US1338133A - Magnet-steel - Google Patents
Magnet-steel Download PDFInfo
- Publication number
- US1338133A US1338133A US197838A US19783817A US1338133A US 1338133 A US1338133 A US 1338133A US 197838 A US197838 A US 197838A US 19783817 A US19783817 A US 19783817A US 1338133 A US1338133 A US 1338133A
- Authority
- US
- United States
- Prior art keywords
- magnet
- steel
- magnets
- chromium
- japan
- 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
Links
- 229910000831 Steel Inorganic materials 0.000 title description 7
- 239000010959 steel Substances 0.000 title description 7
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 6
- 239000011651 chromium Substances 0.000 description 6
- 229910000851 Alloy steel Inorganic materials 0.000 description 5
- 229910052804 chromium Inorganic materials 0.000 description 5
- 239000010941 cobalt Substances 0.000 description 5
- 229910017052 cobalt Inorganic materials 0.000 description 5
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 5
- 238000010791 quenching Methods 0.000 description 4
- 230000000171 quenching effect Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000005291 magnetic effect Effects 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000005298 paramagnetic effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
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
- KOTARO HONDA OF YO NEGA-FUKURO, SENDAI, JAPAN, ASSIGNOR TO SUMITOMO CHUKOSHO, LTD, OF OSAKA, JAPAN, A CORPORATION OF JAPAN.
- This invention relates to novel magnet steels and to magnets made therefrom. More particularly, the invention relates to the manufacture of permanent magnets from alloys comprising carbon steel, cobalt,
- Magnets made in accordance with the invention materially excel magnets heretofore known especially in point of strong residual. magnetism and large coercive force.
- metal chromium itself is an essential ingredient of the alloy steel employed.
- a magnet embodying the principles of the invention may be made of an alloy steel having the following ralge of composition:
- bon steel (with.O.5-2% carbon,) the remainder.
- cobalt content is from 20 to and 35% has been found particularly suitable.
- Other elements commonly present in steel may also be present in the alloy, and vanadium or the like may also be added.
- the shaped body of paramagnetic metallic material is. strongly magnetized with the aid of a powerful magnet or coil.
- the magnet produced in the manner described is far superior to magnets heretofore known in the art, particularly as regardsi (1) Coercive force which in magnets of the best (type heretofore known does not ex ceed 7 5 G. S. units, whereas in the pres ent magnet, the specific coercive force reaches 200 C. G. S. units. 1 For this reason, loss of magnetism orso-called magnetic decay, due to shock or lapse of time is exceed-z ingly small in the case of the present magnet.
- magnetized body of an alloy steel containing cobalt and chromium magnetized body of an alloy steel containing cobalt and chromium.
- a permanent magnet made of an allov containing from about 5 to 60 per cent. cobalt, from about 0.5 to 10 per cent. chromium and carbon steel of from about 0.5 to 2 per cent. carbon.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Hard Magnetic Materials (AREA)
Description
No Drawing.
UNITED STATES PATENT OFFICE.
KOTARO HONDA, OF YO NEGA-FUKURO, SENDAI, JAPAN, ASSIGNOR TO SUMITOMO CHUKOSHO, LTD, OF OSAKA, JAPAN, A CORPORATION OF JAPAN.
MAGNET-STEEL.
To all whom it may concern Be it known that I, Ko'rAno I'IONDA D. Sc., citizen of Japan, residing at No. 21,l(anoko Shimidzu, Yonega-fukuro, Sendai, Japan, have invented certain new and useful Improvements in Magnet-Steel; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. 1
This invention relates to novel magnet steels and to magnets made therefrom. More particularly, the invention relates to the manufacture of permanent magnets from alloys comprising carbon steel, cobalt,
and a metal of the chromium family. Magnets made in accordance with the invention materially excel magnets heretofore known especially in point of strong residual. magnetism and large coercive force.
In the particular embodiment of themvention herein disclosed and. claimed, the
metal chromium itself is an essential ingredient of the alloy steel employed. In my copending application Serial No. 197,837,
filed October 22, 1917, the generic invention,
of which the present application covers a specific phase, is broadly claimed.
In a typical instance, a magnet embodying the principles of the invention may be made of an alloy steel having the following ralge of composition:
obalt, 5-6070; chromium, 05-10%; a.-
bon steel, (with.O.5-2% carbon,) the remainder. Most desirably the cobalt content is from 20 to and 35% has been found particularly suitable. Other elements commonly present in steel may also be present in the alloy, and vanadium or the like may also be added.
In manufacturing-this alloy steel, a mixture of the above-mentioned metallic ingredients may be melted at a temperature of, say 1700 to 1800 (l, and poured to form an ingot. When sufiiciently cooled the ingot is forged and worked into the form of a magnet, and is then hardened as by quenching at a temperature of say 1100 0., for example, this temperature being consid- Specification of Letters Patent. Patented Apr. 27, 1920.
, Application filed October 22, 1917. Serial No. 197,838.
erably higher than the quenching tempera ture for ordinary magnet steel which is about 800 C. After quenching, the shaped body of paramagnetic metallic material is. strongly magnetized with the aid of a powerful magnet or coil.
The magnet produced in the manner described is far superior to magnets heretofore known in the art, particularly as regardsi (1) Coercive force which in magnets of the best (type heretofore known does not ex ceed 7 5 G. S. units, whereas in the pres ent magnet, the specific coercive force reaches 200 C. G. S. units. 1 For this reason, loss of magnetism orso-called magnetic decay, due to shock or lapse of time is exceed-z ingly small in the case of the present magnet.
(2) Intensity of magnetization per unit volume, which in the known magnets of the best type rarely exceeds 450 C. G. S. units 1. The method of preparing permanent magnets which comprisesv quenching at a temperature substantially above 800 C., a body of an alloy steel containing cobalt and chromium, and thereafter magnetizing said body.
2. As a new article of manufacture, a
magnetized body of an alloy steel containing cobalt and chromium.
3. As a new article of manufacture, a permanent magnet made of an allov containing from about 5 to 60 per cent. cobalt, from about 0.5 to 10 per cent. chromium and carbon steel of from about 0.5 to 2 per cent. carbon.
In testimony whereof I hereunto afiixmy signature.
KOTARO HONDA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US197838A US1338133A (en) | 1917-10-22 | 1917-10-22 | Magnet-steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US197838A US1338133A (en) | 1917-10-22 | 1917-10-22 | Magnet-steel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US1338133A true US1338133A (en) | 1920-04-27 |
Family
ID=22730944
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US197838A Expired - Lifetime US1338133A (en) | 1917-10-22 | 1917-10-22 | Magnet-steel |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US1338133A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3233587A (en) * | 1962-10-09 | 1966-02-08 | Bell & Howell Co | Electrophotographic brush assembly |
| US3515540A (en) * | 1964-12-16 | 1970-06-02 | Du Pont | Mixed cobalt/tungsten carbide powders |
| US5741374A (en) * | 1997-05-14 | 1998-04-21 | Crs Holdings, Inc. | High strength, ductile, Co-Fe-C soft magnetic alloy |
-
1917
- 1917-10-22 US US197838A patent/US1338133A/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3233587A (en) * | 1962-10-09 | 1966-02-08 | Bell & Howell Co | Electrophotographic brush assembly |
| US3515540A (en) * | 1964-12-16 | 1970-06-02 | Du Pont | Mixed cobalt/tungsten carbide powders |
| US5741374A (en) * | 1997-05-14 | 1998-04-21 | Crs Holdings, Inc. | High strength, ductile, Co-Fe-C soft magnetic alloy |
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