Abstract: A method for producing an ultra-low carbon steel product having a carbon concentration of 0.005% by mass or less includes, at least, a step of adjusting a carbon concentration of molten iron to obtain molten steel, a step of casting the molten steel into a slab, and a step of hot rolling the slab to obtain a hot-rolled steel sheet, in which the method further includes a width reduction step of performing width reduction on the slab with a reduction amount which is predetermined in accordance with the slab width in a direction orthogonal to the rolling direction of the slab.

Abstract: Provided is a semiconductor device capable of stably estimating an internal temperature of a battery. A semiconductor device coupled to a battery calculates entropy heat of the battery at a predetermined time by using a charging current of the battery and an internal temperature of the battery at a time before a predetermined time, calculates a heat generation amount of the battery from the charging current of the battery, calculates a heat radiation amount of the battery based on a temperature difference between the internal temperature at the time before the predetermined time and a surface temperature of the battery, and estimates an internal temperature of the battery at the predetermined time by using the entropy heat, the heat generation amount and the heat radiation amount.

Abstract: Provided are a steel-shape measurement device and a steel-shape correction device. The steel-shape measurement device measures a distance to a detection spot group on a to-be-scanned surface of a steel product with a laser rangefinder 5A that measures the distance through scanning of a steel product S with a laser beam emitted from one laser light source 11 and redirected with a galvanometer mirror 13, and measures a shape of the steel product from obtained measured-distance data. The steel-shape measurement device includes an object having a 45°-0° diffuse reflectance of equal to or lower than 10% as a laser-beam absorber 8 at least one portion within an irradiation range irradiated with a regular-reflected laser beam from a to-be-scanned surface of the steel product.

Abstract: A method for manufacturing a metal sheet comprising pinching the metal sheet in rapid quenching between a pair of pinch rolls in the range where the temperature of the metal sheet is from (TMs+150) (° C.) to (TMf?150) (° C.), wherein the Ms temperature of the metal sheet is TMs (° C.) and the Mf temperature thereof is TMf (° C.), as well as a rapid quenching unit comprising a pair of pinch rolls capable of use in such a method.

Abstract: A method of producing a galvannealed steel sheet includes: annealing a steel strip by conveying the steel strip through a heating zone including a direct fired furnace, a soaking zone, and a cooling zone in this order in an annealing furnace; hot-dip galvanizing the steel strip discharged from the cooling zone; and heat-alloying a galvanized coating formed on the steel strip. Mixed gas of humidified gas and dry gas is supplied into the soaking zone from at least one gas supply port located in a region of lower ½ of the soaking zone in a height direction so that a dew point measured in a region of upper ? of the soaking zone in the height direction and a dew point measured in a region of lower ? of the soaking zone in the height direction are both 20° C. or more and 0° C. or less.

Abstract: A method for manufacturing a hot-rolled steel sheet having a large thickness and a large width, a larger sheet width and a lower temperature can stably be cut at a cutting load equal to that of a conventional steel sheet having a usual sheet thickness, a usual sheet width and a usual temperature. In a rough rolling step, the steel sheet is formed so that the shortest length L (mm) from a concave portion bottom to a convex portion top of the fishtail shape satisfies Equation (1) mentioned below, and an intermediate portion between the concave portion bottom and the convex portion top, defined as a desired cutting location, is cut: (2X+30)?L?300??(1), in which X is a maximum deviation (mm) of the cutting location of a crop cutting machine and 0?X?90.

Abstract: Provided are a steel-shape measurement device and a steel-shape correction device. The steel-shape measurement device measures a distance to a detection spot group on a to-be-scanned surface of a steel product with a laser rangefinder 5A that measures the distance through scanning of a steel product S with a laser beam emitted from one laser light source 11 and redirected with a galvanometer mirror 13, and measures a shape of the steel product from obtained measured-distance data. The steel-shape measurement device includes an object having a 45°-0° diffuse reflectance of equal to or lower than 10% as a laser-beam absorber 8 at least one portion within an irradiation range irradiated with a regular-reflected laser beam from a to-be-scanned surface of the steel product.

Abstract: A method of producing a galvannealed steel sheet whereby favorable coating appearance can be obtained with high coating adhesion even in the case of galvannealing a steel strip whose Si content is 0.2 mass % or more, and a decrease in tensile strength can be prevented by lowering the alloying temperature. Mixed gas of humidified gas and dry gas, and dry gas are supplied to a soaking zone in an annealing furnace. The mixed gas is timely supplied from a position of lower half of the soaking zone. The dry gas is timely supplied from near an upper hearth roll in the soaking zone, and furnace gas is timely discharged from a gas discharge port located higher than the upper hearth roll, to control a dew point in at least an uppermost part of the soaking zone to ?20° C. or more and 0° C. or less.

Abstract: A method for manufacturing a metal sheet comprising pinching the metal sheet in rapid quenching between a pair of pinch rolls in the range where the temperature of the metal sheet is from (TMs+150) (° C.) to (TMf?150) (° C.), wherein the Ms temperature of the metal sheet is TMs (° C.) and the Mf temperature thereof is TMf (° C.), as well as a rapid quenching unit comprising a pair of pinch rolls capable of use in such a method.

Abstract: A method for manufacturing a hot-rolled steel sheet having a large thickness and a large width, a larger sheet width and a lower temperature can stably be cut at a cutting load equal to that of a conventional steel sheet having a usual sheet thickness, a usual sheet width and a usual temperature. In a rough rolling step, the steel sheet is formed so that the shortest length L (mm) from a concave portion bottom to a convex portion top of the fishtail shape satisfies Equation (1) mentioned below, and an intermediate portion between the concave portion bottom and the convex portion top, defined as a desired cutting location, is cut: (2X+30)?L?300??(1), in which X is a maximum deviation (mm) of the cutting location of a crop cutting machine and 0?X?90.

Abstract: A method of producing a galvannealed steel sheet includes: annealing a steel strip by conveying the steel strip through a heating zone including a direct fired furnace, a soaking zone, and a cooling zone in this order in an annealing furnace; hot-dip galvanizing the steel strip discharged from the cooling zone; and heat-alloying a galvanized coating formed on the steel strip. Mixed gas of humidified gas and dry gas is supplied into the soaking zone from at least one gas supply port located in a region of lower ½ of the soaking zone in a height direction so that a dew point measured in a region of upper ? of the soaking zone in the height direction and a dew point measured in a region of lower ? of the soaking zone in the height direction are both ?20° C. or more and 0° C. or less.

Abstract: Provided are a method for controlling a dew point in a reducing furnace and a reducing furnace in which, even in the case of galvanizing Si-added steel, coating adhesion can be secured, alloying treatment can be performed without increasing the alloying temperature excessively, and it is possible to obtain a hot-dip galvanized steel sheet having an excellent coating appearance. When a steel sheet is subjected to annealing and hot-dip galvanizing treatment using continuous hot-dip galvanizing equipment including at least a radiant tube-type reducing furnace, a mixed gas of a dry gas and a humidified gas by a humidifying device having a water vapor permeable membrane is used as a gas to be supplied into the reducing furnace. The mixed gas is supplied into the reducing furnace, thereby controlling the dew point in the reducing furnace.

Abstract: Making method of hot-rolled steel sheet comprises rough rolling a slab into a rough bar, heating the rough bar, guiding the rough bar with side guides and finish rolling the rough bar. The apparatus comprises a rough rolling mill, a heating device for heating the rough bar, side guides for guiding the rough bar and a finish rolling mill.