Nippon Steel Corporation

Nippon Steel Sumitomo Metal Corporation

Yasumitsu Kondo

Shuichi Yamazaki

Masato Sugiura

Shuichi Nakamura

Yasuyoshi Hidaka

Hiroshi Tanei

Yuji Kubo

Takehide Senuma

Yoshiaki Hirota

Hotaka Honma

Maremizu Ishibashi

Aya Fujita

Masayoshi Minakuchi

Seiji Miyamoto

Takayoshi Kagari

Hotaka Homma

Katsuyuki Yanagihara

Wataru Nohara

Kosuke Hayashi

A scale composition determination device () determines that FeOhas been generated in the outermost layer of a scale (SC) in the case where at least one of spectral emissivities at one wavelength and the other wavelength that are measured by radiometers for spectral emissivity measurement () is not within a predetermined range including spectral emissivities of FeO at one wavelength and the other wavelength, and determines that FeOhas not been generated in the outermost layer of the scale (SC) in the case where all of the spectral emissivities at one wavelength and the other wavelength that are measured by the radiometers for spectral emissivity measurement () is within the predetermined range including the spectral emissivities of FeO at one wavelength and the other wavelength.

Scale composition determination system, scale composition determination method, and program

A scale composition determination device () determines that FeOhas been generated in the outermost layer of a scale (SC) in the case where the absolute value of a difference between temperatures of a steel material SM measured by radiation thermometers () is equal to or more than a predetermined temperature, and determines that FeOhas not been generated in the outermost layer of the scale (SC) in the case where the absolute value of the difference between the temperatures of the steel material SM measured by the radiation thermometers () is not equal to or more than the predetermined temperature.

The present invention: relates to a grain-oriented electrical steel sheet and a double-oriented electrical steel sheet which are used as soft magnetic materials for electrical machinery and apparatus; and is a grain-oriented electrical steel sheet extremely excellent in film adhesiveness, characterized by: containing, in mass, 2.5 to 4.5% Si, 0.01 to 0.4% Ti, and not more than 0.005% as to each of C, N, S and O, with the balance substantially consisting of Fe and unavoidable impurities; and having films comprising compounds of C with Ti or Ti and one or more of Nb, Ta, V, Hf, Zr, Mo, Cr and W on the surfaces of said steel sheet, and a method for producing the steel sheet.

Grain-oriented electrical steel sheet extremely excellent in film adhesiveness and method for producing the same

A slab for an electrical steel sheet is heated at a temperature of 1280.degree. C. or below and then hot-rolled. The hot-rolled steel sheet or hot rolled and annealed steel sheet is then cold-rolled once or at least twice with intermediate annealing being performed between rollings. The cold-rolled sheet is decarburized and nitrided to form an inhibitor. The amount of nitrogen of in the steel sheet during the nitriding treatment subsequent to the decarburization annealing and the iron loss value after the withdrawal of the steel sheet from the furnace are measured to estimate the average diameter of a primary recrystallized grain, and next decarburization annealing is performed under conditions regulated in such a manner that the average diameter of the primary recrystallized grain of a product sheet falls within a proper range. The steel sheet subjected to the decarburization annealing is coated with an annealing separator composed mainly of MgO and then subjected to finish annealing.

Process for production of oriented electrical steel sheet having

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Tokyo, Japan

Yasumitsu Kondo