Grain oriented electrical steel sheet and production method therefor

Patent metadata

Field	Value
Publication number	US-2016333435-A1
Application number	US-201515112476-A
Country	US
Kind code	A1
Filing date	Jan 8, 2015
Priority date	Jan 23, 2014
Publication date	Nov 17, 2016
Grant date	—

Abstract

A magnetic domain refining treatment is performed by dividing a surface of a steel sheet into a plurality of regions in a widthwise direction, disposing a laser irradiation apparatus or an electron beam irradiation apparatus in each of the regions, and forming beam-irradiated regions through beam irradiation, wherein beams are irradiated so that a nature of a juncture between beam-irradiated regions satisfies 0≦α≦0.3×a and −1.2×a+0.02×w−0.5×α−6.5≦β≦−0.13×a−200×(1/w)+5.4 when TD spacing β at the juncture between the beam-irradiated regions is −3 to 0 mm, whereby a grain oriented electrical steel sheet having an excellent iron loss property is produced in a good productivity.

First claim

1 .- 2 . (canceled)

3 . A grain oriented electrical steel sheet having a plurality of beam-irradiated regions formed by performing laser irradiation or electron beam irradiation onto a steel sheet surface in a widthwise direction of the steel sheet to introduce continued strain in a linear shape or in a dot sequence shape at an angle of not more than 30° with respect to the widthwise direction thereinto, wherein a juncture between the beam-irradiated regions satisfies equations (1) and (2):
0≦ a≦ 0.3× a   (1)

−1.2× a+ 0.02× w− 0.5× a− 6.5≦β≦−0.13× a− 200×(1/ w )+5.4  (2)

wherein
α: RD spacing (mm) at a juncture between beam-irradiated regions,
β: TD spacing (mm) at a juncture between beam-irradiated regions,
a: beam spacing (mm), and
w: average width of magnetic domain discontinuous part (μm).

4 . The method as claimed in claim 3 , wherein a surface of the steel sheet is divided into plural regions in a widthwise direction of the sheet and subjected to a magnetic domain refining treatment by disposing a laser irradiation apparatus or an electron beam irradiation apparatus on each of the regions and irradiating beams to form a beam-irradiated region, and irradiation of beams is performed by setting a TD spacing β at a juncture between the beam-irradiated regions to −3 to 0 mm.

Assignees

• Jfe Steel Corp

Inventors

• Inoue Hirotaka
• Takajo Shigehiro
• Okabe Seiji

Classifications

• B23K2103/04

  Steel {or steel} alloys · CPC title

• C22C38/008

  containing tin · CPC title

• C22C38/60

  containing lead, selenium, tellurium, or antimony, or more than 0.04% by weight of sulfur · CPC title

• B23K26/0006

  taking account of the properties of the material involved (B23K26/32, B23K26/40 take precedence) · CPC title

• C22C38/44

  with molybdenum or tungsten · CPC title