Patent US4698272A successfully refreshed from Google Patents.
US4698272A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extra-low iron loss grain oriented silicon steel sheets
Assignee: JFE Steel Corp
•
Filing: 1986-02-21
•
Granted: 1987-10-06
•
Expires: 2006-02-21
Abstract
Abstract An extra-low iron loss grain oriented silicon steel sheet comprises a base metal of silicon steel and a thin coat of nitride or carbide of Ti, Zr, Hf, V, Nb, Ta, Mn, Cr, Mo, W, Co, Ni, Al, B and Si and strongly adhered to a finished surface of the base metal through a mixed layer of the base metal and the thin coat, and has excellent electrical and magnetic properties as well as good compressive stress dependence of magnetostriction and lamination factor.
Inventors
- 👤 Yukio Inokuti
- 👤 Yo Ito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:44
CPC Classifications
H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/147; H01F1/14766; H01F1/14775; H01F1/14783; C; C21; C21D; C21D8/00; C21D8/12; C21D8/1277; C23; C23C; C23C14/00; C23C14/02; C23C14/027; C23C14/028; C23C14/06; C23C14/0635; C23C14/0641; C23C14/58; C23C14/5806; C23C16/00; C23C16/02; C23C16/0209; C21D8/1283; Y; Y10; Y10S; Y10S428/00; Y10S428/90; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12542; Y10T428/12576
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
83 words
An extra-low iron loss grain oriented silicon steel sheet comprising a base metal of grain oriented silicon steel and a thin coat of at least one layer composed of at least one of nitrides and carbides of Ti, Zr, Hf, V, Nb, Ta, Mn, Cr, Mo, W, Co, Ni, Al, B and Si and strongly adhered to all finished surfaces of the base metal through a mixed layer of the base metal and the thin coat, and having a thickness of 0.005-2 μm.
Claim 2
Dependent Claim
83 words
An extra-low iron loss grain oriented silicon steel sheet comprising a base metal of grain oriented silicon steel and a thin coat of at least one layer composed of at least one of nitrides and carbides of Ti, Zr, Hf, V, Nb, Ta, Mn, Cr, Mo, W, Co, Ni, Al, B and Si and strongly adhered to all finished surfaces of the base metal through a mixed layer of the base metal and the thin coat, and having a thickness of 0.005-2 μm.
Claim 3
Dependent Claim
60 words
The extra-low iron loss grain oriented silicon steel sheet according to claim 1, wherein said base metal is obtained by starting from a silicon steel comprising 0.01-0.06% by weight of C, 2.0-4.0% by weight of Si, 0.01-0.20% by weight of Mn, 0.005-0.05% by weight in total of at least one of S and Se, and the remainder being substantially Fe.
Claim 4
Dependent Claim
24 words
The extra-low iron loss grain oriented silicon steel sheet according to claim 2, wherein said silicon steel further contains 0.005-0.20% by weight of Sb.
Claim 5
Dependent Claim
30 words
The extra-low iron loss grain oriented silicon steel sheet according to claim 2, wherein said silicon steel further contains 0.005-0.20% by weight of Sb and 0.003-0.1% by weight of Mo.
Claim 6
Dependent Claim
30 words
The extra-low iron loss grain oriented silicon steel sheet according to claim 2, wherein said silicon steel further contains 0.005-0.06% by weight of sol.Al and 0.001-0.01% by weight of N.
Claim 7
Dependent Claim
35 words
The extra-low iron loss grain oriented silicon steel sheet according to claim 2, wherein said silicon steel further contains 0.005-0.06% by weight of sol.Al, 0.003-0.1% by weight of Mo and 0.001-0.01% by weight of N.
Claim 8
Dependent Claim
40 words
The extra-low iron loss grain oriented silicon steel sheet according to claim 2, wherein said silicon steel further contains 0.005-0.06% by weight of sol.Al, 0.001-0.01% by weight of N, 0.01-0.5% by weight of Sn and 0.01-1.0% by weight of Cu.
Claim 9
Dependent Claim
30 words
The extra-low iron loss grain oriented silicon steel sheet according to claim 2, wherein said silicon steel further contains 0.0003-0.02% by weight of B and 0.001-0.01% by weight of N.
Claim 10
Dependent Claim
35 words
The extra-low iron loss grain oriented silicon steel sheet according to claim 2, wherein said silicon steel further contains 0.0003-0.02% by weight of B, 0.001-0.01% by weight of N and 0.01-1.0% by weight of Cu.
Claim 11
Dependent Claim
19 words
The extra-low iron loss grain oriented silicon steel sheet according to claim 1, wherein said thickness is 0.05-1.5 μm.
Claim 12
Dependent Claim
21 words
The extra-low iron loss grain oriented silicon steel sheet according to claim 1, wherein said thin coat is under a tension.
Claim 13
Dependent Claim
31 words
The extra-low iron loss grain oriented silicon steel sheet according to claim 1 wherein said thin coat is provided thereon with an insulating coating consisting essentially of phosphate and colloidal silica.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-10-05 | 1991-04-06 | 1991-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-05 | 1995-04-06 | 1995-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-05 | 1999-04-06 | 1999-10-06 | $7700.00 | Window Closed / Lapsed |