US4061801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing aluminum or aluminum alloy coated steel sheets with aid of powder method
Assignee: JFE Steel Corp
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Filing: 1976-06-30
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Granted: 1977-12-06
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Expires: 1996-06-30
Abstract
Abstract A method of producing an aluminum or aluminum alloy coated steel sheet with the aid of powder method is disclosed. The method comprises preliminarily applying a zinc coating having a thickness of 0.01 to 0.3 μm, preferably 0.03 to 0.3 μm to a steel sheet surface, applying an aluminum powder to the zinc coated steel sheet and subjecting the coated steel sheet to steps of heating, rolling and heating again or steps of rolling, heating, rolling again and heating again.
Inventors
- 👤 Motoharu Hamada
- 👤 Shunichi Harada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:33
CPC Classifications
C; C23; C23C; C23C24/00; C23C24/08; C23C24/082; C23C24/085; B; B22; B22F; B22F7/00; B22F7/02; B22F7/04; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12493; Y10T428/12736; Y10T428/1275; Y10T428/12757
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
61 words
A method of producing an aluminum or aluminum alloy coated steel sheet with the aid of powder method, comprising preliminarily electroplating a zinc coating having a thickness of 0.01 to 0.3 μm to a steel sheet surface, applying an aluminum powder to the zinc coated steel sheet, and subjecting to the coated steel sheet steps of heating, rolling and heating again.
Claim 2
Independent Claim
61 words
A method of producing an aluminum or aluminum alloy coated steel sheet with the aid of powder method, comprising preliminarily electroplating a zinc coating having a thickness of 0.01 to 0.3 μm to a steel sheet surface, applying an aluminum powder to the zinc coated steel sheet, and subjecting to the coated steel sheet steps of heating, rolling and heating again.
Claim 3
Dependent Claim
20 words
A method according to claim 1 wherein the thickness of said zinc coating is limited to 0.03 to 0.3 μm.
Claim 4
Dependent Claim
20 words
A method according to claim 1 wherein said zinc coating is obtained by electroplating zinc to the steel sheet surface.
Claim 5
Dependent Claim
29 words
A method according to claim 1 wherein said aluminum powder is applied to the zinc coated steel sheet in a form of suspension containing said aluminum powder dispersed therein.
Claim 6
Dependent Claim
24 words
A method according to claim 1 wherein said aluminum powder is applied to the zinc coated steel sheet in a form of dry powder.
Claim 7
Dependent Claim
17 words
A method according to claim 1 wherein said aluminum powder has a particle size of -250 meshes.
Claim 8
Dependent Claim
17 words
A method according to claim 1 wherein said aluminum powder has a particle size of -320 meshes.
Claim 9
Dependent Claim
18 words
A method according to claim 4 wherein said suspension is composed of water and aluminum powder dispersed therein.
Claim 10
Dependent Claim
39 words
A method according to claim 8 wherein said water is added with an inhibitor selected from the group consisting of a carboxy compound, an oxygen containing compound and nitrogen containing compound and has a pH of 4 to 8.
Claim 11
Dependent Claim
25 words
A method according to claim 4 wherein said suspension is applied to the zinc coated steel sheet within 12 hours after said suspension is prepared.
Claim 12
Dependent Claim
23 words
A method according to claim 1, wherein said coated steel sheet is subjected to steps of rolling, heating, rolling again and heating again.
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) | 1980-12-05 | 1981-06-06 | 1981-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-05 | 1985-06-06 | 1985-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-05 | 1989-06-06 | 1989-12-06 | $7700.00 | Window Closed / Lapsed |