US3810506A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molding for use in steel ingot making by bottom pouring and method of making steel ingot
Assignee: Aikoh Co Ltd
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Filing: 1972-12-04
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Granted: 1974-05-14
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Expires: 1992-12-04
Abstract
Abstract An erupting flow of molten steel in the early stage of the bottom pouring method to make a steel ingot is interrupted by disposing at the bottom of an ingot-making mold a molding which comprises about 40 to 96 percent by weight of a refractory material, 2 to about 50 percent by weight of a fibrous material and 2 to about 20 percent by weight of a binder. The molding has a size such that it is larger than the steel run-out hole in mold and can rise and float on the top surface of the molten steel within the mold. Thus, splashing can be prevented and a smooth casting surface can be obtained. The molding and the process are disclosed.
Inventors
- 👤 H Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:15
CPC Classifications
B; B22; B22D; B22D7/00; B22D7/12
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
32 words
The molding of claim 1 which further includes a material capable of generating a gas during bottom pouring to form a reducing atmosphere which prevents the atmosphere from contacting the molten steel.
Claim 2
Dependent Claim
20 words
The molding of claim 2 wherein said material is selected from the group consisting of fluorides, chlorides and carbonaceous substances.
Claim 3
Dependent Claim
11 words
The molding of claim 1 which further includes a slag-forming agent.
Claim 4
Dependent Claim
13 words
The molding of claim 1 which further includes a melting point controlling agent.
Claim 5
Dependent Claim
20 words
The molding of claim 4 wherein said slag-forming agent is selected from the group consisting of limestone and calcium fluoride.
Claim 6
Dependent Claim
34 words
The molding of claim 5 wherein the melting point controlling agent is selected from the group consisting of cryolite, sodium fluoride or chloride, potassium fluoride or chloride, manganese oxide, sodium carbonate and potassium carbonate.
Claim 7
Dependent Claim
42 words
The molding of claim 1 wherein the refractory material is selected from the group consisting of olivine, quartz, silica sand, a refractory silicate, magnesia, alumina, mullite, slag, aluminum ash, diatomaceous earth, vermiculite, shale, obsidian, pearlite, magnesite, limestone, dolomite, fly ash and bauxite.
Claim 8
Dependent Claim
36 words
The molding of claim 1 wherein the fibrous material is selected from the group consisting of wood pulp, wood sawdust, beaten waste paper, cotton, asbestos, slag wool, rock wool, glass wool, steel wool and artificial fibers.
Claim 9
Dependent Claim
23 words
The molding of claim 1 wherein the binder is selected from the group consisting of resins, water glass, cements, clays, dextrin and starch.
Claim 10
Dependent Claim
25 words
The molding of claim 10 wherein the resin is selected from the group consisting of a phenol-formaldehyde resin, urea-formaldehyde resin, furan resin and epoxy resin.
Claim 11
Dependent Claim
116 words
In a method of making steel ingot by the bottom pouring method, the improvement wherein a molding comprising from about 40 to 96 percent by weight of a refractory material, from 2 to about 50 percent by weight of a fibrous material and from 2 to about 20 percent by weight of a binder and having a size such that it is larger than the diameter of the run-out hole in the mold for the introduction of molten steel into the mold and can rise and float on the top surface of molten steel within the mold is provided at the bottom of the mold to thereby interrupt an erupting stream of molten steel during pouring.
Claim 12
Dependent Claim
42 words
The method of claim 12 wherein the refractory material is selected from the group consisting of olivine, quartz, silica sand, a refractory silicate, magnesia, alumina, mullite, slag, aluminum ash, diatomaceous earth, vermiculite, shale, obsidian, pearlite magnesite, limestone, dolomite, fly ash and bauxite.
Claim 13
Dependent Claim
36 words
The method of claim 12 wherein the fibrous material is selected from the group consisting of wool pulp, wood sawdust, beaten waste paper, cotton, asbestos, slag wool, rock wool, glass wool, steel wool and artificial fibers.
Claim 14
Dependent Claim
23 words
The method of claim 12 wherein the binder is selected from the group consisting of resins, water glass, cements, clays, dextrin and starch.
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) | 1977-05-13 | 1977-11-12 | 1978-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-13 | 1981-11-12 | 1982-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-13 | 1985-11-12 | 1986-05-14 | $7700.00 | Window Closed / Lapsed |