Bridgestone Corporation

Nippon Steel Corporation

Nippon Steel Sumitomo Metal Corporation

Kissei Pharmaceutical Co., Ltd.

Other

Eiji Tsuru

Hitoshi Asahi

Yasushi Hasegawa

Yasuhiro Shinohara

Takuya Hara

Masaharu Oka

Hideki Takeuchi

Shigekatsu Ozaki

Yukinobu Nagata

Kazushi Maruyama

Haruyuki Nagayoshi

Tatsuya Yoshida

Yuichi Sato

Shinji Uchida

Hiroshi Morimoto

Akira Nakashima

Tetsuro Tamai

Yoshio Terada

Nobuyuki Tanaka

Mitsuru Sawamura

Seijun Higuchi

Naoki Nishimura

Kiyoshi Kasai

Hitoshi Akiyama

Michio Toda

Junichi Sonehara

Koji Nakayama

Taishi Fujishiro

Ryusuke Inoue

Shunji Nishi

Masao Ogasawara

Jun Agata

Hideki Miyazaki

Toshio Akiyama

Kouichi Shinada

Kazumi Sagara

Kazuma Hirata

A pipeline is a pipeline having plural weld zones in which ends of plural steel pipes are joined by welding, the plural steel pipes are produced from plural charges of molten steel having one or more steel compositions; yield point elongation is not present on a stress-strain curve obtained when stress is applied in a longitudinal direction of each of the steel pipes; a thickness of each of the steel pipes t (mm) and an average pipe outside-diameter D (mm) satisfy t/D&#xd7;100&#x2264;6; and in the plurality of the weld zones, &#x394;YS which is a yield strength difference between one steel pipe and the other steel pipe that are welded to each other (MPa), and YR representing a yield ratio that is a ratio of the yield strength to tensile strength of a pipe having a low yield strength out of the one steel pipe and the other steel pipe, satisfy &#x394;YS&#x2264;&#x2212;1.75&#xd7;YR+230.

Pipeline and manufacturing method thereof

A pipeline is a pipeline having plural weld zones in which ends of plural steel pipes are joined by welding, the plural steel pipes are produced from plural charges of molten steel having one or more steel compositions; yield point elongation is not present on a stress-strain curve obtained when stress is applied in a longitudinal direction of each of the steel pipes; a thickness of each of the steel pipes t (mm) and an average pipe outside-diameter D (mm) satisfy t/D&#xd7;100&#x2266;6; and in the plurality of the weld zones, &#x394;YS which is a yield strength difference between one steel pipe and the other steel pipe that are welded to each other (MPa), and YR representing a yield ratio that is a ratio of the yield strength to tensile strength of a pipe having a low yield strength out of the one steel pipe and the other steel pipe, satisfy &#x394;YS&#x2266;&#x2212;1.75&#xd7;YR+230.

A steel pipe with dual phase structure includes, as chemical composition, by mass %, C: 0.07% to 0.15%, Si: 0.1% to 0.5%, Mn: 0.8% to 1.9%, Nb: 0.020% to 0.10%, P: limited to 0.05% or less, S: limited to 0.01% or less, Al: limited to 0.1% or less, and a balance consisting of iron and unavoidable impurities, wherein, when [X] is amount of element X in mass %, carbon equivalent Ceq defined by Equation of Ceq=[C]+[Mn]/6 is 0.25 to 0.40 and [Nb]&#xd7;[C]&#x2267;0.002 is satisfied, and includes, as metallographic structure, by area %, ferrite of 80% to 98% and martensite, residual austenite, or mixture thereof of 2% to 20% in total, wherein average grain size of ferrite is 1 &#x3bc;m to less than 8 &#x3bc;m and average grain size of martensite, residual austenite, or mixture thereof is 0.1 &#x3bc;m to 2 &#x3bc;m.

Oil country tubular goods with dual phase structure and producing method thereof

A liquid phase diffusion bonded pipe joint comprised of metal pipes or a metal pipe and a joint pipe joined by liquid phase diffusion bonding, the liquid phase diffusion bonded pipe joint comprised of a metal joint provided with a tapered slanted part press-fit into an end of a metal pipe by a thrust in a pipe axial direction while expanding the metal pipe in inside diameter and tightly engaging with the end and a joining surface part continuing from the tapered slanted part and joined with an end face of the metal pipe by liquid phase diffusion bonding and a metal pipe tightly engaging with the tapered slanted part in the expanded state and with an end face joined with the joining surface part by liquid phase diffusion bonding.

Liquid phase diffusion bonded pipe joint

The present invention provides steel plate or steel pipe with small occurrence of the Bauschinger effect and methods of production of the same, particularly steel pipe used for steel pipe for oil wells or line pipe with a small drop in the compression strength in the circumferential direction due to the Bauschinger effect when expanded and methods of production of the same, that is steel plate or steel pipe with small occurrence of the Bauschinger effect characterized by having a dual-phase structure substantially comprising a ferrite structure and fine martensite which is dispersed in the ferrite structure. Further, this steel plate or steel pipe contains, by mass %, C: 0.03 to 0.30%, Si: 0.01 to 0.8%, Mn: 0.3 to 2.5%, P: 0.03% or less, S: 0.01% or less, Al: 0.001 to 0.01%, and N: 0.01% or less and a balance of iron and unavoidable impurities.

Steel plate or steel pipe with small occurrence of Bauschinger effect and methods of production of same

The present invention provides a high strength welded steel pipe superior in weld zone embrittlement crack characteristics and a method of production of the same, that is, a method of production of a welded steel pipe superior in hydrogen embrittlement cracking resistance of weld metal characterized by seam welding from the inner and outer surfaces by a tensile strength of 850 MPa or more, then expanding or reducing the size of the pipe for correction, which method of production of welded steel pipe characterized in that the hydrogen concentration of the preceding weld metal is 0.2 cc or less per 100 g at ordinary temperature.

High strength welded steel tube superior in hydrogen embrittlement cracking resistance of weld metal and method of production of same

The present invention provides a novel form of 3-(3-{4-[3-(&#x3b2;-D-glucopyranosyloxy)-5-isopropyl-1H-pyrazol-4-ylmethyl]-3-methylphenoxy}propylamino)-2,2-dimethylpropionamide with improved storage stability. Since bis[3-(3-{4-[3-(&#x3b2;-D-glucopyranosyloxy)-5-isopropyl-1H-pyrazol-4-ylmethyl]-3-methylphenoxy}propylamino)-2,2-dimethylpropionamide]monosebacate has extremely excellent storage stability, it is useful as a drug substance. Furthermore, it shows an extremely good crystalline property and can be purified by a convenient method, and therefore is suitable for the industrial preparation.

Monosebacate of pyrazole derivative

The present invention provides a novel form of 3-(3-{4-[3-(&#x3b2;-D-glucopyranosyloxy)-5-isopropyl-1H-pyrazol-4-ylmethyl]-3-methylphenoxy}propylamino)-2,2-dimethylpropionamide with improved storage stability. Since 3-(3-{4-[3-(&#x3b2;-D-glucopyranosyloxy)-5-isopropyl-1H-pyrazol-4-ylmethyl]-3-methylphenoxy}-propylamino)-2,2-dimethylpropionamide hemifumarate dihydrate has extremely excellent storage stability, it is useful as a drug substance. Furthermore, it shows an extremely good crystalline property and can be purified by a convenient method, and therefore is suitable for the industrial preparation.

Hemifumarate of a pyrazole derivative

The present invention relates to UOE steel pipe excellent in collapse characteristics formed by the UOE production method and a method for forming this UOE steel pipe, said UOE steel pipe characterized in that a ratio between compression and tension of yield strength in the circumferential direction is at least 1.05 near the inside surface and is at least 0.9 to not more to 1.0 from the center of plate thickness to the outside surface.

UOE steel pipe excellent in collapse strength and method of production thereof

A rubber crawler has a structure in which connecting members are sequentially fitted onto wing portions adjacent to each other without using steel cords for resisting tensile force applied to the rubber crawler. Accordingly, the rubber crawler of the present invention has excellent characteristics in that breakage of steel cords due to the tensile force can be prevented, and torsion of the rubber crawler can be reduced.

Rubber crawler

The present invention provides a method of production of oil country tubular goods having a small drop in collapse pressure after expansion and having a collapse pressure recovering by low temperature ageing at about 100&#xb0; C. and oil country tubular goods obtained by this method of production. This method of production comprises hot rolling a steel slab having amounts of addition of C, Mn, P, S, Nb, Ti, Al, and N in specific ranges and having a balance of iron and unavoidable impurities and shaping the steel strip coiled at a temperature of not more than 300&#xb0; C. as it is into a tube. Alternatively, it comprises heating steel pipe having amounts of addition of C, Mn, P, S, Nb, Ti, Al, and N in specific ranges and having a balance of iron and unavoidable impurities to a temperature of the Ac[&#xb0; C.] to 1150&#xb0; C., then cooling it in a range of 400 to 800&#xb0; C. at a rate of 5 to 50&#xb0; C./second.

Oil country tubular goods excellent in collapse characteristics after expansion and method of production thereof

An elastic endless includes an annular belt-shaped elastic crawler body and a plurality of cords with ends, the cords being disposed substantially parallel with one another at predetermined intervals and embedded in the crawler body, wherein one end and the other end of each cord are overlapped, as seen from the belt side.

Elastic endless crawler and method of manufacturing the same

A core-less rubber crawler has a guide protrusion protruding from an internal surface of a rubber main body in the shape of an endless belt, and the protrusion extends in the lengthwise direction of the rubber main body at the center with respect to the widthwise direction thereof, and ground contacting lugs are provided on the rubber main body characterized in that non-ground contacting areas are formed on the ground contacting lugs correspondingly to a region where the guide protrusion is provided. By the existence of the non-ground contacting area of the ground contacting lugs correspondingly to the place where the guide protrusion is provided, no ground contacting repulsive force is received in the non-ground contacting area. Therefore, it is possible to restrict the shearing force in the vicinity of the basal part of the guide protrusion.

The object of the invention is to provide a rubber crawler which has an excellent driving performance without rubber breakage and a process for manufacturing the same. The object is attained by firstly obtaining a small bending rigidity of a joint part and eliminating disproportional arrangement of main cord embedded in the rubber crawler in a widthwise direction for obtaining durability, and uniform revolution. In a rubber crawlerin the form of an endless belt having an inserting joint structure S wherein ends of a number of parallel reinforcing cordsas main cords embedded in the rubber crawler are inserted between each other, the number of reinforcing cords are divided in an even number (2 in the embodiments shown with figures) parts, the ends partsAtoAandBtoBextending in both directions are arranged axisymmetrically about the dividing line L. Accordingly, the inserting joint structure S is obtained as a prerequisite which is on a same plane when viewed from the side. Furthermore, it is possible to eliminate disproportional arrangement of the main cords to be embedded. As a result, driving performance is improved, and rubber breakage is prevented, whereby it is possible to further increase the durability.

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Futtsu, Japan

Eiji Tsuru