US3655459A
Expired / Lapsed
US
⏱️ 0.0 years remaining
METHOD FOR PRODUCING MINIMUM-RIDGING TYPE 430 Mo STAINLESS STEEL SHEET AND STRIP
Assignee: United States Steel Corp
•
Filing: 1970-08-13
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Granted: 1972-04-11
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Expires: 1990-08-13
Abstract
Abstract A process for producing a Type 430 Mo stainless steel sheet product with substantially reduced ridging characteristics when drawn. Commencing in slab form, the Type 430 Mo steel is hot rolled at 2000*-2100*F and finished at below 1400*F, with a reduction of at least 30 percent per pass; box annealed at 17501850*F for at least 10 hours and then at 1450*-1500*F for at least 2 hours; cold rolled to final thickness; and continuous annealed at 1575*-1625*F.
Inventors
- 👤 Kenneth G Brickner
- 👤 George A Ratz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:43
CPC Classifications
C; C21; C21D; C21D8/00; C21D8/02; C21D8/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
20 words
The process of claim 1 in which the cold rolling effects a thickness reduction of from 30 to 50 percent.
Claim 2
Dependent Claim
26 words
The process of claim 1 in which the cold rolling is performed in two steps with an intermediate continuous anneal of from 1575* to 1625* F.
Claim 3
Dependent Claim
25 words
A Type 430 Mo stainless steel sheet product having substantially reduced ridging characteristics when drawn, consisting of the steel produced in accordance with claim 1.
References Cited (Backward Citations)
US3139358A
Cited
US3201231A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |