Non-oriented electrical steel sheet and method of manufacturing non-oriented electrical steel sheet

Patent metadata

Field	Value
Publication number	US-9570219-B2
Application number	US-201314241543-A
Country	US
Kind code	B2
Filing date	Mar 27, 2013
Priority date	Mar 29, 2012
Publication date	Feb 14, 2017
Grant date	Feb 14, 2017

Abstract

This oriented electrical steel sheet is a non-oriented electrical steel sheet consisting of, in mass %: C: not less than 0.0001% and not more than 0.0040%, Si: more than 3.0% and not more than 3.7%, sol.Al: not less than 0.3% and not more than 1.0%, Mn: not less than 0.5% and not more than 1.5%, Sn: not less than 0.005% and not more than 0.1%, Ti: not less than 0.0001% and not more than 0.0030%, S: not less than 0.0001% and not more than 0.0020%, N: not less than 0.0001% and not more than 0.003%, Ni: not less than 0.001% and not more than 0.2%, P: not less than 0.005% and not more than 0.05%, with a balance consisting of Fe and impurities, in which a resistivity ρ at room temperature ≧60 μΩcm, and saturation magnetic flux density Bs at room temperature ≧1.945 T are established, and the components contained satisfy 3.5≦Si+(⅔)×sol.Al+(⅕)×Mn≦4.25.

First claim

The invention claimed is:

1. A method of manufacturing a non-oriented electrical steel sheet with components consisting of, in mass %:
C: not less than 0.0001% and not more than 0.0040%,
Si: not less than 3.2% and not more than 3.7%,
sol.Al: not less than 0.3% and not more than 1.0%,
Mn: not less than 0.5% and not more than 1.5%,
Sn: not less than 0.005% and not more than 0.1%,
Ti: not less than 0.0001% and not more than 0.0030%,
S: not less than 0.0001% and not more than 0.0020%,
N: not less than 0.0001% and not more than 0.003%,
Ni: not less than 0.001% and not more than 0.2%, and
P: not less than 0.005% and not more than 0.05%,
with a balance consisting of Fe and impurities, wherein
a resistivity ρ at room temperature ≧60 μΩcm, and saturation magnetic flux density Bs at room temperature ≧1.945 T are established, and
the components contained satisfy 3.5≦Si+(⅔)×sol.Al+(⅕)×Mn≦4.25, the method including:
hot-rolling a slab containing the components;
after the hot-rolling, applying hot-rolled-sheet annealing or self-annealing, or without applying the hot-rolled-sheet annealing, and applying pickling in either case;
applying cold-rolling only once, and
after the cold-rolling, applying final-annealing at 1000° C. or more, and applying coating,
wherein during the cold-rolling, the temperature of a steel sheet when the cold-rolling starts is set to not less than 50° C. and not more than 138° C., and a rate at which the steel sheet passes through a first pass during rolling is set to not less than 60 m/min and not more than 200 m/min.

2. The method according to claim 1 , wherein the non-oriented electrical steel sheet further satisfies sol.Al<Mn.

Assignees

• Nippon Steel & Sumitomo Metal Corp

Inventors

• Natori Yoshiaki
• Murakami Kenichi
• Wakisaka Takeaki
• Mogi Hisashi
• Matsumoto Takuya
• SHONO Tomoji
• Takase Tatsuya
• TAKAOBUSHI Junichi

Classifications

• H01F1/14791

  Fe-Si-Al based alloys, e.g. Sendust · CPC title

• H01F1/16

  in the form of sheets (H01F1/147 takes precedence) · CPC title

• C22C38/08

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

• C22C38/004 Primary

  Very low carbon steels, i.e. having a carbon content of less than 0,01% · CPC title

• C21D8/1233

  Cold rolling · CPC title