Chuo-ku, Japan
Chuo-ku, Japan

Kobe Steel, Ltd. , operating worldwide under the brand Kobelco, is a major Japanese steel manufacturer headquartered in Chuo-ku, Kobe. Kobe Steel also has a stake in Osaka Titanium Technologies.It was formed on September 1, 1905. Its location in a major city port was useful for importing and exporting iron ore and coal. Kobe Steel is the owner of the rugby team Kobe Steel Kobelco Steelers.The company is listed on the Tokyo and Nagoya Stock Exchange, on the Osaka Securities Exchange and is a constituent of the Nikkei 225 stock index. As of March 31, 2014, the company has 208 subsidiary and 62 affiliated companies across Japan, Asia, Europe, the Middle East and the US. Wikipedia.

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A manufacturing method of press-formed article according to the present invention includes a step of placing a flat plate member between a first die and a second die, and a step of causing a first press portion and a second press portion approach each other, thereby pressing the flat plate member. In the step of placing, the flat plate member is placed so that a first main surface and a second main surface align with a vertical direction. In the step of pressing, the flat plate member is vertically pressed by causing the first press portion and the second press portion to approach each other in the vertical direction, and a thick portion is formed on the flat plate member by causing a part of a material of the flat plate member in the vertical direction to flow into a thickened portion-forming section formed on a first opposing surface.


A manufacturing method of press-molded article of the present invention comprises a step of placing a member to be pressed in a press molding apparatus and a step of pressing a flat plate portion of the member to be pressed by bringing a first press portion and a second press portion closer to each other. A first opposing surface and a second opposing surface, while facing to each other, keep in contact with the flat plate portion during pressing. In the press step, a thick part is formed on the flat plate portion by allowing a part of a material of the flat plate portion to flow, in a press direction, into a thickened portion-forming section formed on the first opposing surface. The second opposing surface is moved to the press direction as the flat plate portion is pressed by the first press portion and the second press portion.


Provided are a welded titanium tube (1) capable of improving heat-transfer performance and detecting surface defects and a manufacturing method therefor. The welded titanium tube (1) is formed of a tubular-shaped titanium plate, whose edges are butt-welded. The welded titanium tube (1) includes an outer peripheral surface and an inner peripheral surface, at least one of which is provided with a concavo-convex pattern including a base surface (3) and a plurality of protrusions (2). A mean maximum height of the protrusions (2) is in the range of 12 to 45 m. A ratio of a maximum value to a mean pitch of the protrusions (2) is less than 2. A ratio of a mean maximum dimension of the protrusions (2) to the mean pitch is 0.90 or less, and a ratio of the mean maximum height to a wall thickness is 0.11 or less.


Patent
Kobe Steel | Date: 2017-03-29

Disclosed is a steel plate. The steel plate has a chemical composition meeting predetermined conditions. A microstructure in the surface layer of the steel plate includes at least one of ferrite and upper bainite in a total fraction of 80 area percent or more, and grains of the at least one of ferrite and upper bainite have an effective grain size of 10.0 m or less. Of the microstructure of the surface layer, grains of the remainder microstructure excluding the ferrite and the upper bainite have an average equivalent circle diameter of 3.0 pm or less. The steel plate has a dislocation density of 2.510^(15) m^(-1) or less as determined by X-ray diffractometry. The steel plate having the configuration has excellent fatigue properties.


The present invention provides a steel material, such as a high-strength spring, that has excellent fatigue properties, and, more specifically, a steel material, such as the high-strength spring, that can improve the fatigue properties in a high-strength region more easily, without increasing an alloy cost. The steel material includes, in percent by mass, C: 0.5 to 1.0%, Si: 1.5 to 2.50%, Mn: 0.5 to 1.50%, P: more than 0% to 0.020% or less, S: more than 0% to 0.020% or less, Cr: more than 0% to 0.2% or less, Al: more than 0% to 0.010% or less, N: more than 0% to 0.0070% or less, and O: more than 0% to 0.0040% or less, and the balance consisting of iron and inevitable impurities, wherein Cr and Si contents satisfy a formula of Cr Si 0.20, a ratio of tempered martensite in a steel microstructure is 80% or more by area, and a number density of particles of Cr-containing carbide or carbonitride having a circle-equivalent diameter of 50 nm or more in the steel microstructure is 0.10 particles/m^(2) or less.


Patent
Kobe Steel | Date: 2017-09-13

To reduce the oxygen content of an Al-Nb-Ti alloy containing 50-75 mass% of Al, 5-30 mass% of Nb, and 80 mass% or less as the total of Al and Nb, the Al-Nb-Ti alloy being produced using an alloy material that comprises an Al material, an Nb material, and a Ti material and contains a total of 0.5 mass% or more of oxygen, by using a dissolution method using a water-cooled copper container to dissolve and hold the Al-Nb-Ti alloy in a 1.33 Pa-2.67 x 10^(5) Pa atmosphere at a temperature of 1900K or higher.


A stacked type fluid heater includes a first low temperature layer with low temperature side flow passages into which target medium to be heated is introduced, a first high temperature layer with high temperature side flow passages into which heating medium for heating the target medium to be heated is introduced, a second high temperature layer with high temperature side flow passages into which the heating medium is introduced. The target medium has a temperature lower than the freezing point of the heating medium. The first high temperature layer includes the high temperature side flow passages located adjacent each other via a metal material of the first high temperature layer. The high temperature side flow passages of the first high temperature layer and those of the second high temperature layer are adjacent each other via a metal material of the second high temperature layer.


Patent
Kobe Steel | Date: 2017-09-27

In the present invention, a steel plate contains specific alloy components, has a steel structure that contains specific proportions of retained austenite and ferrite, with the remainder comprising one or more types selected from among bainite, martensite, tempered bainite and tempered martensite, and has a specific average carbon concentration and carbon concentration distribution in the retained austenite.


The purpose of the present invention is to provide: an aluminum alloy material which is not susceptible to decrease in the bonding strength even if exposed to a high-temperature humid environment, while having excellent bonding durability; a bonded body; a member for automobiles; and a method for producing an aluminum alloy material. In a method for producing an aluminum alloy material according to the present invention, when a first film that is composed of an oxide film is formed on the surface of an aluminum alloy base (first film formation step), the etching amount is controlled to be less than 700 nm, and after the formation of the first film by a treatment with use of an aqueous solution containing a silicate salt, said treatment being the final stage of the substantial film formation in this step, a second film having a siloxane bond is formed by performing a silane coupling treatment (second film formation step).


Patent
Kobe Steel | Date: 2017-09-13

[Object] To enable a gas supply system to be easily transported and to increase a degree of freedom when the gas supply system is installed. [Solution] A hydrogen station includes: a filling facility for filling a tank-mounted device with a gas; and a gas supply system for supplying the gas to the filling facility. The gas supply system includes: a compressor for compressing the gas; a compressor accommodating body for accommodating the compressor; a refrigerator for cooling the gas flowed into the filling facility or the gas just before being flowed into the filling facility, the refrigerator including an evaporation part, an expansion part, and a compression part; and a cooler accommodating body for accommodating the evaporation part, the expansion part, and the compression part. The compressor accommodating body and the cooler accommodating body are detachable from each other.

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