US4010936A
Expired / Lapsed
US
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Process for tapping a steel-making converter
Assignee: Aikoh Co Ltd
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Filing: 1976-03-15
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Granted: 1977-03-08
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Expires: 1996-03-15
Abstract
Abstract A stopper plug for a converter tap hole comprising a molding of a refractory material, a fibrous substance and a binder.
Inventors
- 👤 Masaru Takashima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:55
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B33/00; C04B33/02; C04B33/13; C04B33/132; C04B33/135; C04B33/1352; C04B33/22; C04B33/36; C04B35/01; C04B35/03; C04B35/04; C04B35/043; C04B35/057; C04B35/06; C04B35/10; C04B35/101; C04B35/14; C04B35/16; C04B35/18; C04B35/185; C04B35/6303; C04B35/632; C04B35/634; C04B35/63448; C04B35/63452; C04B35/63472; C04B35/63476; C04B35/63484; C04B35/636; C04B35/66; C04B35/71; C04B35/74; C04B35/76; C04B35/78; C04B35/80; C21; C21C; C21C5/00; C21C5/28; C21C5/42; C21C5/46; C21C5/4653; C04B2111/00; C04B2111/00474; C04B2111/0087; C04B2111/00887; C04B2235/00; C04B2235/02; C04B2235/50; C04B2235/52; C04B2235/5208; C04B2235/70; C04B2235/94; C04B2235/95; C04B2235/96; C04B2235/9669; C04B2235/9676; Y; Y02; Y02P; Y02P40/00; Y02P40/60
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
131 words
A process for tapping a converter of a steel-making furnace which converter has a tap hole, which comprises (1) placing a stopper plug in the tap hole located at the upper part of a wall of the converter when said converter is in an upright position, said stopper plug comprising a refractory material, a fibrous substance and a binder and being elastic and capable of shrinking and deformation, said stopper plug being larger in diameter than the diameter of the tap hole; and (2) tilting the converter such that the molten steel therein contacts the stopper plug and exerts an increasing pressure on the stopper plug as the tilting proceeds, said stopper plug not being forced out of said tap hole until said stopper plug is completely covered with molten steel.
Claim 2
Dependent Claim
131 words
A process for tapping a converter of a steel-making furnace which converter has a tap hole, which comprises (1) placing a stopper plug in the tap hole located at the upper part of a wall of the converter when said converter is in an upright position, said stopper plug comprising a refractory material, a fibrous substance and a binder and being elastic and capable of shrinking and deformation, said stopper plug being larger in diameter than the diameter of the tap hole; and (2) tilting the converter such that the molten steel therein contacts the stopper plug and exerts an increasing pressure on the stopper plug as the tilting proceeds, said stopper plug not being forced out of said tap hole until said stopper plug is completely covered with molten steel.
Claim 3
Dependent Claim
49 words
The process of claim 1, wherein said refractory material in said stopper plug is at least one of silica, quartz, magnesia, olivine, sand, mullite, aluminum oxide, chamotte, aluminum ash, dolomite, magnesite, limestone, fly ash, bauxite, diatomaceous earth, lapilli, expanded vermiculite, expanded shale, expanded obsidian, expanded perlite, or expanded pitch-stone.
Claim 4
Dependent Claim
61 words
The process of claim 1, wherein said fibrous substance in said stopper plug is at least one of an inorganic fibrous substance selected from the group consisting of asbestos, rock wook, slag wool, glass wool and steel wool, an organic fibrous substance selected from the group consisting of pulp, a cellulosic substance made by unbinding paper, cotton, flax, and synthetic fibers.
Claim 5
Dependent Claim
36 words
The process of claim 1, wherein said binder in said stopper plug is at least one of a phenol-formaldehyded resin, a ureaformaldehyde resin, a furan resin, an epoxy resin, dextrin, starch, water glass, cement or clay.
Claim 6
Dependent Claim
13 words
The process of claim 1, wherein said stopper plug includes a combustible substance.
Claim 7
Dependent Claim
23 words
The process of claim 5, wherein said combustible substance is at least one of wood powder, saw dust, coke powder or coal powder.
Claim 8
Dependent Claim
62 words
The process of claim 6, wherein said stopper plug comprises about 40% to 70% by weight of said refractory material, about 15 to 35% by weight of said organic fibrous substance, about 5 to 20% by weight of said inorganic fibrous substance, about 5 to 20% by weight of said combustible substance and about 1 to 70% by weight of said binder.
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) | 1980-03-07 | 1980-09-06 | 1981-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-07 | 1984-09-06 | 1985-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-07 | 1988-09-06 | 1989-03-08 | $7700.00 | Window Closed / Lapsed |