Non-oriented electrical steel sheet and method of manufacturing stacked core using same

Patent metadata

Field	Value
Publication number	US-11795518-B2
Application number	US-201917257466-A
Country	US
Kind code	B2
Filing date	Oct 24, 2019
Priority date	Oct 24, 2018
Publication date	Oct 24, 2023
Grant date	Oct 24, 2023

Abstract

Provided are a non-oriented electrical steel sheet with which it is possible to improve steel sheet transferability even when punching is performed successively at high speed, and a method of manufacturing a stacked core using the same. The non-oriented electrical steel sheet contains, by mass percent, Si: 2.0 to 5.0%, Mn: 0.4 to 5.0%, Al≤3.0%, C: 0.0008 to 0.0100%, N≤0.0030%, S≤0.0030%, and Ti≤0.0060%, wherein the product of the contents of Mn and C is 0.004 to 0.05 mass % 2 , the yield strength in rolling direction is more than or equal to 600 MPa, and the Young's modulus is more than or equal to 200 GPa. In the method of manufacturing a stacked core, when manufacturing a stacked core using a progressive die, the steel sheet transfer speed V (m/s) satisfies expression (1). V: V MIN to V MAX (1) V MAX =( 1/25)√(t 2 ×E×YS) (2) V MIN =( 1/25)√(t 2 ×120000) (3) t: Steel sheet thickness (mm), E: Young's ratio (GPa), YS: Yield strength (MPa).

First claim

The invention claimed is:

1. A non-oriented electrical steel sheet comprising, by mass %:
Si: 7.0 to 5.0%,
Mn: 0.4 to 5.0%,
0.1≤Al≤3.0%,
C: 0.0008 to 0.0100%,
N≤0.0030%,
S≤0.0030%,
Ti≤0.0060%,
a balance of Fe and unavoidable impurities,

wherein:
a product of the contents of Mn and C is in a range of 0.004 to 0.05 (mass %) 2 , and
the steel sheet has a yield strength in a rolling direction of 600 MPa, or more, and a Young's modulus in the rolling direction of 200 GPa or more.

2. The non-oriented electrical steel sheet according to claim 1 , wherein the electrical steel further comprises, by mass %, 0.001 to 0.50% of one or more of Ni, Cr, Mo, Sn and Sb in total.

Assignees

• Nippon Steel Corp

Inventors

• Fujimura Hiroshi
• Kano Satoshi
• Tomita Miho

Classifications

• Y02P10/20

  Recycling · CPC title

• C21D8/12 Primary

  during manufacturing of articles with special electromagnetic properties · CPC title

• B21D28/02

  Punching blanks or articles with or without obtaining scrap (cutting nails or pins from strips or sheet material B21G3/26); Notching · CPC title

• C21D8/0263

  following hot rolling · CPC title

• C21D9/0012

  Rolls; Roll arrangements · CPC title