US4534801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for removing adhered substance from steel ingots
Assignee: Daido Steel Co Ltd
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Filing: 1983-02-17
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Granted: 1985-08-13
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Expires: 2003-02-17
Abstract
Abstract A process for removing an adhered substance from steel ingots, which comprises heating or cooling a steel ingot after the casting under such conditions that the heating or cooling rate at the surface layer portion of the steel ingot is not less than 2 DEG C./sec and the temperature difference between the starting and end points is not less than 300 DEG C.
Inventors
- 👤 Shigeki Matsuoka
- 👤 Yoshihiro Naitoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:53
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/82; B; B22; B22D; B22D11/00; B22D11/12; B22D7/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
89 words
A process for removing an adhered substance from a steel ingot formed by a casting process using molding additives comprising heating said steel ingot subsequent to the casting process with a heating rate at the surface layer portion of the steel ingot being not less than 2° C./second to provide a temperature difference between the starting point and the end point of the heating which is not less than 300° C. whereby said adhered substance caused by said molding additives is removed from the surface of said steel ingot.
Claim 2
Dependent Claim
89 words
A process for removing an adhered substance from a steel ingot formed by a casting process using molding additives comprising heating said steel ingot subsequent to the casting process with a heating rate at the surface layer portion of the steel ingot being not less than 2° C./second to provide a temperature difference between the starting point and the end point of the heating which is not less than 300° C. whereby said adhered substance caused by said molding additives is removed from the surface of said steel ingot.
Claim 3
Dependent Claim
16 words
The process according to claim 1 wherein said heating is performed by electrical resistance heating means.
Claim 4
Dependent Claim
17 words
The process according to claim 1 wherein said heating is performed by high frequency induction heating means.
Claim 5
Dependent Claim
19 words
A process according to claim 1 wherein said steel ingot is produced by casting steel into an ingot mold.
Claim 6
Dependent Claim
18 words
A process according to claim 1 wherein said steel ingot is produced by a continuous casting of steel.
Claim 7
Dependent Claim
89 words
A process for removing an adhered substance from a steel ingot formed by a casting process using molding additives comprising cooling said steel ingot subsequent to said casting process with a cooling rate at the surface layer portion of said steel ingot being not less than 2° C./second to provide a temperature difference between the starting point and the end point of the cooling which is not less than 300° C. whereby said adhered substance caused by said molding additives is removed from the surface of said steel ingot.
Claim 8
Dependent Claim
89 words
A process for removing an adhered substance from a steel ingot formed by a casting process using molding additives comprising cooling said steel ingot subsequent to said casting process with a cooling rate at the surface layer portion of said steel ingot being not less than 2° C./second to provide a temperature difference between the starting point and the end point of the cooling which is not less than 300° C. whereby said adhered substance caused by said molding additives is removed from the surface of said steel ingot.
Claim 9
Dependent Claim
20 words
A process according to claim 6 wherein said cooling is performed by dipping said steel ingot into a water tank.
Claim 10
Dependent Claim
20 words
A process according to claim 6 wherein said cooling is performed by jetting high pressure water onto said steel ingot.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-08-12 | 1989-02-11 | 1989-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-12 | 1993-02-11 | 1993-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-12 | 1997-02-11 | 1997-08-13 | $7700.00 | Window Closed / Lapsed |