US3681972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and device for determining the oxygen concentration in metal melts
Assignee: SALZGITTER HUETTENWERK AG
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Filing: 1970-06-08
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Granted: 1972-08-08
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Expires: 1990-06-08
Abstract
Abstract The oxygen concentration in a metal melt, such as a steel melt, is determined by comparing the melting point temperature of a sample taken from the melt with the melting point temperature of the same metal but without any free oxygen, other impurities being taken into account. The difference is related to the oxygen concentration. This is preferably done by taking two samples from the melt, fixing the free oxygen in one of them by a reducing agent and determining the difference between the melting point temperatures of the treated and untreated samples.
Inventors
- 👤 Bhaskar Chandra Mahanty
- 👤 Gustav Mahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:14
CPC Classifications
G; G01; G01N; G01N25/00; G01N25/02; G01N25/04; G01N25/06; G01N33/00; G01N33/20; G01N33/202; G01N33/2022; G01N33/2025; G01N33/205; Y; Y10; Y10S; Y10S73/00; Y10S73/09; Y10T; Y10T436/00; Y10T436/20; Y10T436/207497; Y10T436/209163
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
33 words
A process as set forth in claim 1, wherein a slight excess of said reducing agent is used over the amount which is necessary to fix the free oxygen in said second sample.
Claim 2
Dependent Claim
21 words
A process as set forth in claim 1, wherein said metal melt is steel and said reducing agent used is aluminum.
Claim 3
Dependent Claim
93 words
A process as set forth in claim 1, including the step of analyzing and determining the quantities of impurities other than oxygen in said metal melt to obtain the amount by which said impurities reduce the melting point temperature of said metal, and wherein said melting point temperature of said sample is compared with the Melting point temperature of said metal in its pure state minus the decrease in temperature due to said impurities, the difference between said two melting point temperatures being directly related to said oxygen concentration in said metal melt.
Claim 4
Independent Claim
114 words
A device for determining the oxygen concentration in metal melts comprising a sampling lance having an upper end, and a lower end adapted for dipping into a metal melt, a pair of measuring pans mounted on said lower end of said sampling lance, said pans being adapted to receive samples from the metal melts, one of said pans containing reducing means for its metal melt sample, a pair of thermocouple measuring elements located one in each of said measuring pans, conductors from said thermocouple elements leading to said upper end of said sampling lance, means for determining the temperatures measured by said thermocouple elements, and means connecting said conductors to said temperature determining means.
Claim 5
Dependent Claim
32 words
A device as set forth in claim 5, wherein said sampling lance is provided with a longitudinal drilling extending between said upper and lower ends and said conductors pass through said drilling.
Claim 6
Dependent Claim
35 words
A device as set forth in claim 5, further including means for computing the difference between the temperatures measured by said thermocouple elements and said temperature determining means, said computing means having an indicator device.
References Cited (Backward Citations)
US2303265A
Cited
US3403090A
Cited
US3463005A
Cited
US3503259A
Cited
US3574598A
Cited
US3559452A
Cited
US3481201A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |