US4116724A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of heat treating cobalt-chromium-molybdenum based alloy and product
Assignee: Fried Krupp AG
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Filing: 1977-05-10
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Granted: 1978-09-26
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Expires: 1997-05-10
Abstract
Abstract A casting alloy consisting essentially of 20 to 40% chromium, 2 to 12% molybdenum, up to 2% silicon, up to 5% manganese, up to 1% carbon, 0.1 to 1% nitrogen, and the remainder cobalt and the usual impurities inherent to the manufacturing process. The alloy is subjected to a heat treatment to homogenize the lattice of the alloy, and thereafter the alloy is rapidly quenched in order to prevent reformation of deposits in the lattice.
Inventors
- 👤 Dieter Hirschfeld
- 👤 Manfred Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 08:05
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/07
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
73 words
Cast alloy consisting essentially of by weight 20 to 40% chromium, 2 to 12% molybdenum, up to 2% silicon, up to 5% manganese, up to 1% carbon and 0.1 to 1% nitrogen, remainder cobalt and the usual impurities inherent to the manufacturing process, said alloy having been subjected to a heat treatment to homogenize the lattice of the alloy, and thereafter having been rapidly quenched to prevent reformation of deposits in the lattice.
Claim 2
Dependent Claim
73 words
Cast alloy consisting essentially of by weight 20 to 40% chromium, 2 to 12% molybdenum, up to 2% silicon, up to 5% manganese, up to 1% carbon and 0.1 to 1% nitrogen, remainder cobalt and the usual impurities inherent to the manufacturing process, said alloy having been subjected to a heat treatment to homogenize the lattice of the alloy, and thereafter having been rapidly quenched to prevent reformation of deposits in the lattice.
Claim 3
Dependent Claim
39 words
Cast alloy of the composition defined in claim 1 wherein the heat treatment to homogenize the lattice occurs after production of the alloy by melting, said heat treatment being a solution heat treatment at a temperature above 1000° C.
Claim 4
Dependent Claim
23 words
Cast alloy of the composition defined in claim 2 wherein the solution heat treatment is effected at a temperature of about 1200° C.
Claim 5
Dependent Claim
21 words
Cast alloy of the composition defined in claim 2 wherein the duration of the solution heat treatment is about one hour.
Claim 6
Dependent Claim
24 words
Cast alloy of the composition defined in claim 1 wherein the quenching step is followed by reheating at a temperature of about 700° C.
Claim 7
Dependent Claim
20 words
Cast alloy of the composition defined in claim 5 wherein the duration of the reheating step is about one hour.
Claim 8
Dependent Claim
42 words
Cast alloy of the composition defined in claim 2 wherein the quenching step is followed by reheating at a temperature of about 700° C, and the duration of the solution heat treatment and of the reheating step are each about one hour.
Claim 9
Independent Claim
81 words
A method for heat treating a cast alloy consisting essentially of by weight 20 to 40% chromium, 2 to 12% molybdenum, up to 2% silicon, up to 5% manganese, up to 1% carbon, 0.1 to 1% nitrogen, and the remainder cobalt and the usual impurities inherent to the manufacturing process, comprising: subjecting the alloy to a heat treatment to homogenize the lattice of the alloy, and then rapidly quenching the alloy in order to prevent reformation of deposits in the lattice.
Claim 10
Independent Claim
81 words
A method for heat treating a cast alloy consisting essentially of by weight 20 to 40% chromium, 2 to 12% molybdenum, up to 2% silicon, up to 5% manganese, up to 1% carbon, 0.1 to 1% nitrogen, and the remainder cobalt and the usual impurities inherent to the manufacturing process, comprising: subjecting the alloy to a heat treatment to homogenize the lattice of the alloy, and then rapidly quenching the alloy in order to prevent reformation of deposits in the lattice.
Claim 11
Dependent Claim
37 words
The method as defined in claim 8, wherein the heat treatment to homogenize the lattice occurs after production of the alloy by melting, said heat treatment being a solution heat treatment at a temperature above 1000° C.
Claim 12
Dependent Claim
22 words
The method as defined in claim 8, wherein the quenching step is followed by reheating at a temperature of about 700° C.
References Cited (Backward Citations)
US3865585A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-09-25 | 1982-03-27 | 1982-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-25 | 1986-03-27 | 1986-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-25 | 1990-03-27 | 1990-09-26 | $7700.00 | Window Closed / Lapsed |