US4085252A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite wire with a base of cerium and other rare earths
Assignee: LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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Filing: 1976-04-16
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Granted: 1978-04-18
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Expires: 1996-04-16
Abstract
Abstract The invention relates to a composite wire with a base of cerium and/or rare earths such as mischmetal and intended for insertion into a bath of molten steel so as to de-oxidize and de-sulphurize the steel. When this composite wire is inserted into molten steel, it controls certain inclusions by converting manganese sulphides to sulphides of rare earths, thereby improving the resilience characteristics of the steel. The composite wire is obtained by enclosing the mischmetal wire in a metallic sheath. The diameter of the wire, the thickness of the sheath and the speed of injection are determined in accordance with characteristic curves representing particular proportional relations.
Inventors
- 👤 Pierre Karinthi
- 👤 Michel Dauvergne
- 👤 Benoit Hirschauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:12
CPC Classifications
B; B22; B22D; B22D11/00; B22D11/10; B22D11/11; B22D17/00; B22D17/20; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12222; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12951
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
61 words
A composite wire having a core formed of at least one rare earth element, said core being enclosed inside a metallic casing and having a diameter d between 1.4 and 8.5 mm. tightly enclosed by said metallic casing, said casing having a thickness e between 0.1 and 1 mm., wherein e is greater than 0.04 d and less than 0.2 d.
Claim 2
Dependent Claim
61 words
A composite wire having a core formed of at least one rare earth element, said core being enclosed inside a metallic casing and having a diameter d between 1.4 and 8.5 mm. tightly enclosed by said metallic casing, said casing having a thickness e between 0.1 and 1 mm., wherein e is greater than 0.04 d and less than 0.2 d.
Claim 3
Dependent Claim
29 words
A composite wire as claimed in claim 1, in which said metallic casing is a steel ribbon enclosing said core with overlapping of the longitudinal edges of said ribbon.
Claim 4
Dependent Claim
52 words
A composite wire for insertion into a bath of molten steel, comprising a core formed of cerium having a diameter d between 1.4 and 8.5 mm. enclosed by a steel sheath having a thickness e between 0.1 and 1 mm. wherein e is greater than 0.04 d and less than 0.2 d.
Claim 5
Dependent Claim
52 words
A composite wire for insertion into a bath of molten steel, comprising a core formed of cerium having a diameter d between 1.4 and 8.5 mm. enclosed by a steel sheath having a thickness e between 0.1 and 1 mm. wherein e is greater than 0.04 d and less than 0.2 d.
Claim 6
Dependent Claim
62 words
A composite wire for insertion into a bath of molten steel, comprising a core formed of cerium and at least one other rare earth element, said core having a diameter d between 1.4 and 8.5 mm. enclosed by a metallic sheath having a thickness e between 0.1 and 1 mm., wherein e is greater than 0.04 d and less than 0.2 d.
Claim 7
Dependent Claim
62 words
A composite wire for insertion into a bath of molten steel, comprising a core formed of cerium and at least one other rare earth element, said core having a diameter d between 1.4 and 8.5 mm. enclosed by a metallic sheath having a thickness e between 0.1 and 1 mm., wherein e is greater than 0.04 d and less than 0.2 d.
Claim 8
Dependent Claim
72 words
A composite wire for insertion into a bath of molten steel to a depth L at a speed of insertion v, said wire comprising a core formed of cerium and having a diameter d enclosed by a steel sheath having a thickness e, wherein L, v, d and e are related as: L = 1.7 (e + 0.35 d) v × 10.sup.-2 meters and wherein d is between 1.4 and 8.5 mm.
Claim 9
Dependent Claim
72 words
A composite wire for insertion into a bath of molten steel to a depth L at a speed of insertion v, said wire comprising a core formed of cerium and having a diameter d enclosed by a steel sheath having a thickness e, wherein L, v, d and e are related as: L = 1.7 (e + 0.35 d) v × 10.sup.-2 meters and wherein d is between 1.4 and 8.5 mm.
Claim 10
Dependent Claim
19 words
A composite wire according to claim 5 wherein e is greater than 0.04 d and less than 0.2 d.
Claim 11
Dependent Claim
18 words
A composite wire according to claim 5 wherein L is greater than 0.3 and less than 1 meter.
Claim 12
Dependent Claim
19 words
A composite wire according to claim 5 wherein v is greater than 3 m/min. and less than 30 m/min.
References Cited (Backward Citations)
US3768999A
Cited
US3729309A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-04-17 | 1981-10-17 | 1982-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-17 | 1985-10-17 | 1986-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-17 | 1989-10-17 | 1990-04-18 | $7700.00 | Window Closed / Lapsed |