Jfe Steel Corporation

Nkk Corporation

Suzuki Motor Corporation

Kobe Steel, Ltd.

Kansai Paint Company, Ltd.

Tokyo Institute of Technology

Kabushiki Kaisha Pilot Corporation

Jfe Galvanizing & Coating Co., Ltd.

Satoru Ando

Seiji Nakajima

Yoshiharu Sugimoto

Tatsuya Miyoshi

Masaki Tada

Takahiro Kubota

Masahiro Yoshida

Nobue Fujibayashi

Takayuki Urakawa

Hiroshi Matsuda

Kaoru Sato

Takeshi Matsuda

Takashi Nakano

Minoru Tanaka

Akira Matsuzaki

Toyofumi Watanabe

Sachiko Suzuki

Akihiko Furuta

Minako Morimoto

Yukimitsu Shiohara

Etsuo Hamada

Nobutoshi Konagai

Ruri Nakada

Yuya Ito

Rie Umebayashi

Kouta Sako

Yoshitsugu Suzuki

Yohei Sato

Katsutoshi Takashima

Susumu Satoh

Masaaki Yamashita

Yuji Yamasaki

Takashi Kawano

Rinsei Ikeda

Daisuke Mizuno

Masaki Abe

Masaru Sagiyama

Reiichi Suzuki

Hiroki Nakamaru

Masayasu Nagoshi

Yoichi Tobiyama

Junichi Inagaki

Susumu Sato

Hiroyuki Masuoka

Tatsuo Sato

Naoto Yoshimi

Masayasu Ueno

Yukio Kimura

Shunsuke Yamamoto

Masato Sasaki

Shoichiro Taira

Shinji Ootsuka

Masaya Morita

Kazuhisa Okai

Shigeru Takano

Hisato Noro

Tatsuyuki Nakatani

Jun Akui

Yasuhiko Haruta

Masao Takeyama

Minoru Miyata

Takumi Kajiwara

Keishi Okamoto

Takafumi Yamaji

Toshihiko Ooi

Hiroyasu Matsuki

Kazuki Nakazato

Kouichi Takayama

Rinta Sato

Toshiyuki Okuma

Sakae Fujita

Hirotaka Masuda

Yasuhiro Sodani

Yasuhiro Matsuki

Yuki Nitta

Syuji Nomura

Yoshikazu Morohoshi

Shogo Tomita

Kazuya Urata

Satoru Udagawa

Takashi Okubo

Shigeyuki Aizawa

Toshio Maruyama

Kunihiro Toyota

Tomoko Inagaki

Kenichi Tomita

Akimasa Kido

Tooru Tsuru

Hideo Koumura

Yoshito Furuya

Hideo Ogishi

A gas-shielded arc welding method includes welding a steel plate having a tensile strength of 780 MPa or more while feeding a consumable electrode via a welding torch and flowing a shielding gas. The consumable electrode includes, in mass %, C: 0 to 0.20%, Si: 0 to 0.50%, Mn: 0 to 0.50%, Cr: 1.00% to 9.00%, S: 0.0020% to 0.0600%, and Ni: 0 to 0.50%. The shielding gas includes, in vol. %, at least one of COand O: 1% to 15% in total, with the remainder being Ar and unavoidable impurities. Welding is performed under the condition satisfying the relationship of 1≤{−0.05×[CO+O]}+[Cr]≤8.3, and [Cr] represents the content of Cr in the consumable electrode, and [CO+O] represents a total content of at least one of COand Oin the shielding gas.

Gas-shielded arc welding method and method for manufacturing welded structure

To provide a hot-dip Al alloy coated steel sheet which is excellent in post-painting corrosion resistance and post-working corrosion resistance. Disclosed is a hot-dip Al alloy coated steel sheet comprising a coating formed by a coating layer and an interfacial alloy layer present at an interface between the coating layer and a base steel sheet, in which the interfacial alloy layer contains Mn, and the coating layer contains MgSi having a major axis length of 5 &#x3bc;m or more.

Hot-dip Al alloy coated steel sheet and method of producing same

Provided is a hot-dip Al&#x2014;Zn&#x2014;Mg&#x2014;Si coated steel sheet having good corrosion resistance in flat parts and edge parts, and also having excellent worked part corrosion resistance. The hot-dip Al&#x2014;Zn&#x2014;Mg&#x2014;Si coated steel sheet includes a base steel sheet and a hot-dip coating on a surface of the base steel sheet. The hot-dip coating includes an interfacial alloy layer present at an interface with the base steel sheet and a main layer present on the interfacial alloy layer, and contains from 25 mass % to 80 mass % of Al, from greater than 0.6 mass % to 15 mass % of Si, and from greater than 0.1 mass % to 25 mass % of Mg. The Mg content and Si content in the hot-dip coating satisfy formula (1):/(&#x2212;0.6)&#x3e;1.7&#x2003;&#x2003;(1)where Mrepresents the Mg content (mass %) and Mrepresents the Si content (mass %).

Hot-dip Al&#x2014;Zn&#x2014;Mg&#x2014;Si coated steel sheet and method of producing same

Provided is a hot-pressed member excellent in terms of paint adhesiveness and a method of manufacturing the hot-pressed member. A hot-pressed member has a coating layer containing Zn and Ni on the surface of a steel sheet of which the member is formed, an oxide film containing Zn on the coating layer, and a void formation rate is 80% or less for voids formed between the coating layer and the oxide film.

Hot-pressed member and method of manufacturing the same

A method of manufacturing a hot-pressed member including heating a coated steel sheet to 850&#xb0; C. to 950&#xb0; C., the coated steel sheet including a substrate steel sheet and a coating layer formed on the substrate steel sheet and containing 10% to 25% by mass of Ni and the balance being Zn and incidental impurities, in which the coating weight of the coating layer is 10 to 90 g/mper a side; and starting hot press forming when the temperature of the coated steel sheet which has been heated is 650&#xb0; C. to 800&#xb0; C.

Method of manufacturing hot-pressed member

The invention provides a steel sheet for hot press-forming that can reliably give hot press-formed parts having excellent paint adhesiveness, perforation corrosion resistance and joint corrosion resistance, and also provides a method for manufacturing the steel sheet for hot press-forming, and a method for producing hot press-formed parts using the steel sheet for hot press-forming. The steel sheet for hot press-forming includes a base steel sheet and a Zn-based coating layer with a mass of coating of 10 to 90 g/mon the base steel sheet, wherein the average ferrite grain diameter in the surface microstructure of the base steel sheet is not more than 20 &#x3bc;m.

Steel sheet for hot press-forming, method for manufacturing the same, and method for producing hot press-formed parts using the same

A steel sheet for hot press-forming having a first coating layer on a surface of the steel sheet, containing 60% or more by mass Ni and a remainder composed of Zn and incidental impurities, a coating mass thereof being more than 5 g/mand 50 g/mor less per side, and a second coating layer on the first coating layer, containing 10% to 25% by mass Ni and a remainder composed of Zn and incidental impurities, a coating mass thereof being 10 to 90 g/mper side.

Steel sheet for hot press-forming

A steel sheet for hot press-forming includes a zinc coating layer and a Si-containing compound layer in this order on a base steel sheet, wherein the Si-containing compound layer contains a silicone resin having an organic functional group of a carbon number of 4 or more.

Steel sheet for hot press-forming, hot press-formed part, and method of producing hot press-formed part

A mobile body corrosion measuring apparatus having a corrosion sensor installed in at least one portion of a mobile body, the corrosion sensor measuring a corrosion state at the portion and outputting corrosion data; a vehicle (mobile body) running speed sensor installed in the mobile body, the running speed sensor measuring a running speed of the mobile body and outputting the running speed data; and a data collection unit that acquires the corrosion data from the corrosion sensor and the running speed data from the vehicle speed sensor at the same time and collects the corrosion data and the running speed data with the corrosion data and the running speed data associated with each other. Due to above structure, a corrosion state specific to the mobile body can be accurately measured.

Method and apparatus for measuring corrosion of mobile body

Disclosed is a hot-dip Al&#x2014;Zn alloy coated steel sheet having excellent anti-corrosion property after coating, and a method for producing the same. In the disclosure, the hot-dip Al&#x2014;Zn alloy coated steel sheet has a hot-dip coating layer containing by mass %, Al: 25% to 90%, and at least one of Sn: 0.01% to 2.0%, In: 0.01% to 10%, and Bi: 0.01% to 2.0%.

Hot-dip Al&#x2014;Zn alloy coated steel sheet and method for producing same

An aluminum or aluminum alloy-coated steel material includes base steel; and a coating layer formed on a surface of the base steel and containing by mass % Mg: 6% to 10%, Si: 3% to 7%, Fe: 0.2% to 2%, Mn: 0.02% to 2%, and the balance as Al and incidental impurities, wherein the coating layer has pseudoternary eutectic microstructures of &#x3b1;Al&#x2014;MgSi&#x2014;(Al&#x2014;Fe&#x2014;Si&#x2014;Mn) and an area ratio of the pseudoternary eutectic microstructures in the coating layer is at least 30%.

Aluminum or aluminum alloy-coated steel material and method of manufacturing the same

There is provided a galvanized steel sheet that has various properties such as corrosion resistance and adhesion and allows for high conductivity at a low contact pressure. A first layer film is formed by applying a surface treatment solution having a pH of 8 to 10 onto the surface of the galvanized steel sheet and drying the surface treatment solution by heating, the surface treatment solution containing a water-soluble zirconium compound, a tetraalkoxysilane, an epoxy group-containing compound, a chelating agent, a silane coupling agent, vanadic acid, and a metal compound in a specific ratio. Subsequently, a second layer film is formed by applying a surface treatment solution containing an organic resin onto the surface of the first layer film and drying the surface treatment solution by heating.

Galvanized steel sheet

A hot-dip Zn&#x2014;Al alloy coated steel sheet exhibiting a beautiful coating appearance with metallic luster, in which no spangle or very fine spangles are formed, and having excellent blackening resistance and a method for manufacturing the hot-dip Zn&#x2014;Al alloy coated steel sheet are provided. The hot-dip Zn&#x2014;Al alloy coated steel sheet includes a hot-dip Zn&#x2014;Al alloy coating layer containing 1.0 to 10 percent by mass of Al, 0.2 to 1.0 percent by mass of Mg, 0.005 to 0.1 percent by mass of Ni, and the balance being Zn and incidental impurities on at least one surface of a steel sheet. The manufacturing method includes the steps of dipping the steel sheet into a hot-dip Zn&#x2014;Al alloy coating bath and pulling up and cooling the steel sheet, wherein the steel sheet pulled up from the coating bath is cooled to 250&#xb0; C. at a cooling rate of 1&#xb0; C. to 15&#xb0; C./sec.

Hot-dip Zn&#x2014;Al alloy coated steel sheet and producing method therefor

A surface-treatment agent contains a resin compound having a specific bisphenol skeleton, a cationic urethane resin emulsion, a silane coupling agent, an organic titanium chelate compound, a tetravalent vanadyl compound, and water, with predetermined proportions and having a pH of 4 to 5; a method for producing a coated steel sheet using the surface-treatment agent; and a coated steel sheet.

Surface-treatment agent, method for producing coated steel sheet using the surface-treatment agent, and coated steel sheet

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Tokyo, Japan

Satoru Ando