Nippon Steel Patente

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A Ni-based alloy tube in which sufficient nitriding resistance is obtained in a high temperature ammonia environment is provided. A Ni-based alloy tube according to the present disclosure has a chemical composition described in the description, and a developed interfacial area ratio Sdr of an inner surface of the Ni-based alloy tube satisfies Formula (1): Cr / 2.0 + 0.8 × Fe + 6.0 × Ti × 1.5 + 10.0 × Sdr ≥ 0.9 <img class="EMIRef" id="07a4a998-29e4-4f6f-8cb6-58c6462850ce-ia01" /> where, a content of a corresponding element in percent by mass is substituted for each symbol of an element in Formula (1), and if an element is not contained, "0" is substituted for the symbol of the corresponding element.

Provided is an operation method of a blast furnace, in which a first reducing gas containing a hydrogen-based reducing gas as a main component is blown into the blast furnace, a second reducing gas, which is a gas recovered and separated from a top gas and contains at least 50% of a CO gas by volume fraction, is blown into the blast furnace, the second reducing gas is heated to a blowing temperature before the second reducing gas is blown into the blast furnace, and the blowing temperature of the second reducing gas is determined based on a gas volume of the first reducing gas blown into the blast furnace and a gas volume of the second reducing gas blown into the blast furnace.

A cutting apparatus for cutting a workpiece sandwiched in a first direction, wherein a first tool 110 and a second tool 120 are disposed in a first direction so as to face each other, a blade portion 110a of the first tool and a blade portion 120a of the second tool each include a pressing surface S1 perpendicular to the first direction and a first vertical wall surface S2 perpendicular to the pressing surface S1, at least any one of the blade portion 110a of the first tool and the blade portion 120a of the second tool includes a tool inclined surface S3 between the pressing surface S1 and the first vertical wall surface S2, an angle between the pressing surface S1 and the tool inclined surface S3 is an obtuse angle, and a clearance C [mm] between the first tool 110 and the second tool 120 and a distance d [mm] between the pressing surfaces S1 satisfy a formula (A) below: n<C/d<m where, n = 0.3 + (-0.15) × (1-cos4θ), m = 0.4, where, θ [°] is an inclination angle of the tool inclined surface S3 with respect to the first direction.

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[SUMMARY] [PROBLEM] To further improve punch-withdrawing performance while maintaining ironing formability during DI forming. [SOLUTION] A film-laminated steel sheet according to the present invention includes: a steel sheet serving as a base material; film layers formed by thermoplastic polyester films provided on front and rear surfaces of the steel sheet; and wax layers provided on the film layers, wherein a coating weight of the wax layer is within a range of 0.030 to 0.135 g/m<2> per side, the coating weights of the wax layers are different between the front surface and rear surface of the steel sheet, and a coating weight ratio, which is obtained by dividing the coating weight of the wax layer on a side with a higher coating weight by the coating weight of the wax layer on a side with a lower coating weight, is within a range of 1.05 to 1.35.

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Provided is a plated steel sheet comprising a base steel sheet and a plating layer formed on a surface of the base steel sheet, wherein the plating layer has a predetermined chemical composition, in a cross-section of the plating layer, an interfacial length L of the plating layer and the base steel sheet and a length L<0> of a surface of the base steel sheet satisfies (L-L<0> )/L<0> ×100≥3, and the plating layer comprises an Fe-Al phase and a thickness of the Fe-Al phase is 4 to 50 µm.

This prediction device includes a prediction unit in which the prediction unit is configured to calculate, based on respective contents of multiple components contained in a coating layer, a first proportion during a first period and a second proportion during a second period, for each phase constituting the coating layer, calculate, based on a corrosion order of the each phase, the first proportion of the each phase, and a first corrosion rate of the each phase, a duration of the first period until a part of corrosion of the coating layer reaches a base steel, calculate, based on a corrosion order of the each phase, the second proportion of the each phase, and a second corrosion rate of the each phase, a duration of the second period following the first period, and calculate a sum of the duration of the first period and the duration of the second period as a prediction result of corrosion resistance of the coating layer.

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A welded joint, in which a base metal has a specific chemical composition having α represented by the following formula of 5.0 to 16.0, a tensile strength of 615 MPa to 930 MPa, and a microstructure of a portion that is 1/4 of the thickness from the surface having a total area ratio of lower bainite and martensite of 15.0% or more, a total area ratio of upper bainite, the lower bainite, and the martensite of 90.0% or more, and an area ratio of retained austenite of less than 1.7%, and in which an effective crystal grain size in a region between a fusion line of a welded portion and a position 1 mm away from the fusion line in a heat-affected zone is 100.0 µm or less; and a pressure vessel comprising the welded joint. α = 0.50 × √[C] × (1 + 0.64[Si]) × (1 + 4.10[Mn]) × (1 + 0.27[Cu]) × (1 + 0.52[Ni]) × (1 + 2.33[Cr]) × (1 + 3.14[Mo])

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