Nippon Steel Sumitomo Metal Corporation

Nippon Steel Corporation

Makoto Atake

Tatsuhiko Sakai

Yoshiyuki Ushigami

Tesshu Murakawa

Masahiro Fujikura

Takeru Ichie

Shinichi Kanao

Kojiro Hori

Shinichi Matsui

Shinya Hayashi

Tsuyoshi Hamaya

Hiroaki Mochinaga

Shigenobu Koga

Takaharu Kataoka

Shinishi Kanao

A non-oriented electrical steel sheet containing: in mass%, C: 0.005% or less; Si: 0.1% to 2.0%; Mn: 0.05% to 0.6%; P: 0.100% or less; and Al: 0.5% or less, in which 10 pieces/&#x3bc;mor less in number density of non-magnetic precipitate AlN having an average diameter of 10 nm to 200 nm are contained, and an average magnetic flux density B50 in a rolling direction and in a direction perpendicular to rolling is 1.75 T or more. This non-oriented electrical steel sheet can be manufactured by two methods of a method of performing hot rolling annealing at a temperature of 750&#xb0; C. to an Actransformation point and a method of setting a coil winding temperature to 780&#xb0; C. or higher and performing self annealing.

Non-oriented electrical steel sheet

A non-oriented electrical steel sheet containing: in mass %, C: 0.005% or less; Si: 0.1% to 2.0%; Mn: 0.05% to 0.6%; P: 0.100% or less; and Al: 0.5% or less, in which 10 pieces/&#x3bc;mor less in number density of non-magnetic precipitate AlN having an average diameter of 10 nm to 200 nm are contained, and an average magnetic flux density B50 in a rolling direction and in a direction perpendicular to rolling is 1.75 T or more. This non-oriented electrical steel sheet can be manufactured by two methods of a method of performing hot rolling annealing at a temperature of 750&#xb0; C. to an Ac1 transformation point and a method of setting a coil winding temperature to 780&#xb0; C. or higher and performing self annealing.

Non-oriented electrical steel sheet and manufacturing method thereof

A value of a parameter Q represented by 'Q=([Ti]/48+[V]/51+[Zr]/91+[Nb]/93)/([C]/12)' is not less than 0.9 nor more than 1.1, when contents of Ti, V, Zr, Nb, and C (mass %) are represented as [Ti], [V], [Zr], [Nb], and [C] respectively. A matrix of a metal structure is a ferrite phase, and the metal structure does not contain a non-recrystallized structure. An average grain size of ferrite grains constituting the ferrite phase is not less than 30 &#x3bc;m nor more than 200 &#x3bc;m. A precipitate containing at least one selected from the group consisting of Ti, V, Zr, and Nb exists with a density of 1 particle/&#x3bc;mor more in the ferrite grain. An average grain size of the precipitate is not less than 0.002 &#x3bc;m nor more than 0.2 &#x3bc;m.

Non-oriented electrical steel sheet, manufacturing method thereof, laminate for motor iron core, and manufacturing method thereof

When contents of Ti, V, Zr, Nb, and C (mass %) are represented as [Ti], [V], [Zr], [Nb], and [C] respectively, a value of a parameter Q represented by 'Q=([Ti]/48+[V]/51+[Zr]/91+[Nb]/93)/([C]/12)' is not less than 0.9 nor more than 1.1. A matrix of a metal structure is a ferrite phase, and the metal structure does not include a non-recrystallized structure. An average grain size of ferrite grains constituting the ferrite phase is not less than 10 &#x3bc;m nor more than 200 &#x3bc;m. A precipitate containing at least one selected from the group consisting of Ti, V, Zr, and Nb exists with a density of 10 &#x3bc;mor more in the ferrite grain. An average grain size of the precipitate is not less than 0.002 &#x3bc;m nor more than 0.2 &#x3bc;m.

Non-oriented electrical steel sheet, method of manufacturing the same, laminate for motor iron core, and method of manufacturing the same

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Tokyo, Japan

Makoto Atake