JFE Steel Patente

Provided are a zinc or zinc alloy coated or plated steel sheet having excellent delayed fracture resistance in stretch flanged areas, and a method of producing same. The zinc or zinc alloy coated or plated steel sheet includes a base steel sheet and a zinc or zinc alloy coated or plated layer formed on the surface of the base steel sheet. The base steel sheet has a defined chemical composition. The base steel sheet has a defined microstructure at a 1/4 sheet thickness position. A thickness of a carbon concentration reduced portion in the surface layer of the base steel sheet is 1.0 µm or more and 150.0 µm or less. A thickness of a bainite precipitation region directly below the carbon concentration reduced portion is 10 µm or more. A total coverage of retained austenite and fresh martensite at prior austenite grain boundaries directly below the carbon concentration reduced portion is 30.0 % or more and 60.0 % or less. A carbon concentration of retained austenite covering the prior austenite grain boundaries is less than 0.60 mass%. The tensile strength is 1470 MPa or more.

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Provided is a shaped refractory used in an electric furnace for producing molten iron by melting an iron-containing raw material containing iron, the shaped refractory having excellent erosion resistance. The shaped refractory contains at least one selected from the group consisting of aluminum oxide, silicon carbide, and carbon, and the content of magnesium oxide is not more than 10 mass%. The apparent porosity of the shaped refractory is preferably not more than 10 vol%. The content of the aluminum oxide of the shaped refractory is preferably not less than 70 mass%. The shaped refractory is preferably electrocast brick. The iron-containing raw material is preferably reduced iron obtained by a direct reduction ironmaking method. The electric furnace is preferably a submerged arc furnace.

A logistics simulator device includes an input information acquisition module (301), a controller module (309) that executes simulations, a route module (310) that searches for transportable routes, and a simulation result output module (311) that outputs an inventory trends and job results acquired at discrete time intervals. The logistics simulator device includes, as optional components each provided with on/off control, an incoming port module (302), an incoming lot inventory management module (303), a processing material inventory site module (304), an inventory management module for processing material inventory sites (305), a processing equipment inventory site module (306), a processing equipment bin-type inventory site module (307), and a processing equipment module (308).

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A steel sheet is provided that has a tensile strength of 780 MPa or more, high ductility, excellent stretch flange formability, and excellent energy absorption properties at the time of crash. A related member and related manufacturing methods are also provided. The steel sheet has a chemical composition including specific amounts of C, Si, Mn, P, S, sol. Al, and N; includes steel microstructures including, in terms of area fraction, ferrite and bainitic ferrite in total: 5 to 60%, tempered martensite: 20 to 80%, fresh martensite: 20% or less (including 0%), and retained austenite: 5 to 25%, and containing 90% or more (including 100%) of one, or two or more of ferrite, tempered martensite, fresh martensite, bainite, and retained austenite; and satisfies that ferrite includes 20% or more and 70% or less of high-Mn ferrite in terms of area fraction, and (S<C≥0.5>/S<C≥0.3>) × 100 is 20% or more.

Provided is a grain-oriented electrical steel sheet having magnetic properties that can sufficiently control the building factor. The grain-oriented electrical steel sheet includes a base film and an insulating coating in this order on the surface of a base steel sheet containing at least La: 0.0001 % to 0.0200 %, wherein Ti content in the steel sheet is 0.0050 % to 0.1500 %, and a ratio R17 of Wh<17> to W<17/50> and a ratio R18 of Wh<18> to W<18/50> satisfy R18/R17 ≤ 1.50.

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There is provided a slab continuous-casting method that is capable of improving productivity of a slab having a thickness larger than that of conventional slab and that is capable of ensuring surface quality of the slabs by suppressing surface cracks in the slabs.In a slab continuous-casting method using a continuous casting machine that includes a mold 6, a vertical section 8 disposed downstream of the mold 6 in a moving direction of a slab 7 withdrawn from the mold 6, a bending section 10 disposed downstream of the vertical section 8 in the moving direction, and a horizontal section 11 disposed downstream of the bending section 10 in the moving direction, the surface temperature of the slab 7 at the exit side of the vertical section 8 is 700°C or higher and 1200°C or lower, and a first cooling density X calculated from an amount of cooling water in the bending section 10 is less than or equal to a second cooling density Y calculated from an amount of cooling water in the horizontal section 11.

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Provided is a grain-oriented electrical steel sheet that can sufficiently control the building factor when used as an iron core material for a transformer. The grain-oriented electrical steel sheet includes a base steel sheet containing at least W: 0.0010 % to 0.0500 %, and a base film. Ti content of the steel sheet as a whole is 0.0050 % to 0.0200 %, and a ratio R17 of Wh<17> to W<17/50> and a ratio R19 of Wh<19> to W<19/50> satisfy R19/R17 ≤ 1.30.

Provided is a grain-oriented electrical steel sheet that can sufficiently control the building factor when used as an iron core material for a transformer. The grain-oriented electrical steel sheet includes a base steel sheet containing at least Ga: 0.0001 % to 0.0050 %, and a base film. Ti content of the grain-oriented electrical steel sheet is 0.0050 % to 0.0210 %, and a ratio R17 of Wh<17> to W<17/50> and a ratio R19 of Wh<19> to W<19/50> satisfy R17 ≤ R19 ≤ 0.70.

A high-pressure tank is provided that ensures sufficient storage capacity for hydrogen-containing gas while reducing weight. The high-pressure tank includes a tank body configured to store therein a mixed gas containing natural gas and hydrogen, the mixed gas containing more than 2% hydrogen by volume. The tank body includes a cylindrical portion extending in a first direction and dome portions respectively provided at both ends of the cylindrical portion in the first direction. A steel material constituting the tank body has a tensile strength of 850 MPa or more, a structure in which tempered martensite accounts for 95% or more in terms of area fraction, and carbides having a size of 100 nm or less dispersed in a metallic microstructure as precipitates, and has strength of 11,250 cycles or more in crack propagation analysis.

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