公开(公告)号：US20200086619A1

公开(公告)日：2020-03-19

申请号：US16471774

申请日：2017-12-11

Applicant: JFE STEEL CORPORATION

Inventor： Nobuko NAKAGAWA ,  Naoki MURAMATSU ,  Chiyoko TADA

IPC: B32B37/12 ,  B32B15/01 ,  B32B7/12 ,  H02K15/02 ,  B23P19/04

Abstract: Provided is a method of manufacturing an electrical steel sheet with an adhesive insulating coating that has excellent high-temperature adhesive property and high-temperature oil resistance and, even after being stacked and subjected to stress relief annealing, has excellent magnetic properties (iron loss, magnetic flux density). The method comprises: applying a coating material to at least one side of an electrical steel sheet, the coating material containing (a) an aqueous epoxy resin, (b) a high-temperature hardening crosslinking agent in an amount of 30 parts by mass or less with respect to 100 parts by mass of the aqueous epoxy resin, in terms of solid content, (c) metal oxide particles, and (d) a solvent; and baking the coating material applied to the electrical steel sheet, under a condition of a peak steel sheet temperature of 150° C. or more and less than 230° C.

公开(公告)号：US20180251869A1

公开(公告)日：2018-09-06

申请号：US15562994

申请日：2016-04-05

Applicant: JFE STEEL CORPORATION

Inventor： Naoki MURAMATSU ,  Nobuko NAKAGAWA ,  Kazumichi SASHI ,  Chiyoko TADA

IPC: C21D8/12 ,  C23C22/68 ,  C09D5/08 ,  B05D3/02

Abstract: The disclosure provides an electrical steel sheet with an insulating coating excellent in both punchability and powdering resistance, without any chromium compound being contained in the insulating coating. The electrical steel sheet with an insulating coating includes an electrical steel sheet and an insulating coating formed on the electrical steel sheet. The insulating coating contains Si and particulate organic resin. The organic resin contains primary particles having an average primary particle size of 1.0 μm or less, and 5% or more and 50% or less of the primary particles of the organic resin are agglomerated particles.