Jfe Steel Corporation

Shuji Kuyama

Tomoyoshi Ogasahara

Kazuya Asano

Katsuya Suzuki

Masamichi Kikuchi

Yoshitsugu Iijima

Tomoharu Ishida

Yoshie Nakai

Keisuke Mizobata

Aoto Miyazaki

A decarburization end point determination method includes: estimating the carbon concentration and oxygen concentration of the molten steel and carbon dioxide gas concentration of exhaust gas in the vacuum chamber by using measurement values of the carbon concentration and the oxygen concentration of the molten steel, a measurement value of internal pressure of the vacuum chamber, and a model formula; correcting a parameter included in the model formula to reduce at least one of a difference between an estimate value and a measurement value of the oxygen concentration and a difference between an estimate value and a measurement value of the carbon dioxide gas concentration of the exhaust gas; estimating the carbon concentration of the molten steel by using the model formula in which the parameter is corrected; and determining timing when an estimate value reaches a target value as the completion time point of the vacuum decarburization treatment.

Decarburization end point determination method, decarburization end point determination device, secondary refining operation method for steel making, and method for producing molten steel

A guidance device selects a safety factory operating at a time of a power failure, and presents a safety operation plan for a plurality of factories in a power system, and includes a presentation unit configured to calculate a combination of an operating factory and a non-operating factory within a predetermined period from a planned value of power demand-supply of the factories such that a power consumption amount of the factories satisfies a predetermined condition, and present information on the calculated combination.

Guidance device for selecting safety factory, guidance method for selecting safety factory, and method of operating factory

A material-property-value estimating method of estimating a material-property-value of a target steel-strip product manufactured via at least one of a reheating process, a rolling process, and a cooling process, which are performed while a target material is being conveyed along a conveyance route, the material-property-value estimating method includes an estimating step of estimating a material-property-value of each of meshes dividing the target steel-strip product based on a measured value that has been measured once or more by a measuring device installed on the conveyance route, the measured value including at least a temperature of the target material; and a chemical composition per component of the target steel-strip product.

Material property value estimating method, material property value estimating device, and steel-strip manufacturing method

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Tokyo, Japan

Shuji Kuyama