US4130423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulverulent composition for forming protective layer on steel melts
Assignee: Institut de Recherches de la Siderurgie Francaise IRSID
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Filing: 1977-03-31
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Granted: 1978-12-19
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Expires: 1997-03-31
Abstract
Abstract A composition for forming a protective layer or slag at the surface of molten steel in the mold during a continuous casting process. The composition is constituted by a mixture of a natural silicate of low melting point and an elevated contents of alkaline oxides, a basic compound, a flux and pulverulent carbon. The natural silicate is a feldspar, a nepheline or nepheline-syenite. The composition is intended for use in continuous steel casting processes.
Inventors
- 👤 Marc Chastant
- 👤 Paul-Victor Riboud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:17
CPC Classifications
B; B22; B22D; B22D1/00; B22D11/00; B22D11/10; B22D11/11; B22D11/111; C; C21; C21C; C21C7/00; C21C7/04; C21C7/076; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
102 words
Composition for forming a protective layer over molten steel in continuous casting processes, the said composition comprising a mixture of a natural silicate, a flux selected from the group consisting of sodium carbonate, fluorspar (CaF 2 ) cryolite, borates and alkali or earth alkali fluorides and pulverulent carbon, the natural silicate being a rock of the system Na Al SiO 4 - K Al SiO 4 - SiO 2 , and the said rock having a solidification temperature below 1100° C. and including oxides of sodium and potassium at a ratio as follows {% Na.sub.2 O} + 0.73 {% K.sub.2 O} 10%.
Claim 2
Dependent Claim
102 words
Composition for forming a protective layer over molten steel in continuous casting processes, the said composition comprising a mixture of a natural silicate, a flux selected from the group consisting of sodium carbonate, fluorspar (CaF 2 ) cryolite, borates and alkali or earth alkali fluorides and pulverulent carbon, the natural silicate being a rock of the system Na Al SiO 4 - K Al SiO 4 - SiO 2 , and the said rock having a solidification temperature below 1100° C. and including oxides of sodium and potassium at a ratio as follows {% Na.sub.2 O} + 0.73 {% K.sub.2 O} 10%.
Claim 3
Dependent Claim
25 words
The composition of claim 1 in which a basic compound obtained from a blast furnace slag or from Portland cement is added to the composite.
Claim 4
Dependent Claim
20 words
The composition of claim 1 in which the natural silicate belongs to the group constituted by feldspar, nephelines, and nepheline-syenites.
Claim 5
Dependent Claim
22 words
The composition of claim 1 in which the flux is present in the form of a basic flux and a fluorine-containing flux.
Claim 6
Dependent Claim
19 words
The composition of claim 4 in which the basic flux belongs to the group of sodium carbonates and borates.
Claim 7
Dependent Claim
22 words
The composition of claim 4 in which the fluorine-contained flux belongs to the group of cryolite, alkaline fluorides and earth alkaline fluorides.
Claim 8
Dependent Claim
42 words
The composition of claim 4 which comprises the following ______________________________________
natural silicate 20 - 60% by weight
Portland cement 0 - 50% "
sodium flux 5- 25% "
a fluorine-containing flux
0 - 25% "
powdered carbon 1 - 6% "
______________________________________
Claim 9
Dependent Claim
33 words
The composition of claim 4 which comprises the following ______________________________________
nepheline-syenite 35% by weight
Portland cement 30% " "
sodium carbonate 15% " "
fluorspar 15% " "
carbon 5% " "
______________________________________
Claim 10
Dependent Claim
32 words
The composition of claim 1 in which a lithium silicate partly replaces said natural silicates forming part of said system provided that the total mixture complies with the specification of claim 1.
Claim 11
Dependent Claim
32 words
The composition of claim 1 in which a calcium silicate partly replaces said natural silicates forming part of said system provided that the total mixture complies with the specifications of claim 1.
Claim 12
Dependent Claim
16 words
The composition of claim 4 wherein the flux is a mixture of sodium carbonate and fluorspar.
References Cited (Backward Citations)
US3215522A
Cited
US3309196A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-12-18 | 1982-06-19 | 1982-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-18 | 1986-06-19 | 1986-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-18 | 1990-06-19 | 1990-12-19 | $7700.00 | Window Closed / Lapsed |