Patent US3699726A successfully refreshed from Google Patents.
US3699726A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of descaling
Assignee: Individual
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Filing: 1971-03-26
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Granted: 1972-10-24
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Expires: 1991-03-26
Abstract
Abstract Dry descaling of steel strip by a combination of thermal and mechanical treatments. A strip of steel is heated in normal furnace atmosphere to a temperature at which the magnetite scale converts to softer, more porous wustite and then rapidly cooled by air jets. Subsequently, the cooled strip is flexed to crack the scale and abrasive blasted to remove the cracked scale.
Inventors
- 👤 Charles A Turner
- 👤 Ernst A Siemssen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:01
CPC Classifications
B; B24; B24C; B24C1/00; B24C1/08; B24C1/086; B23; B23D; B23D79/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
125 words
The method of descaling strip metal having a scale on its surfaces which comprises, moving the metal continuously through a path having a plurality of stations located at spaced points along said path, at a first station heating said strip to a temperature of at least 1,000* F in a normal furnace atmosphere, rapidly cooling said strip in air to a temperature below 600* F at a second station that is located at a point along said path immediately beyond said first station, flexing said strip in opposite directions as it is moving at a station located beyond the cooling station, and, mechanically cleaning said strip by abrasive means at a station located beyond said flexing station in the path of travel of said strip.
Claim 2
Independent Claim
125 words
The method of descaling strip metal having a scale on its surfaces which comprises, moving the metal continuously through a path having a plurality of stations located at spaced points along said path, at a first station heating said strip to a temperature of at least 1,000* F in a normal furnace atmosphere, rapidly cooling said strip in air to a temperature below 600* F at a second station that is located at a point along said path immediately beyond said first station, flexing said strip in opposite directions as it is moving at a station located beyond the cooling station, and, mechanically cleaning said strip by abrasive means at a station located beyond said flexing station in the path of travel of said strip.
Claim 3
Dependent Claim
30 words
The method of claim 1 in which said strip is heated in a gas fired furnace in the presence of combustion gases which may or may not include free oxygen.
Claim 4
Dependent Claim
22 words
The method of claim 1 in which the strip is cooled by blowing sheets of air against opposite surfaces of the sheet.
Claim 5
Dependent Claim
32 words
The method of claim 1 in which the strip is flexed by passing it partially around a plurality of parallel rolls whose axes are offset in the direction of the sheet surface.
Claim 6
Dependent Claim
19 words
The method of claim 1 in which the sheet is cleaned by impacting its surfaces with an abrasive material.
Claim 7
Dependent Claim
38 words
The method of claim 1 in which the heating of the strip continues for a length of time sufficient to change the character of the scale at least at the interface of the scale and the parent metal.
Claim 8
Dependent Claim
20 words
The method of claim 1 in which the strip is heated to a temperature between 1,000* F and 1,350* F.
Claim 9
Independent Claim
147 words
The method of descaling cold-rolled, strip metal having a scale on its surface which comprises: moving the strip continuously through a path having a plurality of stations located along said path, heating the strip at a first station in said path by direct exposure to combustion gases to a temperature of between 1, 000* F and 1,400* F for a time sufficient to change the character of the scale at least at its interface with the parent metal, immediately after the heating step rapidly cooling the strip below 600* F at a second station by blowing sheets of air against its opposite sides, at a third station along said path flexing the strip by bending it partially around a series of rollers located across said path, and at a next location along said path impacting the surfaces of said strip with an abrasive to remove the scale.
Claim 10
Independent Claim
147 words
The method of descaling cold-rolled, strip metal having a scale on its surface which comprises: moving the strip continuously through a path having a plurality of stations located along said path, heating the strip at a first station in said path by direct exposure to combustion gases to a temperature of between 1, 000* F and 1,400* F for a time sufficient to change the character of the scale at least at its interface with the parent metal, immediately after the heating step rapidly cooling the strip below 600* F at a second station by blowing sheets of air against its opposite sides, at a third station along said path flexing the strip by bending it partially around a series of rollers located across said path, and at a next location along said path impacting the surfaces of said strip with an abrasive to remove the scale.
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) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |