US3848655A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a steel ingot
Assignee: Aikoh Co Ltd
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Filing: 1972-12-20
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Granted: 1974-11-19
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Expires: 1992-12-20
Abstract
Abstract A method of making a steel ingot which comprises pouring molten steel into a steel ingot forming mold having a molded material for maintaining the side portion of the molten steel in a hot condition at the upper portion of the mold, the molded material being disposed either at the upper end of mold as a separate assembly or at the inner surface of the top portion of the mold, covering the top surface of the molten steel, and thus keeping it warm, with a plate-like molded material having a bulk specific gravity of 0.2 to 0.7 and a thickness of at least 10 mm which comprises 30 to 88 percent by weight of a refractory material, 5 to 45 percent by weight of a fibrous substance and 2 to 20 percent by weight of a binder, and casting a steel ingot having a weight of at least 3 tons and a carbon content of not more than 0.7 percent with the amount of the molten steel at the hot upper portion of the mold is at least 10 percent by weight of the steel ingot.
Inventors
- 👤 M Kobayashi
- 👤 Y Sato
- 👤 S Matsuyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:39
CPC Classifications
B; B22; B22D; B22D7/00; B22D7/06; B22D7/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
165 words
A METHOD OF MAKING A STEEL INGOT WHICH COMPRISES POURING AT LEAST 3 TONS OF MOLTEN STEEL INTO A STEEL INGOT FORMING MOLD, SAID MOLD BEING PROVIDED WITH AN INSULATING MATERIAL FOR MAINTAINING THE SIDE PORTION OF THE MOLTEN STEEL IN A HOT CONDITION AT THE UPPER PORTION OF THE MOLD, WITH SAID MOLTEN STEEL HAVING A CARBON CONTENT OF NOT MORE THAN 0.7 PERCENT, WITH THE AMOUNT OF MOLTEN STEEL AT THE HOT UPPER PORTION OF THE MOLD BEING AT LEAST 10 PERCENT BY WEIGHT OF THE STEEL INGOT; COVERING THE TIP SURFACE OF THE MOLTEN STEEL, AND THUS KEEPING IT WARM, WITH A PLATE-LIKE MOLDED MATERIAL HAVING A BULK SPECIFIC GRAVITY OF 0.2 TO 0.7 AND A THICKNESS OF AT LEAST 10 MM WHICH COMPRISES 30 TO 88 PERCENT BY WEIGHT OF A REFRACTORY MATERIAL, 5 TO 45 PERCENT BY WEIGHT OF A FIBROUS SUBSTANCE AND 2 TO 20 PERCENT BY WEIGHT OF A BINDER; AND CASTING A STEEL INGOT IN SAID MOLD.
Claim 2
Independent Claim
165 words
A METHOD OF MAKING A STEEL INGOT WHICH COMPRISES POURING AT LEAST 3 TONS OF MOLTEN STEEL INTO A STEEL INGOT FORMING MOLD, SAID MOLD BEING PROVIDED WITH AN INSULATING MATERIAL FOR MAINTAINING THE SIDE PORTION OF THE MOLTEN STEEL IN A HOT CONDITION AT THE UPPER PORTION OF THE MOLD, WITH SAID MOLTEN STEEL HAVING A CARBON CONTENT OF NOT MORE THAN 0.7 PERCENT, WITH THE AMOUNT OF MOLTEN STEEL AT THE HOT UPPER PORTION OF THE MOLD BEING AT LEAST 10 PERCENT BY WEIGHT OF THE STEEL INGOT; COVERING THE TIP SURFACE OF THE MOLTEN STEEL, AND THUS KEEPING IT WARM, WITH A PLATE-LIKE MOLDED MATERIAL HAVING A BULK SPECIFIC GRAVITY OF 0.2 TO 0.7 AND A THICKNESS OF AT LEAST 10 MM WHICH COMPRISES 30 TO 88 PERCENT BY WEIGHT OF A REFRACTORY MATERIAL, 5 TO 45 PERCENT BY WEIGHT OF A FIBROUS SUBSTANCE AND 2 TO 20 PERCENT BY WEIGHT OF A BINDER; AND CASTING A STEEL INGOT IN SAID MOLD.
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein said insulating material is disposed at the upper end of said mold as a separate assembly.
Claim 4
Dependent Claim
22 words
The method of claim 1 wherein said insulating material is disposed on the inner surface of the top portion of said mold.
Claim 5
Dependent Claim
42 words
The method of claim 1 wherein said refractory material is selected from the group consisting of chrysolite, quartz, sand, silicates, magnesium, alumina, mullite, Alundum, slug, aluminum slug, diatomaceous earth, quartzite, paigeite, obsidian, perlite, magnesite, limestone, dolomite, fly ash, bauxite and mixtures thereof.
Claim 6
Dependent Claim
42 words
The method of claim 1 wherein said fibrous substance is selected from the group materials consisting of pulp, wood sawdust, waste paper, cotton, cellulosic fibers, asbestos, slug wood, rock wool, glass wool, steel wool, regenerated cellulose fibers, artificial fibers and mixtures thereof.
Claim 7
Dependent Claim
34 words
The method of claim 1 wherein said binder is a material selected from the group consisting of phenolformaldehyde resins, urea-formaldehyde resins, furan resins, epoxy resins, water glass, cement, clay, dextrin, starch and mixtures thereof.
Claim 8
Dependent Claim
15 words
The method of claim 1 wherein said plate-like molded material also contains an exothermic substance.
Claim 9
Dependent Claim
23 words
The method of claim 7 wherein said exothermic substance is selected from the group consisting of aluminum, alloys of aluminum and mixtures thereof.
Claim 10
Dependent Claim
13 words
The method of claim 7 wherein said exothermic substance is a carbonaceous substance.
Claim 11
Dependent Claim
31 words
The method of claim 9 wherein said carbonaceous susbstance is selected from the group consisting of coke breeze, charcoal powder, carbonized plant stalks, carbonized seed shells, expanded graphite and mixtures thereof.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |