Birch, Stewart, Kolasch & Birch, LLP
High-strength cold-rolled steel sheet having excellent stretch flangeability and precision punchability and manufacturing method thereof
A high-strength cold-rolled steel sheet having excellent stretch flangeability and precision punchability containing predetermined components and a balance being composed of iron and inevitable impurities, in which in a range of ⅝ to ⅜ in sheet thickness from the surface of the steel sheet, an average value of pole densities of the {100}<011> to {223}<110> orientation group represented by respective crystal orientations of {100}<011>, {116}<110>, {114}<110>, {113}<110>, {112}<110>, {335}<110>, and {223}<110> is 6.5 or less, and a pole density of the {332}<113> crystal orientation is 5.0 or less, and a metal structure contains, in terms of an area ratio, greater than 5% of pearlite, the sum of bainite and martensite limited to less than 5%, and a balance composed of ferrite.
NIPPON STEEL AND SUMITOMO METAL CORPORATION
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Nobuhiro Hiroshi Shinichiro Riki Tatsuo Kazuaki
Fujita Shuto Watanabe Okamoto Yokoi Nakano