Patent
High strength thin steel sheet having high hydrogen embrittlement resisting property
Fumio Yuse,Shushi Ikeda,Yoichi Mukai,Hiroshi Akamizu,Junichiro Kinugasa,Kenji Saito,Koichi Sugimoto,Tomohiko Hojo +7 more
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TLDR
In this paper, a high strength thin steel sheet with high hydrogen embrittlement resisting property is presented, which has a tensile strength of 1180 MPa or higher, and the metal structure comprises residual austenite; 1% by area or more in proportion to the entire structure; bainitic ferrite and martensite: 80% or more.Abstract:
The purpose of the present invention is to provide a high strength thin steel sheet that has high hydrogen embrittlement resisting property. In order to achieve the above purpose, a high strength thin steel sheet having high hydrogen embrittlement resisting property comprises: C: 0.10 to 0.25%; Si: 1.0 to 3.0%; Mn: 1.0 to 3.5%; P: 0.15% or less; S: 0.02% or less; and Al: 1.5% or less (higher than 0%) in terms of percentage by weight, with balance of iron and inevitable impurities; and the metal structure comprises: residual austenite; 1% by area or more in proportion to the entire structure; bainitic ferrite and martensite: 80% or more in total; and ferrite and pearlite: 9% or less (may be 0%) in total, while the mean axis ratio (major axis/minor axis) of said residual austenite grains is 5 or higher, and the steel has tensile strength of 1180 MPa or higher.read more
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High strength steel sheet and method for manufacturing the same
TL;DR: In this paper, a high-strength steel sheet with a tensile strength of 980 MPa or more has been described, which includes 50% or more of martensite, 50% of ferrite, 10% or less (including 0%) of bainite, and residual austenite.
Patent
High-strength steel sheet having excellent hydrogen embrittlement resistance
Yoichi Mukai,Kouji Kasuya,Michiharu Nakaya,Michitaka Tsunezawa,Fumio Yuse,Junichiro Kinugasa,Sandra Dr Traint,Andreas Pichler +7 more
TL;DR: In this paper, a high strength steel sheet having excellent hydrogen embrittlement resistance is described. The steel sheet has a tensile strength of 1180 MPa or more, and satisfies the following conditions: with respect to an entire metallographic structure thereof, Bainite, bainitic ferrite and tempered martensite account for 85 area % or more in total.
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High strength cold rolled steel sheet and plated steel sheet excellent in the balance of strength and workability
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Ultrahigh-strength thin steel sheet
Junichiro Kinugasa,Fumio Yuse,Yoichi Mukai,Shinji Kozuma,Hiroshi Akamizu,Kouji Kasuya,Muneaki Ikeda,Koichi Sugimoto +7 more
TL;DR: In this paper, an ultra-strength thin steel sheet excellent in the hydrogen embrittlement resistance, the steel sheet including, by weight %, 0.10 to 0.60% of C, 1.0 to 3.5% of Mn and a balance including iron and inevitable impurities.
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Patent
Ultra-high strength steel sheet having excellent hydrogen embrittlement resistance, and method for manufacturing the same
TL;DR: In this paper, the authors proposed an ultra-high strength steel sheet having excellent hydrogen embrittlement resistance, which includes: 0.06 to 0.6% of C, 0.5 to 3% of Si+Al; 0.15% or lower of P, and also includes 3% or higher of residual austenite structure.
Patent
High-strength cold rolled steel sheet having excellent formability, and plated steel sheet
Shushi Ikeda,Yoichi Mukai,Hiroshi Akamizu,Koichi Makii,Koichi Sugimoto,Hashimoto Shunichi,Kenji Saito +6 more
TL;DR: In this paper, a high-strength cold-rolled steel sheet with well-balanced tensile strength and elongation as well as well balanced tensile strengths and stretch-flangeability, and a plated steel sheet manufactured by plating the steel sheet is presented.
Patent
High-strength thin steel sheet superior in delayed fracture resistance after being formed, manufacturing method therefor, and high strength component for automobile made of the high-strength thin steel sheet
TL;DR: In this paper, the authors proposed a high-strength thin steel sheet which prevents hydrogen attributed defects from occurring after being formed, and is superior in delayed fracture resistance, and to provide a manufacturing method therefor.
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Thick steel plate minimal in hydrogen induced defect, and its production
TL;DR: In this paper, the authors proposed a solution to prevent hydrogen induced defects liable to occur in an extra-thick steel plate after rolling or after accelerated cooling and hardening treatment with respect to the extra thick steel plate.
Patent
Non-heat-treated hot-forging steel excellent in tensile strength, fatigue strength and machinability
TL;DR: In this paper, a non-heat-treated ferritic-bainitic steel was used as hot-forged, wherein the following relation holds between the bainitic structure fraction f and the carbon content C(%): 1.4C + 0.4