Method for producing electrical steel sheet

Patent metadata

Field	Value
Publication number	US-12595525-B2
Application number	US-202118012830-A
Country	US
Kind code	B2
Filing date	Jun 23, 2021
Priority date	Jun 24, 2020
Publication date	Apr 7, 2026
Grant date	Apr 7, 2026

Abstract

A new and improved method for producing electrical steel sheet enabling production of electrical steel sheet excellent in magnetic characteristics and coating film adhesion, the method for producing electrical steel sheet containing a process of bringing an electrical steel sheet containing, by mass %, C: more than 0% and 0.10% or less, Si: 2.5% or more and 4.5% or less, Mn: 0.01% or more and 5.0% or less, a total of one or more of S, Se, and Te: more than 0% and 0.050% or less, acid soluble Al: more than 0% and 5.0% or less, N: more than 0% and 0.015% or less, and P: more than 0% and 1.0% or less and having a balance of Fe and impurities into contact with a solution, the solution containing one or more elements from among Cu, Hg, Ag, Pb, Cd, Co, Zn, and Ni, a total of concentrations of the elements being 0.00001% or more and 1.0000% or less.

First claim

The invention claimed is:

1 . A method for producing an electrical steel sheet comprising:
a pickling process of bringing the electrical steel sheet containing, by mass %, C: more than 0% and 0.10% or less, Si: 2.5% or more and 4.5% or less, Mn: 0.01% or more and 5.0% or less, a total of one or more of S, Se, and Te: more than 0% and 0.050% or less, acid soluble Al: more than 0% and 5.0% or less, N: more than 0% and 0.015% or less, and P: more than 0% and 1.0% or less and having a balance of Fe and impurities, wherein the electrical steel sheet optionally contains, in place of part of the Fe, one or more of Cu: 1.0% or less, Sn: 1.0% or less, Ni: 1.0% or less, Cr: 1.0% or less, Sb: 1.0% or less, and Bi: 1.0% or less, into contact with a liquid solution, the solution containing, by mass %, one or more of Cu, Hg, Ag, Pb, Cd, Co, Zn, and Ni, in a total concentration of 0.00001% or more and 1.0000% or less, a pH of the solution is −1.5 or more and less than 7, a solution temperature is 15° C. or more and 100° C. or less, and a time during which the electrical steel sheet contacts the solution is 5 seconds or more and 200 seconds or less, the electrical steel sheet contains MnS, MnSe, and MnTe before contact with the solution, and upon or after contact with the solution, Mn of one or more of the MnS, MnSe, and MnTe at surface layers of the electrical steel sheet is substituted by one or more of the Cu, Hg, Ag, Pb, Cd, Co, Zn, and Ni.

2 . The method for producing an electrical steel sheet according to claim 1 , wherein the pickling process for bringing the electrical steel sheet into contact with the solution is performed at or after a hot rolling process and before a finish annealing process.

3 . The method for producing an electrical steel sheet according to claim 1 , wherein the pickling process for bringing the electrical steel sheet into contact with the solution is performed at or after a finish annealing process and before an insulation coating process.

Assignees

• Nippon Steel Corp

Inventors

• Morishige Nobusato
• Mizukami Kazumi
• Itabashi Daisuke

Classifications

• C22C38/60

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

• C22C38/08

  containing nickel {(C22C38/105 takes precedence)} · CPC title

• C22C38/06

  containing aluminium · CPC title

• C22C38/04

  containing manganese · CPC title

• C22C38/02 Primary

  containing silicon · CPC title