US3735966A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for heat treating steel wire rod
Assignee: Schloemann AG
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Filing: 1971-06-07
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Granted: 1973-05-29
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Expires: 1991-06-07
Abstract
Abstract Patenting hot-rolled rod with alternate quenching and heat compensation stages before transformation; the quenching stations decrease logarithmically and the compensation stages increase logarithmically; the surface of the rod reaches is cooled down to below about 400*C, and the rod begins to transform in the pearlite zone before full temperature equalisation, the rod being reeled when a substantial peripheral zone of the rod has been predominantly transformed to pearlite.
Inventors
- 👤 B Hoffmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:08
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/52; C21D9/54; C21D9/56; C21D9/573; C21D9/5732; B; B21; B21C; B21C47/00; B21C47/26; B21C47/262; C21D1/00; C21D1/62; C21D1/84
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
135 words
Apparatus for heat treating hot, patentable steel rod whose temperature is initially above the A3 transformation point, as the rod issues from the last stand of a rod mill, the apparatus comprising a series of at least three successive water cooling units and at least three successive air cooling units arranged as alternate water and air cooling units through which the rod is adapted to pass, the cooling effect of the water cooling units becoming less in the direction of travel of the rod according to a logarithmic relationship and the air cooling units becoming longer in the direction of travel of the rod according to a logarithmic relationship, the overall length of the cooling units being equal to the product of the rod speed and a time of about 0.6 to about 0.7 seconds.
Claim 2
Dependent Claim
135 words
Apparatus for heat treating hot, patentable steel rod whose temperature is initially above the A3 transformation point, as the rod issues from the last stand of a rod mill, the apparatus comprising a series of at least three successive water cooling units and at least three successive air cooling units arranged as alternate water and air cooling units through which the rod is adapted to pass, the cooling effect of the water cooling units becoming less in the direction of travel of the rod according to a logarithmic relationship and the air cooling units becoming longer in the direction of travel of the rod according to a logarithmic relationship, the overall length of the cooling units being equal to the product of the rod speed and a time of about 0.6 to about 0.7 seconds.
Claim 3
Dependent Claim
26 words
Apparatus as claimed in claim 1, wherein the water cooling units become shorter in the direction of travel of the rod according to a logarithmic relationship.
Claim 4
Dependent Claim
21 words
Apparatus as claimed in claim 1 in combination with a reel, for rolling, heat treating and reeling hot, patentable steel rod.
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) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |