Non-oriented electrical steel sheet and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-9595376-B2
Application number	US-201514740440-A
Country	US
Kind code	B2
Filing date	Jun 16, 2015
Priority date	Jun 3, 2009
Publication date	Mar 14, 2017
Grant date	Mar 14, 2017

Abstract

A non-oriented electrical steel sheet comprising, Si: not less than 1.0 mass % nor more than 3.5 mass %, Al: not less than 0.1 mass % nor more than 3.0 mass %, Ti: not less than 0.001 mass % nor more than 0.01 mass %, Bi: not less than 0.001 mass % nor more than 0.01 mass %, wherein Expression (1) is satisfied when a Ti content (mass %) is represented as [Ti] and a Bi content (mass %) is represented as [Bi]: [Ti]≦0.8×[Bi]+0.002 . . . (1).

First claim

The invention claimed is:

1. A non-oriented electrical steel sheet, containing:
Si: not less than 1.0 mass % nor more than 3.5 mass %;
Al: not less than 0.1 mass % nor more than 3.0 mass %;
Mn: not less than 0.1 mass % nor more than 2.0 mass %;
Ti: not less than 0.001 mass % nor more than 0.01 mass %; and
Bi: not less than 0.001 mass % nor more than 0.01 mass %,
a C content being 0.01 mass % or less,
a P content being 0.1 mass % or less,
a S content being 0.005 mass % or less,
a N content being 0.005 mass % or less, and
a balance being composed of Fe and inevitable impurities, wherein:
a Ti content (mass %) is represented as [Ti] and a Bi content (mass %) is represented as [Bi], and Expression (1) below is satisfied:
[Ti]≦0.8×[Bi]+0.002  Expression (1),

wherein a number of TIN or TiS pieces having an equivalent spherical diameter of 0.01 μm to 0.05 μm is less than 1×10 8 per 1 mm 3 of the non-oriented electrical steel sheet.

2. The non-oriented electrical steel sheet according to claim 1 , wherein Expression (2) below is further satisfied:
[Ti]≦0.65×[Bi]+0.0015  Expression (2).

3. The non-oriented electrical steel sheet according to claim 1 , further containing at least one selected from the group consisting of Cu: 0.5 mass % or less and Cr: 20 mass % or less.

4. The non-oriented electrical steel sheet according to claim 1 , further containing at least one selected from the group consisting of Sn and Sb being 0.3 mass % or less in total.

5. The non-oriented electrical steel sheet according to claim 1 , further containing Ni: 1.0 mass % or less.

6. A non-oriented electrical steel sheet, containing:
Si: not less than 1.0 mass % nor more than 3.5 mass %;
Al: not less than 0.1 mass % nor more than 3.0 mass %;
Mn: not less than 0.1 mass % nor more than 2.0 mass %;
Ti: not less than 0.001 mass % nor more than 0.01 mass %;
Bi: not less than 0.001 mass % nor more than 0.01 mass %; and
at least one selected from a group consisting of REM and Ca,
a C content being 0.01 mass % or less,
a P content being 0.1 mass % or less,
a S content being 0.01 mass % or less,
a N content being 0.005 mass % or less, and
a balance being composed of Fe and inevitable impurities, wherein:
a Ti content (mass %) is represented as [Ti] and a Bi content (mass %) is represented as [Bi], and Expression (1) below is satisfied, and
the S content (mass %) is represented as [S], a REM content (mass %) is represented as [REM], and a Ca content (mass %) is represented as [Ca], and Expression (3) below is satisfied:
[Ti]≦0.8×[Bi]+0.002  Expression (1)

[S]−(0.23×[REM]+0.4×[Ca])≦0.005  Expression (3),

wherein a number of TiN or TiS pieces having an equivalent spherical diameter of 0.01 μm to 0.05 μm is less than 1×10 8 per 1 mm 3 of the non-oriented electrical steel sheet.

7. The non-oriented electrical steel sheet according to claim 6 , further containing at least one selected from the group consisting of Cu: 0.5 mass % or less and Cr: 20 mass % or less.

8. The non-oriented electrical steel sheet according to claim 6 , further containing at least one selected from the group consisting of Sn and Sb being 0.3 mass % or less in total.

9. The non-oriented electrical steel sheet according to claim 6 , further containing Ni: 1.0 mass % or less.

10. A non-oriented electrical steel sheet, consisting of;
Si: not less than 1.0 mass % nor more than 3.5 mass %;
Al: not less than 0.1 mass % nor more than 3.0 mass %;
Mn: not less than 0.1 mass % nor more than 2.0 mass %;
Ti: not less than 0.001 mass % nor more than 0.01 mass %;
Bi: not less than 0.001 mass % nor more than 0.01 mass %,
C: 0.01 mass % or less,
P: 0.1 mass % or less,
S: 0.005 mass % or less,
N: 0.005 mass % or less, and
a balance of Fe and inevitable impurities,

wherein the steel sheet satisfies Expression (1):
[Ti]≦0.8×[Bi]+0.002  Expression (1),

wherein [Ti] represents a Ti content (mass %), and [Bi] represents a Bi content (mass %),
wherein a number of TiN or TiS pieces having an equivalent spherical diameter of 0.01 μm to 0.05 μm is less than 1×10 8 per 1 mm 3 of the non-oriented electrical steel sheet.

Assignees

• Nippon Steel & Sumitomo Metal Corp

Inventors

• Miyazaki Masafumi
• Yamamura Hideaki
• Kubota Takeshi
• Kurosaki Yousuke
• Kawakami Kazuto
• Mizukami Kazumi
• Wakisaka Takeaki

Classifications

• C22C38/008

  containing tin · CPC title

• B22D11/00 Primary

  Continuous casting of metals, i.e. casting in indefinite lengths (metal drawing, metal extruding B21C) · CPC title

• C22C38/00

  Ferrous alloys, e.g. steel alloys (cast-iron alloys C22C37/00) · CPC title

• C22C38/002

  containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60 · CPC title

• C22C38/001

  containing N · CPC title