US4989762A
Expired / Lapsed
US
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Molten steel pouring nozzle
Assignee: Akechi Ceramics Co Ltd
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Filing: 1990-01-02
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Granted: 1991-02-05
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Expires: 2010-01-02
Abstract
Abstract A molten steel pouring nozzle having along the axis thereof a bore through which molten steel flows. At least part of an inner portion of the molten steel pouring nozzle, which inner portion forms said bore, is formed with a refractory consisting essentially of: zirconia clinker comprising cubic zirconia and calcium zirconate: from 40 to 85 wt. %, where, the content of calcium oxide in said zirconia clinker being within the range of from 3 to 35 weight parts relative to 100 weight parts of said zirconia clinker; graphite: from 10 to 30 wt. %; and at least one element selected from the group consisting of: silica: from 1 to 15 wt. %, and magnesia: from 1 to 15 wt. %.
Inventors
- 👤 Mitsuru Ando
- 👤 Takafumi Aoki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:21
CPC Classifications
B; B22; B22D; B22D41/00; B22D41/50; B22D41/52; B22D41/54; B22D11/00; B22D11/10; C; C04; C04B; C04B35/00; C04B35/01; C04B35/013; C04B35/10; C04B35/101; C04B35/103; C04B35/48; C04B35/482; C04B35/622; C04B35/626; C04B35/62605; C04B35/62645; C04B35/62665; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3205; C04B2235/3206; C04B2235/3208; C04B2235/3231; C04B2235/3244; C04B2235/3248; C04B2235/34; C04B2235/3418; C04B2235/38; C04B2235/3817; C04B2235/3826; C04B2235/42; C04B2235/422; C04B2235/425; C04B2235/70; C04B2235/74; C04B2235/76; C04B2235/762; C04B2235/768; C04B2235/77; C04B2235/78; C04B2235/786; C04B2235/80; C04B2235/96; C04B2235/963; C04B2235/9669; C04B2235/9676
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
116 words
A molten steel pouring nozzle having along the axis thereof a bore through which molten steel flows, comprising at least part of an inner portion of said molten steel pouring nozzle, which inner portion forms said bore, is formed from a refractory consisting essentially of: from 40 to 85 wt. % of a zirconia clinker comprising cubic zirconia and calcium zirconate, the content of calcium oxide in said zirconia clinker being from 3 to 35 weight parts relative to 100 weight parts of said zirconia clinker; graphite:from 10 to 30 wt. %; and at least one element selected from the group consisting of: silica:from 1 to 15 wt. %, and magnesia:from 1 to 15 wt. %.
Claim 2
Dependent Claim
116 words
A molten steel pouring nozzle having along the axis thereof a bore through which molten steel flows, comprising at least part of an inner portion of said molten steel pouring nozzle, which inner portion forms said bore, is formed from a refractory consisting essentially of: from 40 to 85 wt. % of a zirconia clinker comprising cubic zirconia and calcium zirconate, the content of calcium oxide in said zirconia clinker being from 3 to 35 weight parts relative to 100 weight parts of said zirconia clinker; graphite:from 10 to 30 wt. %; and at least one element selected from the group consisting of: silica:from 1 to 15 wt. %, and magnesia:from 1 to 15 wt. %.
Claim 3
Dependent Claim
24 words
The molten steel pouring nozzle as claimed in claim 1, wherein: the whole of said molten steel pouring nozzle is formed from said refractory.
Claim 4
Dependent Claim
31 words
The molten steel pouring nozzle as claimed in claim 1, wherein: said inner portion of said molten steel pouring nozzle, which inner portion forms said bore, is formed from said refractory.
Claim 5
Dependent Claim
52 words
The molten steel pouring nozzle as claimed in claim 2, wherein: said zirconia clinker has an average particle size of up to 44 μm; said graphite has an average particle size of up to 500 μm; and said silica and said magnesia have an average particle size of up to 20 μm.
Claim 6
Dependent Claim
52 words
The molten steel pouring nozzle as claimed in claim 3, wherein: said zirconia clinker has an average particle size of up to 44 μm; said graphite has an average particle size of up to 500 μm; and said silica and said magnesia have an average particle size of up to 20 μm.
Claim 7
Dependent Claim
31 words
The molten steel pouring nozzle as claimed in claim 2, wherein: said inner portion of said molten steel pouring nozzle, which inner portion forms said bore, is formed from said refractory.
Claim 8
Dependent Claim
52 words
The molten steel pouring nozzle as claimed in claim 1, wherein: said zirconia clinker has an average particle size of up to 44 μm; said graphite has an average particle size of up to 500 μm; and said silica and said magnesia have an average particle size of up to 20 μm.
Claim 9
Dependent Claim
24 words
The molten steel pouring nozzle as claimed in claim 1, wherein said refractory consists essentially of said zirconia clinker, said graphite and said silica.
Claim 10
Dependent Claim
24 words
The molten steel pouring nozzle as claimed in claim 1, wherein said refractory consists essentially of said zirconia clinker, said graphite and said magnesia.
Claim 11
Dependent Claim
26 words
The molten steel pouring nozzle as claimed in claim 1, wherein said refractory consists essentially of said zirconia clinker, said graphite, said silica and said magnesia.
Claim 12
Dependent Claim
36 words
The molten steel pouring nozzle as claimed in claim 1, wherein said refractory consists essentially of 85 wt. % of said zirconia clinker, 10 wt. % of said graphite and 5 wt. % of said silica.
Claim 13
Dependent Claim
42 words
The molten steel pouring nozzle as claimed in claim 1, wherein said refractory consists essentially of 70 wt. % of said zirconia clinker, 10 wt. % of said graphite, 10 wt. % of said silica and 10 wt. % of said magnesia.
Claim 14
Dependent Claim
36 words
The molten steel pouring nozzle as claimed in claim 1, wherein said refractory consists essentially of 80 wt. % of said zirconia clinker, 15 wt. % of said graphite and 5 wt. % of said silica.
References Cited (Backward Citations)
US4585485A
Cited
US4849383A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-02-04 | 1994-08-06 | 1995-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-04 | 1998-08-06 | 1999-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-04 | 2002-08-06 | 2003-02-05 | $7700.00 | Window Closed / Lapsed |