公开(公告)号：US20240286219A1

公开(公告)日：2024-08-29

申请号：US18571267

申请日：2022-04-28

Applicant: NIPPON STEEL CORPORATION

Inventor： Yoshihiro YAMADA ,  Takeshi IMAI ,  Dairi YAJIMA ,  Hideyuki HAMAMURA ,  Yoshiaki HIROTA

IPC: B23K26/16 ,  B23K26/08 ,  B23K26/14 ,  B23K26/364 ,  B23K103/04

CPC classification number: B23K26/16 ,  B23K26/083 ,  B23K26/1464 ,  B23K26/364 ,  B23K2103/04

Abstract: A laser processing device includes: a laser light source unit that irradiates, with laser light, a surface of a steel sheet conveyed in a predetermined conveyance direction; a first nozzle that injects gas toward an irradiation site of the laser light, parallel to an optical axis direction of the laser light; and a dust collection mechanism unit that is provided only at one of an upstream side or a downstream side of the irradiation site, in the conveyance direction, and that collects, from a dust collection port, laser sputter generated from the irradiation site.

公开(公告)号：US20220090226A1

公开(公告)日：2022-03-24

申请号：US17421766

申请日：2020-01-16

Applicant: NIPPON STEEL CORPORATION

Inventor： Takeshi IMAI ,  Shunsuke OKUMURA

IPC: C21D9/46 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/12 ,  C21D8/00 ,  C21D6/00 ,  C21D3/04 ,  C21D1/26 ,  H01F1/147

Abstract: A method for producing a grain-oriented electrical steel sheet which has an intermediate layer containing silicon oxide as a main component on a surface of a base steel sheet in which a forsterite film is substantially absent and has an insulation coating on a surface of the intermediate layer includes: a decarburization annealing process of obtaining a decarburization-annealed steel sheet which has the oxygen content or 320 ppm or less and the carbon content of 25 ppm or less by subjecting a cold rolled steel sheet containing Si to decarburization annealing; a final annealing process of heating the decarburization-annealed steel sheet in a state in which a surface of the decarburization-annealed steel sheet is coated with an annealing separator to subject a steel sheet to secondary recrystallization; a removal process of obtaining a finally-annealed steel sheet by removing the annealing separator on the steel sheet which has been subjected to the final annealing process; an intermediate layer forming process of forming the intermediate layer by subjecting the finally-annealed steel sheet to thermal oxidation annealing; and an insulation coating forming process of forming the insulation coating on the finally-annealed steel sheet having the intermediate layer formed thereon.

公开(公告)号：US20220025498A1

公开(公告)日：2022-01-27

申请号：US17296897

申请日：2019-11-29

Applicant: NIPPON STEEL CORPORATION

Inventor： Yuki SUZUKI ,  Soshi FUJITA ,  Masahiro FUDA ,  Hideaki IRIKAWA ,  Takeshi IMAI ,  Fumio EIHARA

IPC: C22C38/58 ,  C22C38/02 ,  C22C38/06 ,  C22C38/54 ,  C22C38/42 ,  C22C38/50 ,  C22C38/48 ,  C22C38/00 ,  C25D1/04 ,  B21D22/02

Abstract: This aluminum-plated steel sheet has a steel sheet and a plating layer formed on a surface of the steel sheet, the plating layer contains one or more A group elements selected from a group consisting of Be, Mg, Ca, Sr, Ba, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, and Zn, a remainder of Al, Fe, and impurities, a thickness t of the plating layer is 10 to 60 μm, and an average grain size is 2t/3 or less and 15 μm or less in a thickness range from an outermost surface of the plating layer to a ⅔ thickness t position.