Nippon Steel Corporation

Nippon Steel Sumitomo Metal Corporation

Sony Corporation

Takahide Shimazu

Yousuke Kurosaki

Takeshi Kubota

Shuichi Yamazaki

Masahiro Fujikura

Morio Shiozaki

Yasuo Sato

Takeshi Harada

Masafumi Miyazaki

Hisashi Mogi

Takeaki Wakisaka

Hiroaki Kato

Kenji Kosuge

Teruo Takeuchi

Hotaka Honma

Ryoichi Yoshihara

Masafumi Okamoto

Kiyoshi Tanaka

Keisuke Fukumizu

Masahiko Oda

Kazuo Ohnuki

Takayoshi Inokuchi

Kazuo Nishiura

Tatsuo Amaike

A manufacturing method of a non-oriented electrical steel sheet includes: performing finish annealing of a cold-rolled steel strip; and forming a tension-applying type insulating film of not less than 1 g/mand not more than 6 g/mon a surface of the cold-rolled steel strip. The performing the finish annealing includes forming an oxide layer containing AlOor (Al, Cr)Oand having a thickness of not less than 0.01 &#x3bc;m and not more than 0.5 &#x3bc;m on the surface of the cold-rolled steel strip with setting a temperature of the cold-rolled steel strip to not lower than 800&#xb0; C. and not higher than 1100&#xb0; C. in an atmosphere where when the total content of Si and Al of the cold-rolled steel strip is represented as X (mass %), a partial pressure ratio of water vapor to hydrogen is equal to or less than 0.005&#xd7;X.

Non-oriented electrical steel sheet and manufacturing method thereof

A non-oriented electrical steel sheet includes: a base iron (); and a tension applying type insulating film () of not less than 1 g/mnor more than 6 g/mon a surface of the base iron (). An oxide layer () containing at least one type of oxide selected from the group consisting of Si, Al, and Cr and having a thickness of not less than 0.01 &#x3bc;m nor more than 0.5 &#x3bc;m is formed on the surface of the base iron ().

A non-oriented electrical steel sheet contains Cr: 0.3 mass % to 5.3 mass %, Si: 1.5 mass % to 4 mass %, Al: 0.4 mass % to 3 mass %, and W: 0.0003 mass % to 0.01 mass %. A C content is 0.006 mass % or less, a Mn content is 1.5 mass % or less, a S content is 0.003 mass % or less, and a N content is 0.003 mass % or less, and the balance is composed of Fe and inevitable impurities.

Non-oriented electrical steel sheet

There is produced a molten steel containing, in mass %, Si: not less than 0.1% nor more than 7.0%, Mn: 0.1% or more, Al: not less than 0.2% nor more than 5.0%, Cr: not less than 0.1% nor more than 10%, and the like, and a balance composed of Fe and inevitable impurities. To the molten steel, REM: not less than 0.0005% nor more than 0.03% is added. The molten steel to which REM has been added is casted. A cast slab of non-oriented electrical steel is manufactured as above.

Cast slab of non-oriented electrical steel and manufacturing method thereof

A 0.1 to 0.5 mm-thick plated steel sheet having high coercive force and magnetic flux density is provided by hot rolling a slab comprising by weight carbon: 0.01 to 0.09%, silicon: not more than 1.0%, phosphorus: not more than 0.3%, manganese: not more than 1.5%, sulfur: not more than 0.04%, aluminum: not more than 1.0%, and nitrogen: not more than 0.01% with the balance consisting of iron and unavoidable impurities, cold rolling the hot rolled sheet, annealing the cold rolled sheet to prepare a steel sheet having an average grain diameter of 3 to 15 .mu.m, temper rolling the steel sheet with a reduction ratio of not more than 3%, and plating the temper rolled sheet with chromium or nickel. This enables the provision of a magnetic shielding material having no significant drift and very good electron beam landing properties.

Magnetic shielding material for television cathode-ray tube and process

An inner shielding material and a method of manufacturing the same, wherein the material comprises a steel sheet 0.10 to 0.25 mm thick of a composition of .ltoreq.0.005% C, .ltoreq.2.0% Si, .ltoreq.0.4% P, 0.1 to 1.0% Mn, 0.01% S, .ltoreq.0.01% sol.Al, .ltoreq.0.01% N and the balance Fe and residual impurities, having a hardness H.sub.v (500 g) of 90 or greater and a grain size of 7 or less when measured by ferrite grain size; and a blackened layer on the surface of the steel sheet comprising primarily FeO formed by transformation of Fe.sub.3 O.sub.4 and having superior adhesion.

Television picture tube inner shielding material having a blackened

A method for preventing edge cracks in a grain oriented silicon steel sheet produced from a continuously cast slab containing 2.5 to 4.0% silicon. This method is carried out with a controlled reduction rate in a rough rolling mill and/or with an adjusted reduction by a pair of edge rolls of an edger.

Method for preventing the edge crack in a grain oriented silicon steel

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Tokyo, Japan

Takahide Shimazu