Showing papers by "Nobuhiro Fujita published in 2016"
Patent•
20 Apr 2016TL;DR: This high-strength cold-rolled steel sheet contains, in mass %, C: 002% to 020%; Si: 0001% to 25%; Mn: 001% to 40%; P: 00 01% to 015%; S: 00005% to 003%; Al: 00 1% to 20%; N: 0000 5% to 1%; O: 0000 1% or less; and O: 00 5% or more as discussed by the authors.
Abstract: This high-strength cold-rolled steel sheet contains, in mass %, C: 002% to 020%; Si: 0001% to 25%; Mn: 001% to 40%; P: 0001% to 015%; S: 00005% to 003%; Al: 0001% to 20%; N: 00005% to 001%; and O: 00005% to 001%; in which Si+Al is limited to less than 10%, and a balance being composed of iron and inevitable impurities, in which an area ratio of bainite in a metal structure is 95% or more, at a sheet thickness center portion being 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} to {223} orientation group is 40 or less, and a pole density of the {332} crystal orientation is 50 or less, and a mean volume diameter of crystal grains in the metal structure is 7 μm or less