US3829538A - Control method and apparatus for the production of powder metal - Google Patents
Control method and apparatus for the production of powder metal Download PDFInfo
- Publication number
- US3829538A US3829538A US00294747A US29474772A US3829538A US 3829538 A US3829538 A US 3829538A US 00294747 A US00294747 A US 00294747A US 29474772 A US29474772 A US 29474772A US 3829538 A US3829538 A US 3829538A
- Authority
- US
- United States
- Prior art keywords
- metal
- electrodes
- electrode
- stream
- liquid metal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/10—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying using centrifugal force
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/0848—Melting process before atomisation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
Definitions
- the present invention relates to a method of control and control apparatus for the production of metallic powder using ingots of pre-alloyed metal as consumable electrodes.
- the grains of the consumable electrode grow inwardly during their solidification and drive the low melting point constituents, elements and compounds along with them, thereby setting up a degree of segregation within the electrodes. This degree of segregation is more prominent in superalloys although troublesome with many other alloys used in powder metallurgy.
- the lack of homogeneous properties. in the liquid metal droplets has been overcome by providing a shallow reservoir for holding a volume of molten metal sufficient to provide a metallurgically homogeneous metal stream which is then delivered to an atomizing station for the production of the metallic powder.
- the control is based on adjustments of the power input to two consumable electrodes to control the melting rate thereof. Concurrently, adjustment is made to the position of the electrodes to maintain an arc gap for continuous melting of the electrode. This can be accomplished, for example, by an arc voltage control system.
- a method of producing pre-alloyed metallic powder comprising the steps of providing at least one electrode having a composition corresponding to the desired metallurgical composition of the powder to be ultimately produced, striking an arc to melt the consumable electrode in a controlled atmosphere and without the formation of any substantial slag, controlling the rate of continuous melting of the consumable electrode by power input adjustments on the basis of a desired flow rate of the molten metal to the atomization means, collecting the molten metal in a reservoir, holding the mo]- ten metal in the reservoir for a period of time sufficient to homogenize it, atomizing the homogenized metal passing from the reservoir, and cooling the atomized metal in a chamber having a controlled atmosphere.
- the method according to the present invention additionally provides the step of adjusting the arc gap between the electrodes to maintain desired arc conditions therebetween for continuous melting of the consumable electrode.
- An important feature of the invention is to provide a system for controlling the melting rate in a consumable electrode melting process wherein the melting rate is very accurately controlled and adjusted to match a predetermined flow rate of the molten metal supply to the atomization means by adjustments of the power inputs to the consumable electrodes.
- An electrode gap adjustment circuit based on arc voltage or the like, may be concurrently operated to maintain the gap between electrodes at a desired dimension to provide a continuous delivery of liquid metal droplets from the consumable electrode.
- FIG. 1 is a schematic view of one embodiment of the melting means of the powder making system of the present invention
- FIG. 2 is a schematic view of another embodiment of the melting means of the powder making system of the invention.
- FIG. 3 is a schematic view of the preferred embodiment of the invention including the preferred melting means, atomization means and powder collecting means.
- a tundish 10 having a heating source (e.g., an induction coil 11) for preheating the tundish to prevent premature freezing of liquid metal passing into it from consumable electrode 52 and fluid cooled non-consumable stool 54.
- the tundish also includes a skimmer wall 14 to prevent the outflow of impurities which may be floating on the metal surface in the tundish. Molten metal passes from'the tundish through a runner channel 15 to the atomization apparatus, which in the embodiment shown (FIG. 3) is a rotating drum (hereinafter discussed).
- this electrode is formed from an ingot of prealloyed metal corresponding in composition to that of the ultimate powder to be produced.
- a non-consumable fluid cooled stool 54 In this embodiment, the electrode and stool are connected by transmission lines and 31, respectively, to a power supply 32 and potentiometer 33 having a slide wire 34 which is manually set to vary the power delivered from the supply 32 to the electrode and the stool.
- the electrode 52 is contained within an evacuated chamber 51 within which it is supported vertically by means of supp'ort rod assembly 53. This support rod assembly 53 permits adjusting the position of the electrode to strike an are on the non-consumable stool 54.
- a skimmer wall 14 prevents the outflowing of slag or other impurities whichmay float upon the surface of the metal.
- the runner directs the liquid metal to the atomization apparatus.
- FIG. 2 illustrates the same embodiment of FIG. 1, except for a different runner or pouring nozzle 59 which receives molten metal from stool 58 and directs the molten metal to the atomization apparatus.
- Pouring nozzle 59 may be heated by means of the electrical resistance or induction coils 60.
- the use of the stool 54 in the embodiment of FIG. 1 and stool 58 according to the embodiment of FIG. 2 provides an immediate shallow pool area for collecting liquid metal droplets from the electrodes.
- the depth of the pool is selected for optimum temperature of the metal flowing from the stool. This depth is usually less than one-third the diameter of the electrode 52.
- an embodiment which includes two consumable electrodes 12 and 13 in the preferred form. These electrodes are formed from ingots of pre-alloyed metal corresponding in composition to that of the ultimate powder to be continuously produced.
- the electrodes are connected by electrical transmission lines 30 and 31, respectively, to a polarity reversing switch 71 and through other electrical transmission lines 73 and 74, respectively, to power supply 32.
- a potentiometer 33 having a slide wire 34 is manually set to vary the power delivered from the supply 32 to the electrodes.
- a sight glass 35 1 is provided in the housing for viewing the arc gap between the electrodes which are adjusted to continually maintain a predetermined arc gap by hydraulic drives 36 and 37.
- Lines 38a and 38b connect the hydraulic drives to a servo system which is controlled by an electrode position control 39 through the lines 40a and 46b. Electrodes l2 and 13 are oscillated at least about 180 in opposite directions by means of motors 69 and 70. Oscillation speed is controlled through a timer, not
- the apparatus is placed in operation by adjusting the relative position of the consumable electrodes 12 and 13 through the operation of hydraulic drives 36 and 37 to obtain proper spacing for striking an electric arc.
- Current passes through the lines 30 and 31 in order to strike an arc and melt the electrodes.
- Proper spacing and centering of the electrodes is maintained by the electrode position control 39 as the electrodes are continuously consumed.
- the electrodes 12 and 13 are continually oscillated by means of motors 69 and 70 to insure uniform burn-off across the opposing faces of the electrodes during the melting process. The character of the arc is observed through the sight ports 35.
- the polarities of the electrodes are preferably changed periodically by means of polarity reversing switch 71.
- Mo]- ten metal from the electrodes is collected to form a pool of liquid metal and homogenize it in tundish 10, which may be similar to that described in the embodiment of FIG. 1.
- the metal from tundish 10 flows under skimmer 14 and through nozzle 15 onto the atomizing wheel or drum 16. The remainder of the process is identical with that described in the embodiment of FIG.
- the metal discharged by the runner channel 15 in a continuous and controlled flow impinges upon the outer surface of a drum 16 having bearing mounted shafts 16a extending horizontally and connected to a drive motor 1612. It is preferred to form the peripheral surface of the drum with projecting teeth or vanes which are water cooled and which may be replaceable.
- the stream of liquid metal impinges upon the surface of the drum, it is atomized into a spray of liquid metal which passes through a movable shield 17 into a chamber 18 where the metal solidifies into a powdered form that is collected on a transfer surface of a vibrator conveyor 19.
- the chamber 18 as well as the space surrounding electrodes 12 and 13 and tundish 10 is evacuated or otherwise provided with a controlled non-oxidizing atmosphere.
- the temperature of the powdered metal on the conveyor must fall below a temperature at which there occurs a latent heat of fusion and superheat of the solidified metal so as to avoid impairing the quality and particle size of the metal powder. This is accomplished by controlling the supply and flow of liquid metal through potentiometer 33 as aforesaid, entering the holding chamber II.
- a sight glass 21 is provided in the end wall of the chamber for viewing the stream of metal discharged from the runner 15 onto the peripheral surface of the drum 16.
- the volume of liquid metal entering the holding chamber may be adjusted and controlled according to the stream of metal flowing from the runner 15 and to coincide with the optimum atomization rate for the equipment used.
- a disc may be used which is arranged for receiving a stream of metal on its upper horizontal surface and atomizing it.
- a plasma gun may be used to atomize the liquid metal or an. argon nozzle may be used.
- the electrodes and the atomization means are in a vacuum or in a controlled nonoxidizing atmosphere.
- a method of producing pre-alloyed metal powder with atomization means comprising the steps of,
- the method of claim 2 including the step of rotating at least one of said electrodes about its axis to insure uniform burn-off during the melting process.
- An apparatus for producing pre-alloyed metal powder comprising,
- first and second electrodes forming a gap within said enclosed chamber for striking an arc therein, at least one of said electrodes being an ingot of prealloyed metal corresponding to the composition of the pre-alloyed metal powder to be ultimately formed,
- a power supply connected to said electrodes to melt the electrode of pre-alloyed metal without the formation of any substantial slag
- electrode position control means including a drive for adjusting said gap to maintain an are between said electrodes
- a liquid metal holding chamber in said enclosed chamber for collecting and homogenizing the mo]- ten pre-alloyed metal from at least one of said electrodes, said holding chamber providing a continuous stream of said homogenized molten pre-alloyed metal,
- said means for adjusting the power comprises a manually adjustable rheostat.
- said electrode position control means receives a signal proportional to the power delivered from said supply to said electrodes to maintain continuous melting thereof.
Abstract
Description
Claims (11)
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00294747A US3829538A (en) | 1972-10-03 | 1972-10-03 | Control method and apparatus for the production of powder metal |
GB4599573A GB1393185A (en) | 1972-10-03 | 1973-10-02 | Control method and apparatus for the production of pwder metal |
DE2349742A DE2349742C2 (en) | 1972-10-03 | 1973-10-03 | Process for the production of pre-alloyed metal powder |
JP48110640A JPS4993257A (en) | 1972-10-03 | 1973-10-03 | |
FR7335394A FR2201148B1 (en) | 1972-10-03 | 1973-10-03 | |
CA182,591A CA1006317A (en) | 1972-10-03 | 1973-10-03 | Control method and apparatus for the production of powder metal |
SE7313485A SE399190B (en) | 1972-10-03 | 1973-10-03 | PROCEDURE AND DEVICE FOR THE PRODUCTION OF ALLOYED METAL POWDER |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00294747A US3829538A (en) | 1972-10-03 | 1972-10-03 | Control method and apparatus for the production of powder metal |
Publications (1)
Publication Number | Publication Date |
---|---|
US3829538A true US3829538A (en) | 1974-08-13 |
Family
ID=23134763
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00294747A Expired - Lifetime US3829538A (en) | 1972-10-03 | 1972-10-03 | Control method and apparatus for the production of powder metal |
Country Status (7)
Country | Link |
---|---|
US (1) | US3829538A (en) |
JP (1) | JPS4993257A (en) |
CA (1) | CA1006317A (en) |
DE (1) | DE2349742C2 (en) |
FR (1) | FR2201148B1 (en) |
GB (1) | GB1393185A (en) |
SE (1) | SE399190B (en) |
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4036568A (en) * | 1973-12-07 | 1977-07-19 | Creusot-Loire | Machines for manufacture of powders |
US4127158A (en) * | 1973-10-15 | 1978-11-28 | Toyo Kohan Co., Ltd. | Process for preparing hollow metallic bodies |
US4295808A (en) * | 1975-06-28 | 1981-10-20 | Leybold-Heraeus Gmbh & Co. Kg | Apparatus for the production of high-purity metal powder by means of electron beam heating |
US4358415A (en) * | 1979-01-09 | 1982-11-09 | Ishikawajima-Harima Jukogyo Kabushiki Kaisha | Method for producing granules from molten metallurgical slags |
US4373883A (en) * | 1979-01-09 | 1983-02-15 | Ishikawajima-Harima Jukogyo Kabushiki Kaisha | Apparatus for producing granules from molten metallurgical slags |
US4474604A (en) * | 1982-04-30 | 1984-10-02 | Hitachi Metals, Ltd. | Method of producing high-grade metal or alloy powder |
EP0134808A1 (en) * | 1983-01-24 | 1985-03-27 | Gte Prod Corp | Method for making ultrafine metal powder. |
US4582116A (en) * | 1980-12-29 | 1986-04-15 | Allied Corporation | Extraction method for filament formation of high temperature reactive alloys |
US4592781A (en) * | 1983-01-24 | 1986-06-03 | Gte Products Corporation | Method for making ultrafine metal powder |
US4731517A (en) * | 1986-03-13 | 1988-03-15 | Cheney Richard F | Powder atomizing methods and apparatus |
US4886547A (en) * | 1986-09-19 | 1989-12-12 | Nippon Kokan Kabushiki Kaisha | Powder manufacturing apparatus and method therefor |
US5272718A (en) * | 1990-04-09 | 1993-12-21 | Leybold Aktiengesellschaft | Method and apparatus for forming a stream of molten material |
US5284329A (en) * | 1991-01-25 | 1994-02-08 | Leybold Alktiengesellschaft | System for the production of powders from metals |
US5372224A (en) * | 1992-02-07 | 1994-12-13 | Fichtel & Sachs Ag | Oscillation damper |
US5708677A (en) * | 1995-04-21 | 1998-01-13 | Sandia Corporation | Arc voltage distribution skewness as an indicator of electrode gap during vacuum arc remelting |
US20030230554A1 (en) * | 2002-06-12 | 2003-12-18 | Nanotechnologies, Inc. | Radial pulsed arc discharge gun for synthesizing nanopowders |
CN110961646A (en) * | 2019-11-07 | 2020-04-07 | 深圳航科新材料有限公司 | Metal powder and method for producing same |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3144481A1 (en) * | 1981-11-09 | 1983-05-19 | Holm 4600 Dortmund Krüger | Method and apparatus for producing blasting abrasives with temperature- and grain size-controlled solidification |
DE3211861A1 (en) * | 1982-03-31 | 1983-10-06 | Leybold Heraeus Gmbh & Co Kg | METHOD AND DEVICE FOR PRODUCING HIGH-PURITY CERAMIC-FREE METAL POWDERS |
GB2142046B (en) * | 1983-06-23 | 1987-01-07 | Gen Electric | Method and apparatus for making alloy powder |
JPS6070110A (en) * | 1983-09-27 | 1985-04-20 | Ishikawajima Harima Heavy Ind Co Ltd | Apparatus for producing spherical metallic powder |
JPS6152308A (en) * | 1984-08-17 | 1986-03-15 | Ishikawajima Harima Heavy Ind Co Ltd | Production of metallic powder |
JPS6143230U (en) * | 1984-08-17 | 1986-03-20 | 石川島播磨重工業株式会社 | Metal powder manufacturing equipment |
JPS61223109A (en) * | 1985-03-28 | 1986-10-03 | Dia Shinku Giken Kk | Method and apparatus for producing ultrafine particle |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2189387A (en) * | 1938-03-05 | 1940-02-06 | Haynes Stellite Co | Method of making hard compositions |
US2310635A (en) * | 1941-09-27 | 1943-02-09 | Kellogg M W Co | Metal fusing apparatus |
US2897539A (en) * | 1957-03-25 | 1959-08-04 | Titanium Metals Corp | Disintegrating refractory metals |
US3021562A (en) * | 1957-04-01 | 1962-02-20 | Dow Chemical Co | Production of group iv, subgroup a, metal prills |
GB972305A (en) * | 1960-06-13 | 1964-10-14 | Schloemann Ag | Continuous system for fabricating metal products |
US3099041A (en) * | 1961-03-08 | 1963-07-30 | Nuclear Metals Inc | Method and apparatus for making powder |
DE2012213C3 (en) * | 1970-03-14 | 1975-03-27 | Leybold-Heraeus Gmbh & Co Kg, 5000 Koeln | Method and device for the production of pellets by means of charge carrier beams |
GB1353517A (en) * | 1970-07-17 | 1974-05-22 | Whittaker Corp | Production of pure spherical powders |
US3646175A (en) * | 1970-09-21 | 1972-02-29 | Rmi Co | Method and apparatus for converting miscellaneous pieces of reactive metals to a usable form |
GB1322986A (en) * | 1970-12-04 | 1973-07-11 | Atomic Energy Authority Uk | Finely divided metals |
-
1972
- 1972-10-03 US US00294747A patent/US3829538A/en not_active Expired - Lifetime
-
1973
- 1973-10-02 GB GB4599573A patent/GB1393185A/en not_active Expired
- 1973-10-03 CA CA182,591A patent/CA1006317A/en not_active Expired
- 1973-10-03 JP JP48110640A patent/JPS4993257A/ja active Pending
- 1973-10-03 FR FR7335394A patent/FR2201148B1/fr not_active Expired
- 1973-10-03 SE SE7313485A patent/SE399190B/en unknown
- 1973-10-03 DE DE2349742A patent/DE2349742C2/en not_active Expired
Cited By (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4127158A (en) * | 1973-10-15 | 1978-11-28 | Toyo Kohan Co., Ltd. | Process for preparing hollow metallic bodies |
US4036568A (en) * | 1973-12-07 | 1977-07-19 | Creusot-Loire | Machines for manufacture of powders |
US4295808A (en) * | 1975-06-28 | 1981-10-20 | Leybold-Heraeus Gmbh & Co. Kg | Apparatus for the production of high-purity metal powder by means of electron beam heating |
US4358415A (en) * | 1979-01-09 | 1982-11-09 | Ishikawajima-Harima Jukogyo Kabushiki Kaisha | Method for producing granules from molten metallurgical slags |
US4373883A (en) * | 1979-01-09 | 1983-02-15 | Ishikawajima-Harima Jukogyo Kabushiki Kaisha | Apparatus for producing granules from molten metallurgical slags |
US4582116A (en) * | 1980-12-29 | 1986-04-15 | Allied Corporation | Extraction method for filament formation of high temperature reactive alloys |
US4474604A (en) * | 1982-04-30 | 1984-10-02 | Hitachi Metals, Ltd. | Method of producing high-grade metal or alloy powder |
EP0134808B1 (en) * | 1983-01-24 | 1990-09-12 | Gte Products Corporation | Method for making ultrafine metal powder |
EP0134808A1 (en) * | 1983-01-24 | 1985-03-27 | Gte Prod Corp | Method for making ultrafine metal powder. |
US4592781A (en) * | 1983-01-24 | 1986-06-03 | Gte Products Corporation | Method for making ultrafine metal powder |
US4731517A (en) * | 1986-03-13 | 1988-03-15 | Cheney Richard F | Powder atomizing methods and apparatus |
US4886547A (en) * | 1986-09-19 | 1989-12-12 | Nippon Kokan Kabushiki Kaisha | Powder manufacturing apparatus and method therefor |
US5272718A (en) * | 1990-04-09 | 1993-12-21 | Leybold Aktiengesellschaft | Method and apparatus for forming a stream of molten material |
US5284329A (en) * | 1991-01-25 | 1994-02-08 | Leybold Alktiengesellschaft | System for the production of powders from metals |
DE4102101C2 (en) * | 1991-01-25 | 2003-12-18 | Ald Vacuum Techn Ag | Device for producing powders from metals |
US5372224A (en) * | 1992-02-07 | 1994-12-13 | Fichtel & Sachs Ag | Oscillation damper |
US5708677A (en) * | 1995-04-21 | 1998-01-13 | Sandia Corporation | Arc voltage distribution skewness as an indicator of electrode gap during vacuum arc remelting |
US20030230554A1 (en) * | 2002-06-12 | 2003-12-18 | Nanotechnologies, Inc. | Radial pulsed arc discharge gun for synthesizing nanopowders |
US6777639B2 (en) * | 2002-06-12 | 2004-08-17 | Nanotechnologies, Inc. | Radial pulsed arc discharge gun for synthesizing nanopowders |
US20050000950A1 (en) * | 2002-06-12 | 2005-01-06 | Nanotechnologies, Inc. | Radial pulsed arc discharge gun for synthesizing nanopowders |
US7126081B2 (en) | 2002-06-12 | 2006-10-24 | Nanotechnologies, Inc. | Radial pulsed arc discharge gun for synthesizing nanopowders |
CN110961646A (en) * | 2019-11-07 | 2020-04-07 | 深圳航科新材料有限公司 | Metal powder and method for producing same |
CN110961646B (en) * | 2019-11-07 | 2023-08-04 | 深圳航科新材料有限公司 | Metal powder and method for producing the same |
Also Published As
Publication number | Publication date |
---|---|
CA1006317A (en) | 1977-03-08 |
DE2349742A1 (en) | 1974-04-11 |
SE399190B (en) | 1978-02-06 |
JPS4993257A (en) | 1974-09-05 |
DE2349742C2 (en) | 1984-02-02 |
GB1393185A (en) | 1975-05-07 |
FR2201148A1 (en) | 1974-04-26 |
FR2201148B1 (en) | 1979-10-19 |
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Legal Events
Date | Code | Title | Description |
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AS | Assignment |
Owner name: CITICORP INDUSTRIAL CREDIT, INC., BOND COURT BLDG. Free format text: SECURITY INTEREST;ASSIGNOR:SPECIAL METALS CORPORATION;REEL/FRAME:004207/0501 Effective date: 19831223 Owner name: AL-INDUSTRIAL PRODUCTS, INC. 2700 TWO OLIVER PLAZA Free format text: SECURITY INTEREST;ASSIGNOR:SPECIAL METALS CORPORATION A DE CORP;REEL/FRAME:004212/0061 Effective date: 19831229 |
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Owner name: ALLEGHENY INTERNATIONAL ACCEPTANCE CORPORATION Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:AL- INDUSTRIAL PRODUCTS INC.;REEL/FRAME:004379/0797 Effective date: 19850306 |
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Owner name: HELLER FINANCIAL, INC., 101 PARK AVE., NEW YORK, N Free format text: SECURITY INTEREST;ASSIGNOR:SPECIAL METALS CORPORATION;REEL/FRAME:004756/0171 Effective date: 19870827 |
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AS | Assignment |
Owner name: SPECIAL METALS CORPORATION Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:CITICORP INDUSTRIAL CREDIT, INC.;REEL/FRAME:004764/0322 Effective date: 19870825 |
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AS | Assignment |
Owner name: SPECIAL METALS CORPORATION, 240 TWO CHATHAM CENTER Free format text: RELEASED BY SECURED PARTY;ASSIGNORS:AL-INDUSTRIAL PRODUCTS, INC., A CORP. OF PA;ALLEGHENY INTERNATIONAL, INC., A CORP. OF PA;REEL/FRAME:004846/0078 Effective date: 19870827 Owner name: SPECIAL METALS CORPORATION,PENNSYLVANIA Free format text: RELEASED BY SECURED PARTY;ASSIGNORS:AL-INDUSTRIAL PRODUCTS, INC., A CORP. OF PA;ALLEGHENY INTERNATIONAL, INC., A CORP. OF PA;REEL/FRAME:004846/0078 Effective date: 19870827 |
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AS | Assignment |
Owner name: SPECIAL METALS CORPORATION, NEW YORK Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:HELLER FINANCIAL, INC.;REEL/FRAME:005463/0096 Effective date: 19900831 |
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