Nippon Steel Corporation

Nippon Steel Sumitomo Metal Corporation

Asahi Kasei Kabushiki Kaisha

Nihon Micro Coating Co., Ltd.

Nec Corporation

Kaneka Corporation

Sumitomo Metal Industries, Inc.

Tajima Ryokka Incorporated

Akihiro Sakamoto

Yuji Arai

Tomohiko Omura

Kazuo Okamura

Haruka Obe

Yasuhiko Daimon

Kenji Yamamoto

Keiichi Kondo

Kaori Kawano

Yoshihito Yaginuma

Nobuyoshi Mochihara

Jun Tamura

Noriyuki Kumasaka

Nobuyuki Mori

Kazuhiro Shimoda

Yuji Horie

Naoaki Shimada

Takuji Nomura

Yoshihiro Serizawa

Hideki Matsuda

Hiroaki Kubota

Masahito Tasaka

Toru Kojima

Kouji Yamane

Norimasa Yamasaki

Satoru Sato

Masanao Seo

Kazuo Uematsu

Kunio Tajima

Kouichirou Enatsu

Yoshiteru Nitta

Koji Nagahashi

Yoshiyuki Kuroiwa

Yoshiaki Gotou

Yurika Tanaka

Tetsuya Ootani

Mitsuyo Akimoto

Tsuneo Tajima

Takayoshi Imai

Tooru Kojima

Takuji Hashimoto

Yasushi Kawamura

Yuka Itou

Kouichi Noda

Ryuji Hamada

Mikio Tatsuoka

Yasuyuki Yokota

A piercing machine includes a plurality of skewed rolls, a plug, a mandrel bar and an outer surface cooling mechanism. The outer surface cooling mechanism is disposed around the mandrel bar at a position that is rearward of the plug, and with respect to an outer surface of a hollow shell advancing through a cooling zone which has a specific length in an axial direction of the mandrel bar and which is located rearward of the plug, as seen from an advancing direction of the hollow shell, the outer surface cooling mechanism ejects a cooling fluid toward an upper part of the outer surface, a lower part of the outer surface, a left part of the outer surface and a right part of the outer surface of the hollow shell to cool the hollow shell inside the cooling zone.

Piercing machine, and method for producing seamless metal pipe using the same

The production method of a seamless steel pipe includes a heating step of heating an Nb-containing steel material to 800 to 1030&#xb0; C., a pipe-making step of producing a hollow shell by performing piercing-rolling or elongation-rolling on the Nb-containing steel material, by using a piercing mill including a plurality of skewed rolls, a plug disposed between the plurality of skewed rolls, and a mandrel bar, and a cooling step immediately after rolling, of carrying out cooling using a cooling liquid on a hollow shell portion that passes between rear ends of the plurality of skewed rolls, in the hollow shell, so as to reduce an outer surface temperature of the hollow shell portion to 700 to 1000&#xb0; C. within 15.0 seconds after the hollow shell portion passes between the rear ends of the plurality of skewed rolls.

Production method of seamless steel pipe

A mandrel bar of a piercing machine includes: a bar body; a coolant channel formed inside the bar body and through which a coolant flows; an inner surface cooling mechanism which is disposed in a cooling zone and is connected to the coolant channel and which, during piercing-rolling or during elongating rolling, ejects the coolant to outside of the bar body to cool an inner surface portion of a hollow shell inside the cooling zone; and an inner surface damming mechanism which is disposed adjacent to the cooling zone on a rearward side of the cooling zone and which, during piercing-rolling or during elongating rolling, suppresses the coolant that is ejected to outside of the bar body from contacting the inner surface portion of the hollow shell that is positioned rearward of the cooling zone.

Piercing machine, mandrel bar, and method for producing seamless metal pipe using the same

According to the present invention, there is provided a cooling apparatus for a steel material in which one portion in a longitudinal direction of an elongated steel material () is heated while the steel material is fed in the longitudinal direction in a state where one end portion of the steel material is gripped, and the one end portion is moved in a two-dimensional or three-dimensional direction so as to form the steel material into a predetermined shape including a bent portion and thereafter to cool a heated portion including the bent portion. The cooling apparatus includes a first cooling apparatus () that ejects a first cooling medium to the heated portion, and a second cooling apparatus () that is disposed on a downstream side from the first cooling apparatus when viewed along a feeding direction of the steel material, and that ejects a second cooling medium to the heated portion. A plurality of the second cooling apparatuses are disposed along the feeding direction, and flow rates of the second cooling media can be controlled independently of each other. According to the configuration, it is possible to reduce the insufficient quenching of the steel material.

Cooling apparatus and cooling method for steel material

A heat treatment apparatus of one aspect of the present disclosure includes: a feed device that feeds a heat treatment workpiece downstream in a feed direction along a heat treatment workpiece pass-line; a heating device that includes a heating coil disposed downstream of the feed device in the feed direction and encircling the pass-line; a cooling device that is disposed adjacent to the heating coil, downstream of the heating coil in the feed direction, and encircling the pass-line; and a gas supply device that is disposed upstream of the heating coil in the feed direction, directly connected to the heating coil and encircling the pass-line, and that includes a plurality of gas compartments configured by internally partitioning the gas supply device in the feed direction.

Heat treatment apparatus, heat treatment method for steel workpiece, and hot bending method for steel workpiece

A steel for oil country tubular goods includes, as a chemical composition, by mass %, C, Si, Mn, Al, Mo, P, S, O, N, and a balance containing Fe and impurities, wherein a full width at half maximum HW of a crystal plane corresponding to a () crystal plane of an &#x3b1; phase and a carbon content expressed in mass % in the chemical composition satisfy HW&#xd7;C&#x2264;0.38, the carbon content and a molybdenum content expressed in mass % in the chemical composition satisfy C&#xd7;Mo&#x2265;0.6, a number of MC carbides having a hexagonal crystal structure and having an equivalent circle diameter of 1 nm or more is 5 pieces or more per one square micron, and an yield strength is 758 MPa or more.

Steel for oil country tubular goods and method of producing the same

The low alloy steel for oil country tubular goods according to the present invention has a chemical composition containing, by mass percent, C: 0.56 to 1.00%, Si: 0.05 to 0.50%, Mn: 0.05 to 1.00%, P: at most 0.025%, S: at most 0.010%, Al: 0.005 to 0.100%, Mo: 0.40 to 1.00%, V: 0.05 to 0.30%, and O: at most 0.010%, the balance being Fe and impurities, wherein the yield stress thereof is at least 862 MPa, and the half-value width of a [211] crystal surface obtained by X-ray diffraction is at most 0.50&#xb0;.

Method for producing a low alloy steel for oil country tubular goods having excellent sulfide stress cracking resistance

A method for quenching a steel pipe by water cooling from an outer surface thereof, where pipe end portions are not subjected to water cooling, and at least part of a main body other than the pipe end portions is subjected to water cooling. A region(s) that is not subjected to direct water cooling over an entire circumference thereof can be along an axial direction at least in part of the main body other than the pipe end portions. The start and stop of water cooling can be intermittent at least in part of the quenching. During the water cooling of the pipe outer surface, an intensified water cooling can be performed in a temperature range in which the pipe outer surface temperature is higher than Ms point. Thereafter, the cooling can be switched to moderate cooling so that the outer surface is cooled down to Ms point or lower.

Quenching method for steel pipe

An object of the present invention is to provide air cooling equipment for a heat treatment process for a martensitic stainless steel pipe, which is capable of shortening the time required for the heat treatment process by enhancing the cooling efficiency at the time when the inner surface of steel pipe is air cooled in the heat treatment ent process. Air cooling equipmentfor a heat treatment process for a martensitic stainless steel pipe P in accordance with the present invention comprises: a conveying devicefor intermittently conveying the steel pipe P in the direction substantially at right angles to the longitudinal direction of the steel pipe P; and an air cooling deviceprovided with a nozzlefor spraying air Bi toward the inner surface of the steel pipe P, the nozzlebeing arranged along the longitudinal direction of the steel pipe P at a stop position of the steel pipe P intermittently conveyed by the conveying deviceso as to face to an end of the steel pipe P.

Air cooling equipment for heat treatment process for martensitic stainless steel pipe or tube

To realize a root-preventing sheet with outstanding shape maintaining properties while being thin and light that even when affixed has no wrinkles, is difficult to tear, has excellent applicability, durability and adhesiveness and demonstrates definite root-preventing effects at low cost. The above problem is resolved by realizing a root-preventing layer structure set up on the construction surface of the soil layer that the plant is planted in and which prevents extrusion into the outer part of the soil layer of the plant root comprising: a resin film having the strength to be able to prevent extrusion of the plant root affixed to the construction surface; and an adhesive layer formed on the back face of the resin film, wherein a cover tape, which has an adhesive layer on the back face and has enough strength to be able to prevent extrusion of the plant root, is affixed to mutually abutting or overlapping resin film parts of the root-preventing layer to prevent extrusion of the plant root, and the thickness of the adhesive layer of the cover tape is formed to be smaller than the diameter of the extruding tip of the plant root.

Plant cultivation structure, root-preventing structure and root-preventing sheet used in them

A cleaning tape has a base tape made of a synthetic resin and a cleaning layer formed on a surface of this base tape. The cleaning layer has a binding agent and a large number of spherical particles dispersed in the binding agent in a single particle layer. Such a cleaning tape is capable of removing very small unwanted protrusions and particles on the surface of a target object such as a magnetic hard disk without forming scratches.

Cleaning tape and method of producing same

A blasting device for blasting steel pipe inner surface includes a tubular carrier fluid inflow unit connected to one end of a horizontal steel pipe, and a negative pressure suction unit connected to the other end of the steel pipe. A polishing material or a wiping material is injected horizontally into the carrier fluid inflow unit along with a carrier fluid from a hole formed in the edge face of the tubular carrier inflow unit. The device provides improved blast performance as well as the capability to blast the inner surface from beginning portion to an end portion to provide an excellent inner surface texture.

Blasting device for steel pipe inner surface, blasting method for steel pipe inner surface, and method for producing steel pipe with excellent inner surface texture

A material is provided to give food products sufficient viscosity and stability (heat resistance, stable suspension, etc.). The material is produced from an inexpensive raw material by an economical process. Further, a novel gel containing cellulose as the main component is also provided. The present invention provides a fine fibrous water-dispersible cellulose derived from plant cell walls. For the production, a raw material having specific properties is used, and size reduction is carried out stepwise thereto. The water-dispersible cellulose can also be made into a dry composition by compounding with a water-soluble polymer or the like. This dry composition forms a gel when combined with a polysaccharide such as glucomannan or the like. The gel excels in heat-resistance and shape-retention and can be used to produce to novel food products.

Water-dispersible cellulose and process for producing the same

A complex system where a plant group having a heat island phenomenon suppression effect and a solar cell having a carbon dioxide generation suppression effect are installed together. The purposes are to eliminate an adverse influence of both shadows of the plant group and the solar cell and to prevent the solar cell system from flying away by the wind pressure against the base side. The average height of the solar cell module is greater than that of the plant group. The plant group and the solar cell module are installed with a gap larger than the distance corresponding to the height difference between them. At least between the paired plant group and solar cell which face each other, an area for a person to walk through is provided. More than half of the ventilation area of the base side is covered with the plant group, a heat insulating material, and a moisture-retaining material.

Complex system of vegetation and solar cell

A fine-cellulose-containing complex comprising 60 to 80 wt % of fine cellulose, 2 to 12 wt % of locust bean gum, 0.5 to 8 wt % of xanthan gum and 0 to 37.5 wt % of a hydrophilic material(s), the complex being a powder wherein the average particle size of particles formed by mild dispersion of the complex in water at 85&#xb0; C. is 60 &#x3bc;m or less, the proportion of particles with a particle size of 100 &#x3bc;m or more among the formed particles is 30 vol % or less based on the total volume of the formed particles, and a colloid fraction in the case of vigorous dispersion of the complex in water at 25&#xb0; C. is 30% or less.

Composite containing fine cellulose

Growing community of inventors

Tokyo, Japan

Akihiro Sakamoto