US4142556A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory lining tuyere for metallurgical furnace
Assignee: United States Steel Corp
•
Filing: 1977-05-02
•
Granted: 1979-03-06
•
Expires: 1997-05-02
Abstract
Abstract A refractory lined, abrasion resistant tuyere for a metallurgical furnace is produced by causing an aluminothermic reduction reaction within a cylindrical metal shell, such that the metallic reaction product forms a layer within the cylinder and the slag reaction product forms a second layer overlying the first layer thereby providing an abrasion resistant refractory lining.
Inventors
- 👤 Arthur J. Pignocco
- 👤 Robert H. Kachik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:24
CPC Classifications
F; F16; F16L; F16L57/00; F16L57/06; C; C21; C21B; C21B7/00; C21B7/16; C21C; C21C5/00; C21C5/28; C21C5/42; C21C5/46; C21C5/4606; C21C5/4613; C23; C23C; C23C24/00; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/131; Y10T428/1317
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
94 words
A tuyere for injecting into a metallurgical furnace a process material comprising an abrasive particulate solid and a suspending fluid, comprising: (a) a metal pipe for conveying said process material; (b) a lining deposited in said pipe which comprises the reaction product of an exothermic reaction mixture comprising a powdered fuel metal and a reducible metal oxide, (c) said lining consisting of a first layer consisting essentially of a reduced metal phase metallurgically bonded to said pipe, and a second layer overlying said first layer and consisting essentially of an abrasion-resistant, refractory metal oxide.
Claim 2
Dependent Claim
94 words
A tuyere for injecting into a metallurgical furnace a process material comprising an abrasive particulate solid and a suspending fluid, comprising: (a) a metal pipe for conveying said process material; (b) a lining deposited in said pipe which comprises the reaction product of an exothermic reaction mixture comprising a powdered fuel metal and a reducible metal oxide, (c) said lining consisting of a first layer consisting essentially of a reduced metal phase metallurgically bonded to said pipe, and a second layer overlying said first layer and consisting essentially of an abrasion-resistant, refractory metal oxide.
Claim 3
Dependent Claim
23 words
A tuyere according to claim 1, wherein said pipe metal is a ferrous-base metal, and said reduced metal phase is a ferrous-base metal.
Claim 4
Dependent Claim
23 words
A tuyere in accordance with claim 1, wherein said pipe metal is a stainless steel containing at least about 10 weight percent chromium.
References Cited (Backward Citations)
US1280268A
Cited
US1817888A
Cited
US1796819A
Cited
US2011955A
Cited
US2515191A
Cited
US2623809A
Cited
US2809407A
Cited
US2870498A
Cited
US3050409A
Cited
US3136013A
Cited
US3203785A
Cited
US3262163A
Cited
US3396776A
Cited
US3638978A
Cited
US3744369A
Cited
US3830173A
Cited
US3871875A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-03-05 | 1982-09-04 | 1983-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-05 | 1986-09-04 | 1987-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-05 | 1990-09-04 | 1991-03-06 | $7700.00 | Window Closed / Lapsed |