US3946794A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing fine diameter wire from steel-titanium melts
Assignee: Monsanto Co
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Filing: 1973-08-29
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Granted: 1976-03-30
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Expires: 1993-08-29
Abstract
Abstract A method is provided for preventing orifice plugging when melt extruding a steel-titanium alloy to form fine diameter wire. This is accomplished by controlling the oxygen potential in the melt above the orifice at a level wherein the activity of titania within the melt is maintained at from 0.3 to unity -- the standard state of unit activity being defined as the melt saturated in titania at the concentrations of titanium and oxygen therein and at the melt temperature.
Inventors
- 👤 Lawrence F. Rakestraw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:41
CPC Classifications
B; B22; B22D; B22D11/00; B22D11/005; B21; B21B; B21B31/00; B21B31/16; B21B31/20; B21B31/203
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
194 words
In a method for producing fine diameter wire from the melt of a steel alloy wherein said melt is extruded through an orifice as a continuous molten stream and into an oxygen-containing atmosphere where a stabilizing film is caused to form about the surface of the stream to preserve its continuity until solidified, the improvement which comprises: a. heating to the melt an alloy comprised of steel and at least 0.2 percent by weight of titanium; b. maintaining a pressurized gas mixture over the melt consisting of an inert gas and an oxygen-containing gas; c. controlling the oxygen potential of the melt by means of said oxygen-containing gas at a level wherein the titania formed in the melt by oxidization of said titanium has an activity of from about 0.3 to unity; d. causing said melt to extrude through an orifice as a continuous molten stream and into an oxygen-containing gaseous atmosphere having the capacity for increasing the oxygen potential of said stream to a level wherein said titania is caused to precipitate and form a stabilizing film about the periphery of said stream; e. cooling said film-stabilized molten stream to the solid state.
Claim 2
Dependent Claim
194 words
In a method for producing fine diameter wire from the melt of a steel alloy wherein said melt is extruded through an orifice as a continuous molten stream and into an oxygen-containing atmosphere where a stabilizing film is caused to form about the surface of the stream to preserve its continuity until solidified, the improvement which comprises: a. heating to the melt an alloy comprised of steel and at least 0.2 percent by weight of titanium; b. maintaining a pressurized gas mixture over the melt consisting of an inert gas and an oxygen-containing gas; c. controlling the oxygen potential of the melt by means of said oxygen-containing gas at a level wherein the titania formed in the melt by oxidization of said titanium has an activity of from about 0.3 to unity; d. causing said melt to extrude through an orifice as a continuous molten stream and into an oxygen-containing gaseous atmosphere having the capacity for increasing the oxygen potential of said stream to a level wherein said titania is caused to precipitate and form a stabilizing film about the periphery of said stream; e. cooling said film-stabilized molten stream to the solid state.
Claim 3
Dependent Claim
31 words
The method of claim 1, wherein said steel-titanium melt contains from about 0.01 to 4.3 percent by weight of carbon and from about 0.2 to 5.0 percent by weight of titanium.
Claim 4
Dependent Claim
33 words
The method of claim 1, wherein said gas mixture over the melt consists of an inert gas and a gas selected from the group consisting of carbon monoxide, carbon dioxide, oxygen and steam.
Claim 5
Dependent Claim
11 words
The method of claim 3, wherein said inert gas is argon.
Claim 6
Dependent Claim
33 words
The method of claim 1, wherein said melt is extruded as a molten stream into a gaseous atmosphere selected from the group consisting of carbon monoxide, carbon dioxide, oxygen, sulfur dioxide and steam.
Claim 7
Dependent Claim
35 words
The method of claim 1, wherein the oxygen containing gas in the gas mixture over the melt is carbon monoxide and the melt is extruded as a molten stream into a carbon monoxide containing atmosphere.
Claim 8
Dependent Claim
25 words
The method of claim 1, wherein the oxygen potential of the melt is controlled to where the activity of titania is from 0.9 to unity.
Claim 9
Dependent Claim
25 words
The method of claim 1, wherein hydrogen or helium are employed as a cooling gas to cool said film-stabilized molten stream to the solid state.
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) | 1979-03-30 | 1979-09-29 | 1980-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-30 | 1983-09-29 | 1984-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-30 | 1987-09-29 | 1988-03-30 | $7700.00 | Window Closed / Lapsed |