US3619174A
Expired / Lapsed
US
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Method for controlling the carbon content in and/or the temperature of the steel
Assignee: Nippon Steel Corp
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Filing: 1969-06-06
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Granted: 1971-11-09
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Expires: 1989-06-06
Abstract
Abstract On the basis the experimental data, constants are predetermined to establish the decarburizing rate of a ferrous metal bath in a refining vessel in three successive oxygen blowing periods constituting the refining cycle. The model provided by the three equations determining the decarburizing rates is then used to control the refining time so as to obtain a steel of the desired carbon content from the charge of a given carbon content.
Inventors
- 👤 Takehiko Fujii
- 👤 Taiji Araki
- 👤 Katsukiyo Marukawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:49
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/28; C21C5/30
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
29 words
The method of claim 1, wherein the time tP of sampling the carbon content CP is the start of the oxygen blowing whereby tP becomes zero in said equations.
References Cited (Backward Citations)
US3181343A
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US3329495A
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US3463631A
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US3372023A
Cited
US3377158A
Cited
US3432288A
Cited
US3455164A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |