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US5348203A
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Molten steel pouring nozzle
Assignee: Akechi Ceramics Co Ltd
•
Filing: 1993-08-20
•
Granted: 1994-09-20
•
Expires: 2013-08-20
Abstract
Abstract A molten steel pouring nozzle which comprises: a nozzle body comprising an alumina-graphite refractory, having, along the axis thereof, a bore through which molten steel flows; and an outer refractory layer arranged on an outside portion of the nozzle body so as to be integral with the nozzle body and to be flush with an outer surface thereof, the outer refractory layer being arranged on a portion of the outside portion of the nozzle body, which portion is in contact, when a lower portion of the molten steel pouring nozzle is immersed into molten steel, with the open air without being immersed into the molten steel, and the outer refractory layer consisting essentially of: -alumina (Al2O3) from 40 to 75 wt. %, -carbon (C) from 10 to 30 wt. %, -silica (SiO2) from 1 to 30 wt. %, -silicon carbide (SiC) from 1 to 20 wt. %, -and -low-melting glass from 1 to 10 wt. %. -
Inventors
- 👤 Mitsuru Andoh
- 👤 Noriaki Yamauchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:18
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/6303; B; B22; B22D; B22D41/00; B22D41/50; B22D41/52; B22D41/54; C04B35/66; C04B2111/00; C04B2111/00474; C04B2111/0087; C04B2111/00887; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3217; C04B2235/34; C04B2235/3418; C04B2235/38; C04B2235/3817; C04B2235/3826; C04B2235/42; C04B2235/422; C04B2235/70; C04B2235/96; C04B2235/9669; C04B2235/9676
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
239 words
A molten steel pouring nozzle which comprises: a nozzle body comprising an alumina-graphite refractory, having, along the axis thereof, a bore through which molten steel flows; and an outer refractory layer arranged on an outside portion of said nozzle body so as to be integral with said nozzle body and to be flush with an outer surface thereof, said outer refractory layer being arranged on a portion of said outside portion of said nozzle body, which portion is in contact, when a lower portion of said molten steel pouring nozzle is immersed into molten steel, with the open air without being immersed into said molten steel, and said outer refractory layer consisting essentially of: ______________________________________
alumina (Al.sub.2 O.sub.3)
from 40 to 75
wt. %
carbon (C) from 10 to 30
wt. %,
silica (SiO.sub.2)
from 1 to 30
wt. %,
silicon carbide (SiC)
from 1 to 20
wt. %,
and
low-melting glass
from 1 to 10
wt. %; and
said low-melting glass consisting essentially of:
alumina (Al.sub.2 O.sub.3)
from 1.5 to wt. %,
silica (SiO.sub.2)
from 20.0 to 56.0
wt. %,
calcium oxide (CaO)
from 2.5 to 14.4
wt. %,
magnesia (MgO) from 0.05 to 1.60
wt. %,
potassium oxide (K.sub.2 O)
from 0.25 to 6.40
wt. %,
sodium oxide (Na.sub.2 O)
from 0.5 to wt. %,
boric acid (B.sub.2 O.sub.3)
from 2.5 to 24.0
wt. %,
and
boron carbide (B.sub.4 C)
from 20.0 to 50.0
wt. %.
______________________________________
Claim 2
Dependent Claim
239 words
A molten steel pouring nozzle which comprises: a nozzle body comprising an alumina-graphite refractory, having, along the axis thereof, a bore through which molten steel flows; and an outer refractory layer arranged on an outside portion of said nozzle body so as to be integral with said nozzle body and to be flush with an outer surface thereof, said outer refractory layer being arranged on a portion of said outside portion of said nozzle body, which portion is in contact, when a lower portion of said molten steel pouring nozzle is immersed into molten steel, with the open air without being immersed into said molten steel, and said outer refractory layer consisting essentially of: ______________________________________
alumina (Al.sub.2 O.sub.3)
from 40 to 75
wt. %
carbon (C) from 10 to 30
wt. %,
silica (SiO.sub.2)
from 1 to 30
wt. %,
silicon carbide (SiC)
from 1 to 20
wt. %,
and
low-melting glass
from 1 to 10
wt. %; and
said low-melting glass consisting essentially of:
alumina (Al.sub.2 O.sub.3)
from 1.5 to wt. %,
silica (SiO.sub.2)
from 20.0 to 56.0
wt. %,
calcium oxide (CaO)
from 2.5 to 14.4
wt. %,
magnesia (MgO) from 0.05 to 1.60
wt. %,
potassium oxide (K.sub.2 O)
from 0.25 to 6.40
wt. %,
sodium oxide (Na.sub.2 O)
from 0.5 to wt. %,
boric acid (B.sub.2 O.sub.3)
from 2.5 to 24.0
wt. %,
and
boron carbide (B.sub.4 C)
from 20.0 to 50.0
wt. %.
______________________________________
Claim 3
Dependent Claim
33 words
A molten steel pouring nozzle as claimed in claim 1, wherein: said outer refractory layer of said molten steel pouring nozzle has a thickness within a range of from 1 to 15 mm.
Claim 4
Dependent Claim
41 words
A molten steel pouring nozzle as claimed in claim 2, wherein the outer refractory layer consists essentially of 49.2 wt. % alumina, 19.4 wt. % carbon, 19.8 wt. % silica, 9.8 wt. % silicon carbide and 1.8 wt. % low-melting glass.
Claim 5
Dependent Claim
41 words
A molten steel pouring nozzle as claimed in claim 2, wherein the outer refractory layer consists essentially of 49.2 wt. % alumina, 19.4 wt. % carbon, 18.8 wt. % silica, 8.1 wt. % silicon carbide and 3.7 wt. % low-melting glass.
Claim 6
Dependent Claim
41 words
A molten steel pouring nozzle as claimed in claim 2, wherein the outer refractory layer consists essentially of 49.2 wt. % alumina, 19.4 wt. % carbon, 17.4 wt. % silica, 7.5 wt. % silicon carbide and 6.5 wt. % low-melting glass.
Claim 7
Dependent Claim
41 words
A molten steel pouring nozzle as claimed in claim 2, wherein the outer refractory layer consists essentially of 49.2 wt. % alumina, 19.4 wt. % carbon, 16.0 wt. % silica, 6.1 wt. % silicon carbide and 9.3 wt. % low-melting glass.
Claim 8
Dependent Claim
55 words
A molten steel pouring nozzle as claimed in claim 2, wherein the low-melting glass consists essentially of 3.1 wt. % alumina, 37.1 wt. % silica, 5.5 wt. % calcium oxide, 0.7 wt. % magnesia, 1.3 wt. % potassium oxide, 4.6 wt. % sodium oxide, 14.4 wt. % boric acid and 33.3 wt. % boron carbide.
Claim 9
Dependent Claim
55 words
A molten steel pouring nozzle as claimed in claim 3, wherein the low-melting glass consists essentially of 3.1 wt. % alumina, 37.1 wt. % silica, 5.5 wt. % calcium oxide, 0.7 wt. % magnesia, 1.3 wt. % potassium oxide, 4.6 wt. % sodium oxide, 14.4 wt. % boric acid and 33.3 wt. % boron carbide.
Claim 10
Dependent Claim
55 words
A molten steel pouring nozzle as claimed in claim 4, wherein the low-melting glass consists essentially of 3.1 wt. % alumina, 37.1 wt. % silica, 5.5 wt. % calcium oxide, 0.7 wt. % magnesia, 1.3 wt. % potassium oxide, 4.6 wt. % sodium oxide, 14.4 wt. % boric acid and 33.3 wt. % boron carbide.
Claim 11
Dependent Claim
55 words
A molten steel pouring nozzle as claimed in claim 5, wherein the low-melting glass consists essentially of 3.1 wt. % alumina, 37.1 wt. % silica, 5.5 wt. % calcium oxide, 0.7 wt. % magnesia, 1.3 wt. % potassium oxide, 4.6 wt. % sodium oxide, 14.4 wt. % boric acid and 33.3 wt. % boron carbide.
Claim 12
Dependent Claim
55 words
A molten steel pouring nozzle as claimed in claim 6, wherein the low-melting glass consists essentially of 3.1 wt. % alumina, 37.1 wt. % silica, 5.5 wt. % calcium oxide, 0.7 wt. % magnesia, 1.3 wt. % potassium oxide, 4.6 wt. % sodium oxide, 14.4 wt. % boric acid and 33.3 wt. % boron carbide.
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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) | 1997-09-19 | 1998-03-21 | 1998-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-09-19 | 2002-03-21 | 2002-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-09-19 | 2006-03-21 | 2006-09-20 | $7700.00 | Window Closed / Lapsed |