US 12,123,082 B2
Non-oriented electrical steel sheet
Yukino Miyamoto, Tokyo (JP); Yoshiaki Zaizen, Tokyo (JP); and Yoshihiko Oda, Tokyo (JP)
Assigned to JFE STEEL CORPORATION, Tokyo (JP)
Appl. No. 17/594,382
Filed by JFE STEEL CORPORATION, Tokyo (JP)
PCT Filed Apr. 13, 2020, PCT No. PCT/JP2020/016346
§ 371(c)(1), (2) Date Oct. 14, 2021,
PCT Pub. No. WO2020/213576, PCT Pub. Date Oct. 22, 2020.
Claims priority of application No. 2019-078814 (JP), filed on Apr. 17, 2019.
Prior Publication US 2022/0195570 A1, Jun. 23, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. C22C 38/14 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/12 (2006.01)
CPC C22C 38/14 (2013.01) [C22C 38/002 (2013.01); C22C 38/008 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/12 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A non-oriented electrical steel sheet comprising an inner layer and surface layers provided on both sides of the inner layer,
each of the surface layers having a chemical composition containing, in mass %,
Si: 2.5% or more and 7.0% or less,
Mn: 0.50% or less, and
at least one selected from the group consisting of P: 0.010% or more and 0.100% or less, Sn: 0.001% or more and 0.10% or less, and Sb: 0.001% or more and 0.10% or less, with the balance being Fe and inevitable impurities,
the inner layer having a chemical composition containing, in mass %,
Si: 2.2% or more and 5.0% or less,
Mn: 0.01% or more and 0.50% or less, and
at least one selected from the group consisting of P: 0.010% or more and 0.100% or less, Sn: 0.001% or more and 0.10% or less, and Sb: 0.001% or more and 0.10% or less, with the balance being Fe and inevitable impurities,
wherein the non-oriented electrical steel sheet has:
a sheet thickness t of 0.01 mm or more and 0.35 mm or less;
a multilayer ratio of t1 to t represented by t1/t of 0.10 or more and 0.70 or less, where t1 denotes a total thickness of the surface layers;
a difference between [Si]1 and [Si]0 ([Si]1−[Si]0) represented by ΔSi of 1.0 mass % or more and 4.5 mass % or less, where [Si]1 denotes a Si content in each of the surface layers and [Si]0 denotes a Si content in the inner layer; and
a difference between [Mn]0 and [Mn]1 ([Mn]0−[Mn]1) represented by ΔMn of 0.01 mass % or more and 0.40 mass % or less, where [Mn]0 denotes a Mn content at a mid-thickness position t/2 and [Mn]1 denotes an average Mn content in a region from a surface of the non-oriented electrical steel sheet to a position at a depth of ( 1/10)t.