JFE Steel Patente

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A grinding system includes a shape measuring device configured to measure a three-dimensional shape and orientation of a material to be ground, a detection device configured to detect a position and shape of a grinding target portion that is present on a surface of the material to be ground, a grinding device (6) including a grinding tool, a movement mechanism configured to move the material to be ground relative to the shape measuring device and the grinding device, a grinding tool control unit (5) configured to generate a trajectory of the grinding tool for grinding the grinding target portion, and control the grinding device so that the grinding tool moves along the trajectory, and a movement mechanism control unit (12) configured to control the movement mechanism so that the material to be ground moves relative to the shape measuring device and the grinding device.

Provided is a foreign matter separation system and so on, each of which can automatically remove foreign matter contained in a scrap pile and reduce the amount of scrap to be removed together with the foreign matter in the scrap pile. A control device (30) of a foreign matter separation system (1) specifies positional information on foreign matter (D) in a scrap pile (SS) and specification information on the foreign matter (D) when the foreign matter (D) in the scrap pile (SS) is detected from a captured image (G) captured by an imaging device (10), determines a movement condition of the transport device (20) based on the specified positional information on the foreign matter (D), and determines a transport condition for transporting the foreign matter (D) using the transport device (20), based on the specified specification information on the foreign matter (D). The control device (30) controls the transport device (20) such that the transport device (20) moves under the movement condition of the transport device (20) and lifts and transports the foreign matter (D) that is placed to a foreign-matter loading area (52) under the transport condition for transporting the foreign matter (D) using the transport device (20).

Provided is a technology that enables scrap to be sorted, extracted, and transported to another location. A scrap transport device for selecting and transporting a scrap pile (1) containing a plurality of pieces of scrap (2) includes: an imaging device (3) configured to capture an image of the scrap pile (1); an image analysis unit (4) configured to estimate scrap information including sorting information for identifying the position of each detected scrap and characteristics of scrap (2) constituting the each detected scrap by analyzing the captured image taken by the imaging device (3), the each detected scrap being a collection of one or more pieces of scrap (2) present in each of one or more regions in the scrap pile (1); a selection computing unit (5) configured to select detected scrap that satisfies a predetermined selection condition by referring to the estimated sorting information; and a transfer device (6) configured to extract and transport scrap (2) from a region where the detected scrap selected by the selection computing unit (5) is present.

A foreign matter detection device (10) is a foreign matter detection device for detecting foreign matter contained in scrap and includes an image acquisition unit (131) configured to acquire an image captured by a camera that moves in accordance with an operation unit performing a predetermined operation on the scrap and captures an image of the surroundings of the operation unit, and a determination unit (132) configured to detect a foreign matter candidate based on the image and determine whether foreign matter is present based on the result of detecting the foreign matter candidate.

In an aspect, an electric resistance welded steel pipe with excellent corrosion resistance is provided. The electric resistance welded steel pipe includes a base metal material, and an electric resistance weld connecting one end portion of the base metal material and other end portion of the base metal material to each other. The base metal material and the electric resistance weld of the electric resistance welded steel pipe contain at least one of Cr, Mo, or Cu. Relationships between the concentrations of Cr, Mo, and Cu in the base metal material and the concentrations of Cr, Mo, and Cu in the electric resistance weld satisfy predetermined expressions. The electric resistance welded steel pipe and other aspects provided according to the present invention can realize excellent corrosion resistance.

A cold-rolled steel sheet containing a high carbon content of 0.80 mass% to 1.25 mass% that achieves both excellent machinability and blanking workability. The cold-rolled steel sheet has a defined chemical composition, and cementite particles having an area of 0.06 µm<2> or more have an average particle size of 0.65 µm or less, an A value is 2.0 mass% or more, a number density of voids having an area of 0.01 µm or more is 50,000/mm<2> or more, and a Vickers hardness is 200 HV or more and 400 HV or less.

A steel component that has excellent wear resistance and surface characteristics, and for which slab cracking does not occur during continuous casting. The steel component has a defined chemical composition. A number density of cementite particles having a particle size of 0.090 µm or more is 200,000/mm² or more, and a Cr amount in the cementite particles having a particle size of 0.090 µm or more is 2.5 mass% or more.

Stainless steel that has excellent oxidation resistance, resistance to Cr poisoning, and electrical conductivity not only in the operating environments of SOFCs but also in the operating environments of SOECs. The chemical composition is appropriately controlled, in particular, to Al: 0.60 mass% to 1.50 mass%, Nb: 0.20 mass% to 0.45 mass%, Cr: 20.0 mass% to 30.0 mass%, and Si: 0.05 mass% to 0.50 mass%, and the relationships of the following expressions (1) and (2) are satisfied: 0.03 × [Cr] + [Al] ≤ 2.20 ...(1), 0.44 × [Si] + [Al] ≤ 1.52 ...(2).

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The present invention proposes a method for producing manganese carbide that can reduce the CO<2> emissions. In this method, a reduction treatment of manganese ore is performed by heating the manganese ore to a treatment temperature corresponding to an unmelted state and bringing the manganese ore into contact with a mixed gas of hydrogen gas and hydrocarbon gas under atmospheric pressure. It is preferable that the partial pressure of the hydrocarbon gas in the mixed gas be set to 10.0 kPa or higher, and that the number of hydrogen atoms in the mixed gas be set to at least 12 times that of the carbon atoms. It is preferable that the treatment temperature be set to be within a range of 800°C or higher and lower than a melting temperature T<m>. It is preferable that the particle diameter of the manganese ore be adjusted to 3 mm or larger and 100 mm or smaller; that the treatment be performed in a rotary kiln; that the hydrocarbon gas be supplied at a position where the temperature inside the rotary kiln is 700°C or higher; etc. Also proposed is a method for producing manganese-containing steel that includes a step of adding the manganese carbide thus obtained to molten steel.

Provided is a method of producing a grain-oriented electrical steel sheet that can greatly improve manufacturability, and a production line that can realize this method. In the method of producing a grain-oriented electrical steel sheet, a steel slab having a defined chemical composition is hot-rolled, followed by hot-rolled sheet annealing, followed by cold rolling once or twice or more from a thickness of an obtained hot-rolled sheet to a thickness of a product for a total rolling reduction of 80 % or more, followed by primary recrystallization annealing, followed by application of an annealing separator to the steel sheet surface, followed by final annealing and flattening annealing for flattening. In this method, an occupancy rate of carbides relative to grain boundaries of recrystallized grains in the hot-rolled sheet after the hot-rolled sheet annealing, before cold rolling, is 80 % or more, and an initial rolling reduction in the cold rolling has a strain rate of 200/s or less, a rolling reduction of 30 % or less, and a steel sheet temperature at roll bite of 90 °C or lower.

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