Birch, Stewart, Kolasch & Birch, LLP
Cold-rolled steel sheet and production method thereof
This is a cold-rolled steel sheet includes, by mass %, C: 0.02% to 0.4%, Si: 0.001% to 2.5%, Mn: 0.001% to 4.0%, and Al: 0.001% to 2.0%. The sum of the Si content and the Al content is 1.0% to 4.5%. An average pole density of an orientation group from {100}<011> to {223}<110> is 1.0 to 6.5, and a pole density of a crystal orientation {332}<113> is 1.0 to 5.0. A microstructure includes, by an area ratio %, 5% to 80% of ferrite, 5% to 80% of bainite, and 2% to 30% of retained austenite. In the microstructure, by an area ratio %, martensite is limited to 20% or less, pearlite is limited to 10% or less, and tempered martensite is limited to 60% or less.
NIPPON STEEL & SUMITOMO METAL CORPORATION
C C B C C C C C C C C C C C C C C C C C C C C C C C C C C C
C22C C21D B32B C21D C22C C21D C21D C22C C22C C22C C22C C21D C23C C22C C22C C23C C22C C22C C22C C23C C22C C22C C21D C22C C22C C21D C22C C21D C22C C23C
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Shinichiro Manabu Hiroshi Nobuhiro Takayuki Takeshi
Watanabe Takahashi Yoshida Fujita Nozaki Yamamoto