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Nobuhiro Fujita
Researcher at Nippon Steel
Publications - 252
Citations - 3215
Nobuhiro Fujita is an academic researcher from Nippon Steel. The author has contributed to research in topics: Ferrite (iron) & Austenite. The author has an hindex of 29, co-authored 252 publications receiving 3174 citations.
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Patent
High-strength cold-rolled steel sheet, high-strength galvanized steel sheet, and high-strength alloying hot-dip galvanized steel sheet, excellent in bendability, and method for manufacturing the same
Masashi Azuma,昌史 東,Takayuki Nozaki,貴行 野崎,Chie Wakabayashi,千智 若林,Nobuhiro Fujita,展弘 藤田,Koichi Sato,浩一 佐藤,Kawada Hiroyuki,川田 裕之 +11 more
TL;DR: In this paper, a steel sheet is composed of steel containing 0.075-0.300% C, 0.30-3.50% Si, 1.1-1.5% Al, 0.,0001-0.,0100% N, 0,0001- 0.00% O, and a ratio of the hardness Hvs on the steel sheet surface layer to the hardness hvb at 1/4 thickness of the steel sheets being 0.35-0.90.
Patent
High-strength and low-specific-gravity steel sheet having excellent ductility, and its manufacturing method
TL;DR: In this paper, a high-strength and low-specific-gravity steel sheet has a composition consisting of, by mass, > 0.01 to 5.0% C, ≤ 3.0%, 0.02% P, ≤ 0.05% N and the balance Fe with inevitable impurities and has ≤6.5 specific gravity.
Patent
Hot-dip galvanized steel sheet having tensile strength of 980 mpa or more and excellent in formability and production method of the same
Chie Wakabayashi,千智 若林,Masashi Azuma,昌史 東,Tsutomu Okamoto,力 岡本,Nobuhiro Fujita,展弘 藤田,Manabu Takahashi,学 高橋 +9 more
TL;DR: In this paper, a hot-dip galvanized steel sheet (including a galvannealed steel sheet) excellent in formability and a production method of the same is presented. But the method is not suitable for high temperature steel slabs.
Patent
Steel sheet for hot press having excellent delayed fracture resistance and collision safety, and method for producing the same
Nobuhiro Fujita,Kaoru Kawasaki,Tsutomu Okamoto,Koichi Sano,Yoshito Sekido,幸一 佐野,力 岡本,薫 川崎,展弘 藤田,義仁 関戸 +9 more
TL;DR: In this paper, a steel sheet for hot press has a composition which comprises 01 to 05% C, 005 to 2% Si, 01 to 3% Mn and 0003 to 2%, and satisfies formula (1) Si+Al≥10% and formula (2): 50≥Vc≥25; wherein Vc=10^(369-075β) [°C/s]; and β=27C+04Si+Mn
Patent
Hot dip galvanized steel sheet and alloyed hot dip galvanized steel sheet having excellent corrosion resistance, elongation and hole expandability, and method for producing them
Nobuhiro Fujita,Koichi Goto,Naoki Matsutani,Toshiaki Mizoguchi,Tsutomu Okamoto,Yuichi Taniguchi,Yoshiyuki Uejima,良之 上島,力 岡本,貢一 後藤,直樹 松谷,利明 溝口,展弘 藤田,裕一 谷口 +13 more
TL;DR: In this article, a hot dip galvanized high strength steel sheet is characterized by applying hot-tip galvanizing to a steel steel having a steel composition containing, by mass, 0.01 to 0.20% C, ≤2.0% Si, ≤ 2.5 to 3.5% N, and the balance iron with inevitable impurities, and having a ferrite-martensite structure consisting mainly of ferrite, and in which Mn microsegregation in the range of 1/8to 3/8t of the sheet thickness t lies in the