JFE Steel Patente

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A decarburization treatment end determination method includes a molten steel carbon concentration estimation step (S3, S4), and a decarburization treatment end determination step (S5). The molten steel carbon concentration estimation step divides the decarburization treatment into a plurality of stages, and estimates the carbon concentration using a different molten steel carbon concentration estimation model for each stage. The molten steel carbon concentration estimation model of a final stage expresses a decarburization reaction rate as a differential equation having a term proportional to the product of a linear expression of a carbon concentration in a portion of the molten steel placed in the reduced pressure environment Cv and a decarburization reaction capacity coefficient ak. The decarburization reaction capacity coefficient ak is calculated as a linear expression of the logarithm of a pressure P in a vacuum vessel.

A molten metal leakage detection device that can suppress erroneous detection of leakage of molten metal is provided. A molten metal leakage detection device is configured to detect leakage of molten metal from a molten metal handling facility. The molten metal leakage detection device includes an image taking unit configured to take images of the molten metal handling facility at predetermined time intervals to generate image data, a data acquisition unit configured to acquire time-series data of a number of pixels indicating a specific color included in a predetermined region of the image data, and a detection unit configured to detect, using the time-series data, that the molten metal leaks.

A wound iron core (10) is configured by winding a grain-oriented electrical steel sheet (11) in the rolling direction. In a cross-section parallel to the rolling direction at a bent portion of a corner (12) of the wound iron core (10), Kout is an average value of a KAM value in a region from a center of thickness of the grain-oriented electrical steel sheet (11) to an outer peripheral side of the wound iron core (10), Kin is an average value of the KAM value in a region from the center of thickness of the grain-oriented electrical steel sheet (11) to an inner peripheral side of the wound iron core (10), and KR defined as KR = Kin/Kout is 1.05 or more and 1.6 or less.

A light source for simulating molten metal leakage that allows easy simulation of molten metal leakage such as a breakout from a molten metal handling facility is provided.A light source for simulating molten metal leakage is used to simulate molten metal leakage from a molten metal handling facility and includes a light emitting unit that allows adjustment of coordinates of a color space of light to be emitted.

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A method of carbon dioxide separation and recovery that can separate and recover carbon dioxide with hydrogen sulfide and carbonyl sulfide removed from a feed gas containing carbon dioxide, hydrogen sulfide, and carbonyl sulfide. This method of carbon dioxide separation and recovery from a feed gas G01 containing carbon dioxide, hydrogen sulfide, and carbonyl sulfide by pressure swing adsorption includes a dehumidification process of removing moisture from the feed gas G01 to produce a dehumidified feed gas, and a carbon dioxide recovery process of separating and recovering carbon dioxide gas from the dehumidified feed gas by pressure swing adsorption. The method also includes a carbonyl sulfide hydrolysis process of reacting carbonyl sulfide with moisture to hydrolyze into hydrogen sulfide and carbon dioxide, and a desulfurization process of separating the hydrogen sulfide.

A wound iron core (10) is configured by winding a grain-oriented electrical steel sheet (11) in a rolling direction. A width of a shear region of the wound iron core (10) in a cross-section parallel to the rolling direction at a bent portion of a corner (12) of the wound iron core (10), within a region from a center of thickness of the grain-oriented electrical steel sheet (11) to an outer peripheral side of the wound iron core (10), is 100 µm or more and 400 µm or less.

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Objects of the present invention are to provide an electric resistance welded steel pipe having excellent weld quality and to provide a method for manufacturing the same. An electric resistance welded steel pipe including a base metal and an electric resistance weld, the base metal having a chemical composition containing, in mass%, C: 0.10 to 0.50%, Si: 0.15 to 0.35%, Mn: 0.60 to 0.90%, Al: 0.001 to 0.1%, P: 0.03% or less, S: 0.03% or less, Cr: 0.90 to 1.20%, Mo: 0.15 to 0.30%, and Ni: 0.25% or less, with the balance being Fe and unavoidable impurities, wherein the chemical composition has a Mn/(Si+Cr) of 0.52 or greater and 0.85 or less, and, in a flattening test of the electric resistance welded steel pipe, inequality (1), shown below, is satisfied: h / D ≤ 0.5 <img class="EMIRef" id="2f111e84-aa0f-49de-8f28-82cc50609fbc-ia01" /> where h is a flattening crack height (mm), at which an initial crack is observed in the electric resistance weld, and D is an outside diameter (mm) of the steel pipe.

The present invention provides a technology that improves productivity while inhibiting defects in forming a high-strength steel sheet. A method for manufacturing a press-formed product of the present invention is a method for manufacturing, by press forming a blank sheet, a press-formed product having a top portion that has an outer peripheral edge including a curved portion, a vertical wall continuous with the outer peripheral edge of the top portion, and a flange continuous with the vertical wall, the method being characterized in that a step of forming a curved vertical wall portion of the vertical wall continuous with the curved portion includes: a preforming step of forming a stepped curved vertical wall portion of which a lower vertical wall portion from a step provided at a predetermined position in a height direction of the curved vertical wall portion to the flange projects toward the flange relative to an upper vertical wall portion from the step to the top portion; and a main forming step of smoothing out the stepped curved vertical wall portion into a flat curved vertical wall portion using a die having a cam structure.

Provided is a surface-treatment solution for a galvanized steel sheet that has excellent storage stability and that can be used to produce a galvanized steel sheet with a surface-coating layer that has excellent long-term perspiration resistance and planar part anti-corrosion property. The surface-treatment solution for galvanized steel sheet includes a first surface-treatment solution (X) and a second surface-treatment solution (Y). The first surface-treatment solution (X) contains a silane coupling agent (A) having a glycidyl group, a tetraalkoxysilane (B), a zirconium carbonate compound (C), a sodium silicate (D1), a vanadium compound (E), a molybdic acid compound (F), and water, the contents of which satisfy defined relationships. The second surface-treatment solution (Y) contains a sodium silicate (D2), an anionic polyurethane resin (G), and water, the contents of which satisfy defined relationships.

A scale removal facility of the present invention is a steel sheet scale removal facility that removes a scale of a steel sheet to be conveyed, in which a first pickling device that performs first pickling on the steel sheet using a first acid liquid, a breaking device that mechanically breaks the scale, and a second pickling device that performs second pickling on the steel sheet using a second acid liquid are disposed in this order from an upstream side in a conveyance direction of the steel sheet.

The present invention relates to a welded joint of a floating offshore wind-power-generation equipment including a tower member, a float member, and a bracket. The present invention provides a welded joint exhibiting increased fatigue strength at a weld with weld beads extended onto the float member, and a method of manufacturing the same. A welded joint according to the present invention includes a first weld bead, a second weld bead, and a third weld bead. The first weld bead extends along one of short edges of a rectangular contact surface at which a bracket is in contact with a float member. The second weld bead and the third weld bead extend along two respective long edges of the rectangular contact surface and are each extended over a corresponding one of a starting end and a terminal end of the first weld bead onto the float member. Furthermore, it is preferable that a ratio M/N of an interval M between a distal end part of the second weld bead and a distal end part of the third weld bead and a length N of an extended portion of the second weld bead or the third weld bead be 2.0 or smaller.

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To collect a deposit under a belt of a belt conveyor provided with a mobile machine and move the deposit to the outside of rails. A cleaning device for cleaning up a deposit accumulated under the belt of the belt conveyor, the cleaning device including a collecting unit mounted on the mobile machine that travels on the rails provided along the conveying direction of the belt conveyor, which collects the deposit under the belt and moves the deposit to the outside of the rails.

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