Nippon Steel Corporation

Nippon Paint Industrial Coatings Co., Ltd.

Mitsui Takeda Chemicals, Inc.

Yoichiro Mori

Masafumi Azuma

Kenichiro Otsuka

Shinji Kodama

Nobuo Kadowaki

Yasuaki Kawamura

Tomohiro Mizutani

Akihiko Hirata

Masahiro Matsuba

Tsutomu Tawa

Tadaaki Ochiai

Chikako Kouda

Masahiro Fuda

Hiroshi Kanai

Satoshi Kato

Akihiro Sengoku

Yusuke Wada

Koji Akioka

Ikuro Yamaoka

Ryousuke Wake

Kazushi Iwakiri

Makoto Yamasaki

Kensei Yuasa

Mitsutaka Nambo

Akhiro Miyasaka

Mitsuhiro Nishimura

Fumiaki Hirata

An automobile undercarriage part of the present invention has a welded joint formed by base steel plate,

Automobile undercarriage part

An automobile undercarriage part of the present invention is an automobile undercarriage part including a welded joint in which a first steel sheet and a second steel sheet are overlapped and a fillet weld is formed between an end surface of the first steel sheet and a surface of the second steel sheet, in which a chemical composition of a weld metal that forms the welded joint contains, with respect to a total mass of the weld metal, by mass %, C: 0.02% to 0.20%, Si: more than 0% to less than 0.10%, Mn: 0.3% to 2.0%, Al: 0.002% to 0.30%. Ti: 0.005% to 0.30%, P: more than 0% to 0.015%, and S: more than 0% to 0.030%, and the following formula (1) and formula (2) are satisfied.[Al]+[Ti]>0.05  Formula (1)7×[Mn]−112×[Ti]−30×[Al]≤4.0  Formula (2)

A coated steel sheet has a coating film on at least one side of a plated steel sheet. The coating film contains a binder resin, non-oxide ceramic particles containing V (excluding VC particles), and doped zinc oxide particles. The respective contents of the non-oxide ceramic particles containing V and the doped zinc oxide particles relative to the coating film satisfy the expressions: [(1) C&#x2265;10.0, (2) C&#x2264;0.5&#xb7;C, (3) C&#x2264;70&#x2212;C, (4) C&#x2265;0.125&#xb7;C, and (5) C&#x2265;2.0], where Crepresents the content (mass %) of the non-oxide ceramic particles containing V, and Crepresents the content (mass %) of the doped zinc oxide particles. The coated steel sheet is excellent in both corrosion resistance before electrodeposition coating, and weldability.

Coated steel sheet and painted member

A metal sheet for containers includes a metal sheet and a polyester film which is laminated on a surface of the metal sheet to be an inner surface side of containers. The polyester film contains a wax in an amount of 0.010 to 2.000 mass %, and has a dipole-dipole force of 40 mN/m or less.

Metal sheet for containers and method for manufacturing same

A film-laminated metal plate having excellent retort adhesiveness includes: a metal plate; a resin film thermally fusion-bonded to a surface of the metal plate; and a bubble contained between the metal plate and the resin film. An average bubble height of three bubbles with higher heights among the bubbles measured by using a 3D analysis image of a laser microscope is 0 &#x3bc;m or more and 5.0 &#x3bc;m or less. The test piece is obtained by cutting a portion of one end side of the metal plate in a longitudinal direction while leaving the resin film on a side which becomes an inner surface side of the container when the film-laminated metal plate is processed into a container. When a retort treatment is carried out on the test piece at a temperature of 125&#xb0; C. for 30 minutes in a state in which a 100 g weight is hung from the one end side of the test piece and the test piece is folded back toward the other end side of the test piece in the longitudinal direction by 180&#xb0;, a length of the resin film peeled off from the metal plate of the test piece is 15 mm or less.

Film-laminated metal plate having excellent retort adhesiveness, and method for manufacturing same

Provided are a surface-treated metal sheet excellent in the adhesiveness to a coating treatment film and weldability and a coated member. The surface-treated metal sheet includes a metal sheet and a coating film placed on at least one major surface of the metal sheet; the coating film contains oxide particles, a binder resin, and electrically conductive particles; the amount of electrically conductive particles contained is 5 to 30 mass % relative to the coating film; the oxide particles include non-doped oxide particles and/or doped oxide particles; the non-doped oxide particles include at least one kind selected from the group consisting of zinc oxide particles, tin oxide particles, magnesium oxide particles, calcium oxide particles, and strontium oxide particles; the doped oxide particles include at least one kind selected from the group consisting of doped zinc oxide particles and doped tin oxide particles; the amount of oxide particles contained is 1 to 30 mass %, but is 1 to 10 mass % relative to the coating film in the case of not including doped oxide particles; and the amount of the coating film attached to the major surface is 2 to 20 g/m.

Surface-treated metal sheet, coated member, and method for producing coated member

Provided is a coated metal sheet for automobile comprising: a metal sheet; and a coating film (&#x3b1;) present on at least one surface of the metal sheet. The coating film (&#x3b1;) contains an organic resin (A), an electrically conductive pigments (B), and anti-corrosion pigments (C), and a Martens micro-hardness HM at &#x2212;20&#xb0; C. of the surface of the coating film (&#x3b1;) is 10 to 200 (mg/mm) at 20 points or more when measured at 100 points, and a Martens micro-hardness HM at 40&#xb0; C. of the surface of the coating film (&#x3b1;) is 200 to 200,000 (mg/mm) at 5 points or more when measured at 100 points.

Coated metal sheet for automobile excellent in rust resistance in low temperature running environments

Growing community of inventors

Tokyo, Japan

Yoichiro Mori