Nippon Steel Corporation

Nippon Steel Sumitomo Metal Corporation

Nitto-denko Corporation

Jsr Corporation

Ricoh Company, Ltd.

Norihiro Yamamoto

Yoshiyuki Ushigami

Shuichi Nakamura

Kenichi Murakami

Norikazu Fujii

Hiroyasu Fujii

Fumiaki Takahashi

Shuichi Yamazaki

Minoru Maeda

Tomoji Kumano

Hisashi Mogi

Yasuyuki Tokunaga

Kazumi Mizukami

Hidetoshi Yamashita

Kentarou Kanae

Makoto Saitou

Takio Itou

Kiyoshi Sawano

Masahide Urago

Chie Hama

Masahide Uragoh

Hitoshi Yokouchi

Yoshifumi Ohata

Isao Iwanaga

A grain-oriented electrical steel sheet being a grain-oriented electrical steel sheet containing Si of 0.8 mass % to 7 mass %, Mn of 0.05 mass % to 1 mass %, B of 0.0005 mass % to 0.0080 mass %, each content of Al, C, N, S, and Se of 0.005 mass % or less, and a balance being composed of Fe and inevitable impurities and having a glass coating film made of composite oxide mainly composed of forsterite on the steel sheet surface, in which when glow discharge optical emission spectrometry (GDS) to the surface of a secondary coating film formed on the surface of the glass coating film under a predetermined condition is performed, a peak, of B, in emission intensity having a peak position in emission intensity different from a peak position, of Mg, in emission intensity is obtained and the peak position, of B, in emission intensity from the steel sheet surface is deeper than the peak position, of Mg, in emission intensity.

Grain-oriented electrical steel sheet and manufacturing method thereof

In a method of manufacturing a grain-oriented electrical steel sheet including a nitriding treatment (step S) and adopting so-called 'low-temperature slab heating', the finish temperature of finish rolling in hot rolling (step S) is set to 950&#xb0; C. or below, the cooling is started within 2 seconds after completion of the finish rolling, and a steel strip is coiled at 700&#xb0; C. or below. The cooling rate over the duration from the end of finish rolling to the start of coiling is set to 10&#xb0; C./sec or above. In annealing (step S) of the hot-rolled steel strip, the heating rate in the temperature range from 800&#xb0; C. to 1000&#xb0; C. is set to 5&#xb0; C./sec or above.

Method of manufacturing grain-oriented electrical steel sheet

A surface temperature of a slab is decreased down to 600&#xb0; C. or lower between start of continuous casting (step S) and start of slab reheating (step S). The surface temperature of the slab is held at 150&#xb0; C. or higher between the start of the continuous casting (step s) and the start of the slab reheating (step S). The surface temperature of the slab in the slab reheating (step S) is set to not lower than 1080&#xb0; C. and not higher than 1200&#xb0; C.

Method of treating steel for grain-oriented electrical steel sheet and method of manufacturing grain-oriented electrical steel sheet

An object of the invention is to provide a polyolefin resin foam which is excellent in flexibility, cushioning property and processability, especially excellent in cutting processability. The present invention relates to a polyolefin resin foam obtained by foaming a polyolefin resin composition using carbon dioxide in a supercritical state, wherein the polyolefin resin composition contains at least: (1) a thermoplastic elastomer composition obtained by subjecting to a dynamically heat treatment a mixture of (A) a rubber, and (B) (B-1) an &#x3b1;-olefin crystalline thermoplastic resin and/or (B-2) an &#x3b1;-olefin amorphous thermoplastic resin, each having a melt tension of less than 3.0 cN at a temperature of 210&#xb0; C. and at a take-up speed of 2.0 m/min, in the presence of (C) a crosslinking agent; (2) a polyolefin resin; and (3) a nucleant agent having an average particle diameter of from 0.1 &#x3bc;m to less than 2.0 &#x3bc;m. The polyolefin resin foam has a density, for example, of 0.2 g/cmor less.

Polyolefin resin foam and the process for producing the same

The present invention provides a method for producing a grain-oriented silicon steel sheet not having inorganic mineral films by using an annealing separator capable of preventing the inorganic mineral films composed of forsterite (Mg SiO ), and so on, from forming during final annealing, comprising the steps of decarburization annealing followed by coating of annealing separator and final annealing, wherein alumina powder calcined at a calcination temperature of 900 to 1,400&deg; C., or further having a BET specific surface area of 1 to 100 m /g, an oil absorption of 1 to 70 ml/100 g, and/or having a gamma ratio of 0.001 to 2.0, is used as the annealing separator. Magnesia having a BET specific surface area of 0.5 to 5 m /g may be added to said alumina powder.

Method for producing grain-oriented silicon steel sheet not having inorganic mineral film

Method to produce grain-oriented electrical steel sheet having high magnetic flux density

A method for producing a grain-oriented electrical steel sheet excellent in magnetic property, comprising the steps of; heating a slab containing a prescribed amount of Al to a temperature of 1,200&deg; C. or higher, hot-rolling the slab into a hot-rolled strip, annealing the strip as required, cold-rolling it once or twice or more with intermediate annealing(s), and decarburization annealing the cold rolled sheet, and final box annealing after the application of an annealing separator to prevent strip sticking during the annealing, characterized by heating the slab to a temperature (slab heating temperature Ts (&deg; C.)) higher than the complete solution temperature of substances having intensities as inhibitors and nitriding treating the decarburization annealed steel sheet before the commencement of secondary recrystallization during the final box annealing.

Method for producing a grain-oriented electrical steel sheet excellent in magnetic properties

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Tokyo, Japan

Norihiro Yamamoto