US4450016A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing cladding tubes of a zirconium-based alloy for fuel rods for nuclear reactors
Assignee: Santrade Ltd
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Filing: 1981-07-10
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Granted: 1984-05-22
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Expires: 2001-07-10
Abstract
Abstract In the manufacture of cladding tubes of a zirconium-based alloy for fuel rods for nuclear reactors by extrusion of the zirconium-based alloy and cold rollings of the extruded product with annealings, intermediate annealings, between the cold rollings and a β-quenching prior to the last cold rolling, a cladding tube is provided which has at the same time good corrosion properties and mechanical properties by performing the β-quenching prior to a cold rolling, after which an intermediate annealing is performed at a temperature of 500°-610° C.
Inventors
- 👤 Gunnar Vesterlund
- 👤 Erik T. Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:48
CPC Classifications
G; G21; G21C; G21C3/00; G21C3/02; G21C3/04; G21C3/06; G21C3/07; C; C22; C22F; C22F1/00; C22F1/16; C22F1/18; C22F1/186; Y; Y02; Y02E; Y02E30/00; Y02E30/30; Y10; Y10S; Y10S376/00; Y10S376/90
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
131 words
In a method of manufacturing cladding tubes of a zirconium-based alloy for fuel rods for nuclear reactors, the zirconium-based alloy containing 1.2 to 1.7 percent by weight tin, 0.07 to 0.24 percent by weight iron, 0.05 to 0.15 percent by weight chromium, 0 to 0.08% nickel and the balance zirconium and ordinary impurities, the zirconium-based alloy being extruded and the extruded product being subjected to cold rollings and at least one annealing, intermediate annealing, between two consecutive cold rollings and a β-quenching prior to the last cold rolling, the improvement wherein the extruded product is β-quenched prior to a cold rolling, after said cold rolling at least one intermediate annealing is performed at a temperature of 500° to 610° C. said intermediate annealing being performed prior to a further cold rolling.
Claim 2
Dependent Claim
131 words
In a method of manufacturing cladding tubes of a zirconium-based alloy for fuel rods for nuclear reactors, the zirconium-based alloy containing 1.2 to 1.7 percent by weight tin, 0.07 to 0.24 percent by weight iron, 0.05 to 0.15 percent by weight chromium, 0 to 0.08% nickel and the balance zirconium and ordinary impurities, the zirconium-based alloy being extruded and the extruded product being subjected to cold rollings and at least one annealing, intermediate annealing, between two consecutive cold rollings and a β-quenching prior to the last cold rolling, the improvement wherein the extruded product is β-quenched prior to a cold rolling, after said cold rolling at least one intermediate annealing is performed at a temperature of 500° to 610° C. said intermediate annealing being performed prior to a further cold rolling.
Claim 3
Dependent Claim
22 words
A method according to claim 1, including an initial β-quenching of the zirconium-based alloy prior to its extrusion into an extruded product.
Claim 4
Dependent Claim
20 words
A method according to claim 1, wherein the intermediate annealing is performed at a temperature of 500° to 600° C.
Claim 5
Dependent Claim
23 words
A method according to claim 1, including finally annealing the extruded product at a temperature of 400°-610° C. after the last cold rolling.
References Cited (Backward Citations)
US3865635A
Cited
US4287111A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-22 | 1987-11-21 | 1988-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-22 | 1991-11-21 | 1992-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-22 | 1995-11-21 | 1996-05-22 | $7700.00 | Window Closed / Lapsed |