HIGH-STRENGTH STEEL SHEET HAVING EXCELLENT FORMABILITY AND LOW-TEMPERATURE TOUGHNESS, AND METHOD FOR PRODUCING SAME
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United States of America Patent
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Aug 18, 2016
app pub date -
Sep 25, 2014
filing date -
Sep 25, 2014
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Abstract
A high-strength steel sheet of the present invention is a steel sheet satisfying a predetermined component composition. A metal structure of the steel sheet is composed of polygonal ferrite, high-temperature region generated bainite, low-temperature region generated bainite and retained austenite each having a predetermined area percent, and a distribution using each average IQ of predetermined crystal grains determined by electron backscatter diffraction satisfies Equations (1) and (2) below. According to the present invention, a high-strength steel sheet having excellent formability and low-temperature toughness can be realized even at a tensile strength of 590 MPa or more.
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