Kobe Steel, Ltd.

Kabushiki Kaisha Kobe Seiko Sho (kobe Steel, Ltd.)

Kabushiki Kaisha Kobe Seiko Sho

Mikako Takeda

Takashi Onishi

Katsushi Matsumoto

Wataru Urushihara

Jun Katoh

Mamoru Nagao

Masao Kinefuchi

Masao Mizuno

Hidenori Sakai

Tomotada Maruo

Kenji Yamamoto

Miki Moriyama

Masanori Murakami

Takeshi Kuroda

Takuya Kochi

Takaaki Minamida

Susumu Tsukimoto

Kazuhiro Ito

Seiichiro Ohmoto

Shohei Nakakubo

Tatsuya Kabe

Toshifumi Morita

Hidekazu Ido

Koji Fukumoto

Hirofumi Hojo

Tsuyoshi Matsumoto

Tomokazu Nakagawa

Yasuaki Sugizaki

Fumio Yuse

Seiji Sasabe

Hiroyuki Takeda

Mamoru Hosokawa

Shigenobu Namba

Tomotsuna Kamijo

Kazuya Kimijima

Yasuo Murai

Shinobu Nakayama

Masumi Nishimura

Ryo Sasaki

Kazuhiko Kirihara

Masayuki Endo

Seiji Morishige

Yoshihiro Miyake

Ryosuke Otomo

The present invention is a production method of a hot-dip galvanized steel sheet including annealing a belt-shaped steel sheet having a Si content of greater than or equal to 0.2% by mass, wherein the annealing is continuously carried out using an annealing furnace having an oxidation heating zone and a reduction heating zone in this order, while the steel sheet is fed using rollers. The annealing includes oxidizing a surface of the steel sheet in the oxidation heating zone at a temperature at which roll pickup does not occur and reducing an iron oxide layer, formed by the oxidizing, in the reduction heating zone before the iron oxide layer reaches an initial roller in the reduction heating zone.

Production method of hot-dip galvanized steel sheet

A powder for a powder magnetic core, being composed of iron-base soft magnetic powder particles which each have a phosphoric acid-based chemical conversion coating on the surface. In this powder, the maximum thickness of the phosphoric acid-based chemical conversion coating is 20 to 200 nm, and recessed portions are formed on the surface of the chemical conversion coating with the total area of openings of the recessed portions being 0.5 to 50% by area relative to the total area of the observation visual fields, as determined by observing ten or more parts of the surface of the phosphoric acid-based chemical conversion coating through a scanning electron microscope with a magnification of 10000&#xd7; or more.

Powder for powder magnetic core, and powder magnetic core

A method for manufacturing a press-formed article, said method comprising forming a galvanized steel sheet or an alloyed hot-dip galvanized steel sheet by hot press forming, wherein, after heating the steel sheet and holding the same, the forming is started at a temperature of 680-750&#xb0; C. inclusive, while allowing liquid zinc to remain on the surface of the steel sheet, and the forming is performed while regulating the strain rate in a plastic deformation part of the steel sheet to 0.5 secor lower.

Press-formed article and method for manufacturing same

A method of manufacturing a steel wire material that contains 0.05%-1.2% C ('%' means '% by mass,' same hereinafter for chemical components.), 0.01%-0.7% Si, 0.1%-1.5% Mn, 0.02% max. P (not including 0%), 0.02% max. S (not including 0%), and 0.005% max. N (not including 0%), with the remainder being iron and unavoidable impurities. The steel wire material has a scale 6.0-20 &#x3bc;m thick and holes of an equivalent circle diameter of 1 &#x3bc;m max. in said scale that occupy 10% by area max. Said scale does not detach in the cooling process after hot rolling or during storage or transportation but can readily detach during mechanical descaling.

Steel wire material and method for manufacturing same

There are provided a flux cored wire for joining dissimilar materials with each other, capable of enhancing a bonding strength upon joining an aluminum-base material with a steel-base material, and excellent in bonding efficiency, a method for joining the dissimilar materials with each other, and a bonded joint obtained by the method. In particular, there is provided a method for joining dissimilar materials with each other, in the case of melt weld-bonding of high-strength dissimilar materials with each other, that is, the high-strength steel member with the high-strength 6000 series aluminum alloy member and in the case of the steel member being a galvanized steel member. In one mode, use is made of a flux cored wire wherein the interior of an aluminum alloy envelope is filled up with a flux, the flux has fluoride composition containing a given amount of AlFwithout containing chloride, and the aluminum alloy of the envelope contains Si in a range of 1 to 13 mass %. If such a flux cored wire is use, it is possible to obtain a high bonding strength in the case of melt weld-bonding of high-strength dissimilar materials with each other, that is, the high-strength steel member with the high-strength 6000 series aluminum alloy member.

Flux-cored wire for different-material bonding and method of bonding different materials

A galvannealed steel sheet obtained by subjecting a base steel sheet to hot-dip galvanization and then alloying the galvanization layer, the base steel sheet being obtained by hot rolling a specified steel. A method for producing the galvannealed steel sheet.

Galvannealed steel sheet and production method thereof

Provided is a joint product of a steel product and an aluminum material, the joint product being formed by joining the steel product having a sheet thickness tof 0.3 to 3.0 mm with the aluminum material having a sheet thickness tof 0.5 to 4.0 mm by spot welding, wherein a nugget area in a joint part is from 20&#xd7;tto 100&#xd7;tmm, an area of a portion where a thickness of an interface reaction layer is from 0.5 to 3 &#x3bc;m is 10&#xd7;tmmor more, and a difference between the thickness of the interface reaction layer at a joint part center and the thickness of the interface reaction layer at a point distant from the joint part center by a distance of one-fourth of a joint diameter is 5 &#x3bc;m or less, and wherein the aluminum material is pure aluminum or an aluminum alloy material.

Joint product between steel product and aluminum material, spot welding method for the joint product, and electrode chip for use in the joint product

The present invention aims at providing a method for production of a steel product which surely retains scale during cooling, storage, and transportation and permits scale to scale off easily at the time of mechanical descaling and pickling that precede the secondary fabrication. The steel product is produced by heating and hot rolling a steel billet and spraying the hot-rolled steel product with steam and/or water mist having a particle diameter no larger than 100 &#x3bc;m, for surface oxidation.

Method for production of steel product with outstanding descalability; and steel wire with outstanding descalability

A joined body of dissimilar metals which is produced by joining a steel material and an aluminum alloy material, wherein the steel material to be joined has a specific composition and is specified in the compositions of outer surface oxide layer and inner oxide layer and the aluminum alloy material to be joined is an Al&#x2014;Mg-base or Al&#x2014;Zn&#x2014;Mg-base aluminum alloy having a specific composition. In the joined body of dissimilar metals, a content of Fe at a joint interface on the aluminum alloy material side is regulated, and a reaction layer of Fe and Al is formed at the joint interface of the joined body of dissimilar metals. The joined body of dissimilar metals exhibits high joint strength.

Steel material for dissimilar metal joining, joined body of dissimilar metals and process for joining dissimilar metal materials

A joined body of dissimilar metals which is produced by joining a steel material and an aluminum alloy material, wherein the steel material to be joined has a specific composition and is specified in the compositions of outer surface oxide layer and inner oxide layer and the aluminum alloy material to be joined is an Al&#x2014;Mg&#x2014;Si-base aluminum alloy having a specific composition. In the joined body of dissimilar metals, a content of Fe at a joint interface on the aluminum alloy material side is regulated, and a reaction layer of Fe and Al is formed at the joint interface of the joined body of dissimilar metals. The joined body of dissimilar metals exhibits high joint strength.

An FeO layer including fine crystal grains having random orientation is formed as inner layer scale on the surface of the steel wire rod containing C: 0.05-1.2 mass % (hereinafter referred to as '%'), Si: 0.01-0.50%, Mn: 0.1-1.5%, P: 0.02% or below, S: 0.02% or below, N: 0.005% or below, an FeSiOlayer with the thickness: 0.01-1.0 &#x3bc;m is formed in the boundary face between the FeO layer of the inner layer scale and steel, and the thickness of the inner layer scale is 1-40% of the total scale thickness. In another aspect, the maximum grain size of the crystal grain of the inner layer scale is 5.0 &#x3bc;m or below and the average grain size is 2.0 &#x3bc;m or below.

Steel wire rod

To provide a steel-aluminum welded material and a spot welding method therefor having high weld strength. The steel-aluminum welded materialincludes a steel materialand an aluminum materialhaving predetermined widths. The area of a nuggetof a spot-welded part is determined as a function of the thickness of the aluminum material, and the area of a part of the nuggetcorresponding to a part having a thickness in a range between 0.5 and 10 &#x3bc;m of an interface reaction layeris defined as a function of the thickness of the aluminum material

Joined body of dissimilar materials comprising steel material and aluminum material, and joining method therefor

A metal thin film used in fabricating a damascene interconnection of a semiconductor device which exhibits excellent high temperature fluidity during high pressure annealing, and which can fabricate an interconnection for a semiconductor device which has a low electric resistance and stable high quality is provided. Also provided is an interconnection for a semiconductor device. More specifically, a metal thin film for use as an interconnection of a semiconductor device comprising a Cu alloy containing N at a content of not less than 0.4 at % to not more than 2.0 at %; and an interconnection for a semiconductor device fabricated by forming the metal thin film on an insulator film which is formed on a semiconductor substrate and which has grooves formed therein, and filling the metal thin film in the interior of the grooves by a high pressure annealing process are provided.

Metal thin film for interconnection of semiconductor device

A method of fabricating semiconductor interconnections is provided which can form a Ti-rich layer as a barrier layer and which can embed pure Cu material as interconnection material into every corner of grooves provided in an insulating film even when the grooves have a narrow minimum width and are deep. The method may include the steps of forming one or more grooves in an insulating film on a semiconductor substrate, the recess having a minimum width of 0.15 &#x3bc;m or less and a ratio of a depth of the groove to the minimum width thereof (depth/minimum width) of 1 or more, forming a Cu alloy thin film containing 0.5 to 10 atomic % of Ti in the groove of the insulated film along a shape of the groove in a thickness of 10 to 50 nm, forming a pure Cu thin film in the groove with the Cu alloy thin film attached thereto, and annealing the substrate with the films at 350&#xb0; C. or more to allow the Ti to be precipitated between the insulating film and the Cu alloy thin film.

Method of fabricating semiconductor interconnections

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Kobe, Japan

Mikako Takeda