Birch, Stewart, Kolasch & Birch, LLP
Hot-rolled steel sheet and production method thereof
Disclosed is a hot-rolled steel sheet including, by mass %, C:0.02% to 0.5% of C, and the sum of the content of Si and the content of Al is 1.0% to 4.0%. 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 of an area ratio, 2% to 30% of retained austenite, 20% to 50% of ferrite, and 10% to 60% of bainite. rC that is a Lankford value in a direction orthogonal to a rolling direction is 0.70 to 1.10, and r30 that is a Lankford value in a direction forming an angle of 30° with the rolling direction is 0.70 to 1.10.
NIPPON STEEL & SUMITOMO METAL CORPORATION
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 C C B
C22C C21D C22C C22C C23C C22C C22C C22C C22C C22C C23C C22C C22C C22C C21D C22C C23C C21D C21D C21D C21D C22C C22C C22C C21D C21D C23C C22C C22C B32B
inventional additional inventional inventional inventional inventional inventional inventional inventional inventional inventional inventional inventional inventional additional inventional inventional inventional inventional inventional additional inventional inventional inventional inventional additional inventional inventional inventional inventional
Hiroshi Riki Chisato Nobuhiro Takeshi Shinichiro Takayuki Kohichi Manabu
Yoshida Okamoto Wakabayashi Fujita Yamamoto Watanabe Nozaki Sano Takahashi