US3615909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing a steel packing strip
Assignee: HOESCH AG HAUPTVERWALTUNG
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Filing: 1968-11-22
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Granted: 1971-10-26
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Expires: 1988-11-22
Abstract
Abstract A steel packing strip with a tensile strength of around 95 to 125 kp./mm.2, an elongation of delta 5 of 10 to 17 percent and a yield point ratio of 0.7 to 0.9 is produced from rolled steel strip with a thickness of 0.30 to 1.3 mm. and a composition of about 0.10 to 0.20% C, at most 0.50% Si, possibly as much as 0.060% of P and S, 0.3% to 1% Mn, and the balance substantially all iron which is subjected to a continuous austenitizing annealing at a temperature of more than 820* C. and thereafter quenched in water to produce a structure with discrete particles of stress-laden ferrite.
Inventors
- 👤 Hans-Wilhelm Grasshoff
- 👤 Horst Turck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:11
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/52; C21D9/54; C21D9/56; C21D9/60; C21D8/00; C21D8/02; C21D8/0247; C21D8/0273; C22; C22C; C22C38/00; C21D1/00; C21D1/18; C21D8/0252; Y; Y02; Y02P; Y02P10/00; Y02P10/25
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
17 words
Process according to claim 1 in which the composition includes up to 0.60 percent P and S.
Claim 2
Dependent Claim
18 words
Process according to claim 1 in which the quenching is accomplished by the use of water-cooled quenching surfaces.
Claim 3
Dependent Claim
17 words
Process according to claim 1 in which the steel has been deoxidized by the addition of aluminum.
Claim 4
Dependent Claim
18 words
Process according to claim 1 in which the austenitizing annealing is carried out in the shortest possible time.
Claim 5
Dependent Claim
21 words
Process according to claim 1 in which the austenitizing annealing is carried out in a protecting atmosphere of a neutral gas.
Claim 6
Dependent Claim
13 words
Process according to claim 1 in which the strip is stretched during quenching.
Claim 7
Dependent Claim
27 words
Process according to claim 1 in which during the quenching the band is given a higher tensile Strength than is required and is thereafter relaxed during drying.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-25 | 1975-04-26 | 1975-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-25 | 1979-04-26 | 1979-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-25 | 1983-04-26 | 1983-10-26 | $7700.00 | Window Closed / Lapsed |