet down to the room temperature.
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