US2383969A - Permanent magnet steel - Google Patents
Permanent magnet steel Download PDFInfo
- Publication number
- US2383969A US2383969A US424126A US42412641A US2383969A US 2383969 A US2383969 A US 2383969A US 424126 A US424126 A US 424126A US 42412641 A US42412641 A US 42412641A US 2383969 A US2383969 A US 2383969A
- Authority
- US
- United States
- Prior art keywords
- permanent magnet
- magnet steel
- tungsten
- chromium
- alloy
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
Definitions
- This invention relates to a permanent magnet steel, and more particularly to a permanent magnet steel alloy including among other ingredients tungsten and chromium.
- a typical composition heretofore used in the manufacture of a permanent magnet steel is as follows: a
- This composition produces a steel known commercially as- Remalloy, which has excellent remanence and high coercive strength. As is well known to the art, these are very desirable tungsten and chromium has been used in amounts.
- Iron, cobalt, cobalt steel scrap and ferro manganese may be melted together under a lime slag. Iron ore is then added to oxidize the bath thoroughly until the. carbon content is .03% or less and then the slag is replaced; The charge is then superheated and ferro manganese and term molybdenum are added.
- a typical analysis of the alloy produced in thiamanner is:- 11.84%
- This alloy is readily hot workable and possesses rnerous melts to give an average.
- a permanent magnet steel comprising 11- 13% cobalt, 16-18% molybdenum, .5-1% tungsten, .05-.5% chromium, a maximum of 414% carbon and of .10% silicon, 30-50% manganese. and the rest' iron. 7 2:11 permanent magnet .steel comprising 11.84% cobalt, 16.08% molybdenum, 58% tungsten, .07% chromium. .03% carbon, .0896 silicon, .3596 manganese, and the rest iron.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Hard Magnetic Materials (AREA)
Description
Patented'sept. 4,1945
2,383,969 PERMANENT. MAGNET STEEL David. R. Howerton, Riverside," 11]., assignor to Western Electric Company, Incorporated, New York, N. Y., a corporation of New York No Drawing.
This invention relates to a permanent magnet steel, and more particularly to a permanent magnet steel alloy including among other ingredients tungsten and chromium.
It has been the practice in manufacturing certain types of magnet steels to use an alloy of iron, cobalt, and molybdenum and small amounts of carbon, manganese and silicon. Although this composition produces an alloy of suitable magnetic qualities, the alloy has a relatively low impact strength. It certain uses this feature constitutes a distinct disadvantage. v
It is the object of the present invention to provide a permanent magnet alloy having good impact strength.
A typical composition heretofore used in the manufacture of a permanent magnet steel is as follows: a
Per cent Iron 70.5 Cobalt 12.0 Molybdenum n u" 17.0 Carbon .04 Manganese .35 Silicon .10
liiaximum. V
This composition produces a steel known commercially as- Remalloy, which has excellent remanence and high coercive strength. As is well known to the art, these are very desirable tungsten and chromium has been used in amounts.
up to 25% of the charge as a source of both the chromium and the tungsten with satisfactory results. The exact proportion that may be used depends on the amount of tungsten and chromium in the scrap cobalt steel. Other ingredients of the charge are introduced in conventional manner.
Iron, cobalt, cobalt steel scrap and ferro manganese may be melted together under a lime slag. Iron ore is then added to oxidize the bath thoroughly until the. carbon content is .03% or less and then the slag is replaced; The charge is then superheated and ferro manganese and term molybdenum are added. A typical analysis of the alloy produced in thiamanner is:- 11.84%
Application December '23, 1941, Serial No. 424,126
2 Claims. (01. 75-126) cobalt, 16.08% molybdenum, 58% tungsten, .07% chromium, .03% carbon, 10% silicon, 35% manganese, and the rest iron.
. This alloy is readily hot workable and possesses rnerous melts to give an average.
"alloy bars which did not contain tungsten or chromium showed an average dropping distance, required to break the bars of 9.3 divisions on the above scale, while the dropping distance with bars containing chromium and tungsten "averaged 15.25 divisions, which is clearly a very substantial improvement.
In practice, it has been found that the essential I composition of this alloy may be varied somewhat, as follows, without substantially affecting the final product:
'tion and that many changes may be made therein .without departing from the spirit or scope of the invention.
What "is claimed is:
- 1. A permanent magnet steel comprising 11- 13% cobalt, 16-18% molybdenum, .5-1% tungsten, .05-.5% chromium, a maximum of 414% carbon and of .10% silicon, 30-50% manganese. and the rest' iron. 7 2:11 permanent magnet .steel comprising 11.84% cobalt, 16.08% molybdenum, 58% tungsten, .07% chromium. .03% carbon, .0896 silicon, .3596 manganese, and the rest iron.
nsvm a. aowra'mn.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US424126A US2383969A (en) | 1941-12-23 | 1941-12-23 | Permanent magnet steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US424126A US2383969A (en) | 1941-12-23 | 1941-12-23 | Permanent magnet steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2383969A true US2383969A (en) | 1945-09-04 |
Family
ID=23681547
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US424126A Expired - Lifetime US2383969A (en) | 1941-12-23 | 1941-12-23 | Permanent magnet steel |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2383969A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2888344A (en) * | 1955-03-21 | 1959-05-26 | Noren Tore Mans Ivan | Hard facing weld metal deposits |
| US3485620A (en) * | 1966-09-07 | 1969-12-23 | Int Nickel Co | Ultra hard cobalt-molybdenum-iron alloys |
| US4251599A (en) * | 1979-08-23 | 1981-02-17 | Ramsey Corporation | Ferrous metal body coated with an alloy formed by an iron/silicon extended molybdenum plasma spray powder |
| DE3031583A1 (en) * | 1980-08-21 | 1982-02-25 | Ramsey Corp., Manchester, Mo. | Plasma spray powder coated piston rings - with coating of iron, molybdenum and silicon |
| US10857432B2 (en) * | 2017-05-15 | 2020-12-08 | Neo-Sync Llc | Putter head |
-
1941
- 1941-12-23 US US424126A patent/US2383969A/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2888344A (en) * | 1955-03-21 | 1959-05-26 | Noren Tore Mans Ivan | Hard facing weld metal deposits |
| US3485620A (en) * | 1966-09-07 | 1969-12-23 | Int Nickel Co | Ultra hard cobalt-molybdenum-iron alloys |
| US4251599A (en) * | 1979-08-23 | 1981-02-17 | Ramsey Corporation | Ferrous metal body coated with an alloy formed by an iron/silicon extended molybdenum plasma spray powder |
| DE3031583A1 (en) * | 1980-08-21 | 1982-02-25 | Ramsey Corp., Manchester, Mo. | Plasma spray powder coated piston rings - with coating of iron, molybdenum and silicon |
| US10857432B2 (en) * | 2017-05-15 | 2020-12-08 | Neo-Sync Llc | Putter head |
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