Patent FR2419084A1 successfully refreshed from Google Patents.
Patent US3774353A successfully refreshed from Google Patents.
US3774353A
Expired / Lapsed
US
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Method for partially grinding surface flows of a hot bloom and slab
Assignee: Nippon Steel Corp
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Filing: 1971-06-21
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Granted: 1973-11-27
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Expires: 1991-06-21
Abstract
Abstract A method for partially grinding surface flaws of hot steel slabs including bloom, wherein the hot bloom immediately after being hot-rolled is maintained in the state most suitable for detecting surface flaws therein in the rolling line from a rolling mill to a cooling zone. The surface flaws are detected and the thus detected surface flaws are removed by grinding, while the bloom is hot.
Inventors
- 👤 S Yasunaga
- 👤 T Oniki
- 👤 H Sumitomo
- 👤 E Tanaka
- 👤 O Araki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:24
CPC Classifications
B; B24; B24B; B24B1/00; B21; B21B; B21B38/00; B21B39/00; B21B39/20; B21B45/00; B21B45/02; B21B45/0203; B21B45/0209; B21B45/0215; B21B45/0218; B21B45/04; B21B45/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
89 words
A method of detecting and grinding surface flaws in the surfaces of blooms, including slabs while the blooms are hot, comprising: descaling an oxidized film formed on the bloom immediately after it is discharged from a hot-rolling mill; quenching said bloom to a temperature within the range of from 650* to 1,000*C. in which range the surface flaws are most easily detected; detecting any surface flaws on the surfaces of said bloom; and then partially grinding only those parts of the surfaces of said bloom having the detected flaws.
Claim 2
Independent Claim
89 words
A method of detecting and grinding surface flaws in the surfaces of blooms, including slabs while the blooms are hot, comprising: descaling an oxidized film formed on the bloom immediately after it is discharged from a hot-rolling mill; quenching said bloom to a temperature within the range of from 650* to 1,000*C. in which range the surface flaws are most easily detected; detecting any surface flaws on the surfaces of said bloom; and then partially grinding only those parts of the surfaces of said bloom having the detected flaws.
Claim 3
Dependent Claim
35 words
The method claimed in claim 1, wherein the descaling and quenching of said bloom are conducted simultaneously by spraying water onto the surfaces of said bloom immediately after it is discharged from the hot-rolling mill.
Claim 4
Dependent Claim
19 words
The method claimed in claim 1, wherein the descaling and quenching are performed by spraying steam onto said bloom.
Claim 5
Dependent Claim
17 words
The method claimed in claim 1, wherein the quenching is performed by leaving said bloom in air.
Claim 6
Dependent Claim
35 words
The method claim in claim 1, wherein said surface flaws are detected by determining a difference in degree of luminescence between parts of said surfaces having flaws and parts of said surfaces having no flaws.
Claim 7
Dependent Claim
16 words
The method claimed in claim 5 wherein said difference in degree of luminescence is determined visually.
References Cited (Backward Citations)
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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) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |