US5344509A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for prevent the formation of adhesives when annealing steel band
Assignee: Messer Griesheim GmbH
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Filing: 1993-02-23
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Granted: 1994-09-06
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Expires: 2013-02-23
Abstract
Abstract A process to prevent the formation of adhesives when annealing a steel band having a low carbon content uses an inert gas consisting of nitrogen and hydrogen and includes the phases of heating up, holding time and cooling. The process is characterized in that during the holding time, the steel band is coated by oxidation with a thin coating which is then completely removed by reduction during the cooling phase.
Inventors
- 👤 Peter Zylla
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:25
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/74; C21D1/76; C21D1/68; C21D1/70; C21D9/00; C21D9/52; C21D9/54; C21D9/663; C21D9/667; C21D9/67; C21D9/56; C21D9/561; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/122
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
123 words
Process to prevent adhesion during the annealing of steel billets having a low content of carbon in an inert gas atmosphere consisting of 95% to 99% nitrogen and the rest of hydrogen; the process including sequentially heating up, maintaining and cooling off phases, the improvement being in that during the maintaining phase the steel billet is coated in a coating step with a thin covering layer by means of oxidation at temperatures above 600° C. [1112° F.], during the coating step 0.2 to 0.3 grams of CO 2 are added to the inert gas per square meter of the surface of annealing material, and completely removing the covering layer through reduction during the cooling off phase at temperatures below 600° C. [1112° F.].
Claim 2
Dependent Claim
123 words
Process to prevent adhesion during the annealing of steel billets having a low content of carbon in an inert gas atmosphere consisting of 95% to 99% nitrogen and the rest of hydrogen; the process including sequentially heating up, maintaining and cooling off phases, the improvement being in that during the maintaining phase the steel billet is coated in a coating step with a thin covering layer by means of oxidation at temperatures above 600° C. [1112° F.], during the coating step 0.2 to 0.3 grams of CO 2 are added to the inert gas per square meter of the surface of annealing material, and completely removing the covering layer through reduction during the cooling off phase at temperatures below 600° C. [1112° F.].
Claim 3
Dependent Claim
23 words
Process according to claim 1, characterized in that the reduction takes place by a change in water equilibrium during the cooling off phase.
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) | 1997-09-05 | 1998-03-07 | 1998-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-09-05 | 2002-03-07 | 2002-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-09-05 | 2006-03-07 | 2006-09-06 | $7700.00 | Window Closed / Lapsed |