US4124515A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Casting powder
Assignee: Vodafone GmbH
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Filing: 1974-10-03
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Granted: 1978-11-07
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Expires: 1994-10-03
Abstract
Abstract A casting powder for steel having, for example, ground blast furnace slag, and/or sand and caustic lime CaF 2 as basic substances with further additives which include up to 10% of additives decomposing completely at temperatures below 600° C under development of gas whereby the mole-volume of developed gas per mole-weight gas-generating additive (m 3 /Kg) is not smaller than 0.5. Ammonium nitrite or ammonium carbonate is preferred whereby the gaseous decomposition products will be nitrogen, water vapor and/or carbon dioxide.
Inventors
- 👤 Hans Gruner
- 👤 Hans Schrewe
- 👤 Erich Keuper
- 👤 Fritz-Peter Pleschhutschnigg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:07
CPC Classifications
B; B22; B22D; B22D11/00; B22D11/10; B22D11/11; B22D11/111
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
70 words
In a method of continuous casting of steel, the use of a casting powder for application to the molten steel, the powder being free from uncombined carbon but including carbonates or nitrites as additives which decompose completely at a temperature of not more than 600° C. under atmospheric pressure under development of gas pursuant to the decompositioning, for generating a gas barrier against the influx of oxygen into the steel.
Claim 2
Dependent Claim
70 words
In a method of continuous casting of steel, the use of a casting powder for application to the molten steel, the powder being free from uncombined carbon but including carbonates or nitrites as additives which decompose completely at a temperature of not more than 600° C. under atmospheric pressure under development of gas pursuant to the decompositioning, for generating a gas barrier against the influx of oxygen into the steel.
Claim 3
Dependent Claim
33 words
Method as in claim 1, using a powder, wherein the additives have a specific gas generation constant in ecxess of 0.5 defined as cubic meter developed gas per mole kilogram gas generating substance.
Claim 4
Dependent Claim
18 words
Method as in claim 1 wherein the additives used include NH 4 · (CO 2 NH 2 ).
Claim 5
Dependent Claim
12 words
Method as in claim 1, wherein the additives used include ammonium nitrites.
Claim 6
Dependent Claim
27 words
Method as in claim 1, wherein at least one additive act as a catalyst which provides for catalytic decompositioning of the additive which releases gas upon decompositioning.
Claim 7
Dependent Claim
13 words
Method as in claim 5, wherein the catalyst is itself a gas generator.
Claim 8
Dependent Claim
16 words
Method as in claim 5, wherein 0.1 to 10% of the powder is such a catalyst.
Claim 9
Dependent Claim
21 words
Method as in claim 2, wherein the additives used are 0.5 to 10% by weight of the total casting powder composition.
Claim 10
Dependent Claim
17 words
Method as in claim 1, wherein the additives used include (NH 4 ) 2 CO 3 .
Claim 11
Dependent Claim
11 words
Method as in claim 1, wherein the additives used include ironcarbonyl.
References Cited (Backward Citations)
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Cited
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US3254380A
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US3874885A
Cited
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Cited
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Cited
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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) | 1981-11-06 | 1982-05-08 | 1982-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-06 | 1986-05-08 | 1986-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-06 | 1990-05-08 | 1990-11-07 | $7700.00 | Window Closed / Lapsed |