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US4086105A
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Method of producing fine-grain sheet or fine-grain plate of austenitic steels
Assignee: Voestalpine AG
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Filing: 1977-02-01
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Granted: 1978-04-25
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Expires: 1997-02-01
Abstract
Abstract In a method of producing fine-grain sheet or plate, in particular fine-grain plate with a thickness of more than 50 mm, of austenitic steels by hot rolling billets or slabs in a number of passes, the mean velocity of the reduction in thickness (v in mm/min) achieved in a plurality of subsequent passes in dependence upon the ferrite content (f in %) of the steels is chosen in a manner that up to a ferrite content of 3.5%, the mean velocity of the reduction in thickness is more than 150 mm/min, and at a ferrite content of more than 3.5%, it is above a value given by the relationship v = 3.8 f 2 - 60 f + 315, the deformation carried out in this manner amounting to at least 30%.
Inventors
- 👤 Max Mayrhofer
- 👤 Walter Taschner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:34
CPC Classifications
C; C21; C21D; C21D8/00; C21D8/02; B; B21; B21B; B21B1/00; B21B1/02; B21B1/026
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
143 words
In a method of producing fine-grain sheet or fine-grain plate of austenitic steels, in particular fine-grain plate having a thickness exceeding 50 mm, by hot rolling rolling stock in a number of passes, the improvement which is characterised in that the mean velocity of the reduction in thickness (v in mm/min) achieved in a plurality of subsequent passes in dependence upon the ferrite content (f in %) of the steels, is chosen in a manner that up to a ferrite content of 3.5% the mean velocity of the reduction in thickness is more than 150 mm/min and at a ferrite content of more than 3.5% the mean velocity of the reduction in thickness is above a value given by the relationship v = 3.8 f 2 - 60 f + 315, the deformation carried out in this manner amounting to at least 30%.
Claim 2
Dependent Claim
143 words
In a method of producing fine-grain sheet or fine-grain plate of austenitic steels, in particular fine-grain plate having a thickness exceeding 50 mm, by hot rolling rolling stock in a number of passes, the improvement which is characterised in that the mean velocity of the reduction in thickness (v in mm/min) achieved in a plurality of subsequent passes in dependence upon the ferrite content (f in %) of the steels, is chosen in a manner that up to a ferrite content of 3.5% the mean velocity of the reduction in thickness is more than 150 mm/min and at a ferrite content of more than 3.5% the mean velocity of the reduction in thickness is above a value given by the relationship v = 3.8 f 2 - 60 f + 315, the deformation carried out in this manner amounting to at least 30%.
Claim 3
Dependent Claim
15 words
A method as set forth in claim 1, wherein said rolling stock is an ingot.
Claim 4
Dependent Claim
15 words
A method as set forth in claim 1, wherein said rolling stock is a slab.
Claim 5
Dependent Claim
29 words
A method as set forth in claim 1, wherein up to the ferrite content of 3.5% the mean velocity of the reduction in thickness is more than 200 mm/min.
Claim 6
Dependent Claim
43 words
A method as set forth in claim 1, wherein at a ferrite content of more than 3.5% the mean velocity of the reduction in thickness is above a value given by the relationship v = 3.8 f 2 - 60 f + 365.
Claim 7
Dependent Claim
24 words
A method as set forth in claim 1, wherein the rolling stock is deformed in dependence upon the ferrite content by at least 50%.
Claim 8
Dependent Claim
30 words
A method as set forth in claim 1, wherein passes carried out after the plurality of passes in dependence upon the ferrite content only serve for a precise measure adjustment.
Claim 9
Dependent Claim
42 words
A method as set forth in claim 1, wherein the rolling stock is rolled and simultaneously repeatedly heated up and wherein the rolling stock is deformed in dependence upon the ferrite content after it has been heated up for the last time.
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) | 1981-04-24 | 1981-10-24 | 1982-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-24 | 1985-10-24 | 1986-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-24 | 1989-10-24 | 1990-04-25 | $7700.00 | Window Closed / Lapsed |