Patent US5505348A successfully refreshed from Google Patents.
US5505348A
Expired / Lapsed
US
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Molten steel pouring nozzle
Assignee: Akechi Ceramics Co Ltd
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Filing: 1994-12-29
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Granted: 1996-04-09
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Expires: 2014-12-29
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 the bore, is formed of a refractory consisting essentially of: zirconia clinker comprising calcium zirconate: from 40 to 64.9 wt. %, where, a content of calcium oxide in the zirconia clinker being within a range of from 8 to 35 weight parts relative to 100 weight parts of the zirconia clinker, graphite: from 10 to 35 wt. %, and calcium silicate: from 25.1 to 50 wt. %, where, a content of calcium oxide in the calcium silicate being within a range of from 40 to 54 weight parts relative to 100 weight parts of the calcium silicate.
Inventors
- 👤 Toshiyuki Muroi
- 👤 Yoshiyuki Kondo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:47
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/66; B; B22; B22D; B22D41/00; B22D41/50; B22D41/52; B22D41/54; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3231; C04B2235/3244; C04B2235/34; C04B2235/3427; C04B2235/42; C04B2235/422
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
154 words
A molten steel pouring nozzle for use for molten steel containing 0.06 to 0,10 wt. % aluminum having, along the axis thereof, a bore through which molten steel flows, wherein: at least part of an inner portion of said molten steel pouring nozzle, which inner portion forms said bore, is formed of a refractory consisting essentially of: zirconia clinker comprising calcium zirconate: from 40 to 64.9 wt. %, where, a content of calcium oxide in said zirconia clinker being within a range of from 8 to 35 weight parts relative to 100 weight parts of said zirconia clinker, graphite: from 10 to 35 wt. %, and calcium silicate: from 25.1 to 50 wt. %, where, a content of calcium oxide in said calcium silicate being within a range of from 40 to 54 weight parts relative to 100 weight parts of said calcium silicate; and wherein said refractory has porosity of at least 20.2%.
Claim 2
Dependent Claim
154 words
A molten steel pouring nozzle for use for molten steel containing 0.06 to 0,10 wt. % aluminum having, along the axis thereof, a bore through which molten steel flows, wherein: at least part of an inner portion of said molten steel pouring nozzle, which inner portion forms said bore, is formed of a refractory consisting essentially of: zirconia clinker comprising calcium zirconate: from 40 to 64.9 wt. %, where, a content of calcium oxide in said zirconia clinker being within a range of from 8 to 35 weight parts relative to 100 weight parts of said zirconia clinker, graphite: from 10 to 35 wt. %, and calcium silicate: from 25.1 to 50 wt. %, where, a content of calcium oxide in said calcium silicate being within a range of from 40 to 54 weight parts relative to 100 weight parts of said calcium silicate; and wherein said refractory has porosity of at least 20.2%.
Claim 3
Dependent Claim
24 words
A molten steel pouring nozzle as claimed in claim 1, wherein: the entirety of said molten steel pouring nozzle is formed of said refractory.
Claim 4
Dependent Claim
31 words
A 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 of said refractory.
Claim 5
Dependent Claim
50 words
A 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 calcium silicate has an average particle size of up to 44 μm.
Claim 6
Dependent Claim
50 words
A 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 calcium silicate has an average particle size of up to 44 μm.
Claim 7
Dependent Claim
50 words
A 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 calcium silicate has an average particle size of up to 44 μm.
Claim 8
Dependent Claim
18 words
A molten steel pouring nozzle as claimed in claim 1, wherein said refractory has a porosity of 20.2%.
Claim 9
Dependent Claim
18 words
A molten steel pouring nozzle as claimed in claim 1, wherein said refractory has a porosity of 21.1%.
Claim 10
Dependent Claim
18 words
A molten steel pouring nozzle as claimed in claim 1, wherein said refractory has a porosity of 21.7%.
Claim 11
Dependent Claim
18 words
A molten steel pouring nozzle as claimed in claim 1, wherein said refractory has a porosity of 22.0%.
References Cited (Backward Citations)
JPS5771860A
Cited
US4691844A
Cited
GB2227962A
Cited
DE4100352A1
Cited
JPH03221249A
Cited
GB2263428A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-04-09 | 1999-10-09 | 2000-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-04-09 | 2003-10-09 | 2004-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-04-09 | 2007-10-09 | 2008-04-09 | $7700.00 | Window Closed / Lapsed |