Claims
- 1. A steel powder suited for powder metallurgical purposes, characterized in that it consists of an amorphous to compact-grained, essentially dendrite-free material with irregularly cornered particle shape.
- 2. A steel powder according to claim 1, characterized in that the steel has a hardness of at least HRC=60.
- 3. An article manufactured from powder in a powder metallurgical manner, characterized in that the powder comprises the steel powder according to claim 1.
- 4. A process for the production of a steel powder suited for powder metallurgical purposes, comprising the steps of (1) causing, in a vacuum or protective gas, molten steel of such composition that rapid cooling of thin films of the melt produces brittle crushable films to impinge upon a cold metal surface having great cooling capacity moving rapidly and substantially across the direction of delivery of the molten steel, thereby forming a thin, brittle, and easily crushed, amorphous to compact-grained, essentially dendrite-free steel film, and (2) crushing or grinding the steel film into a powder of an irregularly cornered particle shape.
- 5. A process according to claim 4, in which the molten steel cools at a rate of at least about 10.sup.4 .degree. C/s.
- 6. A process according to claim 5, in which the cooling rate is at least about 10.sup.6 .degree. C/s.
- 7. A process according to claim 4, wherein the films' thickness is at most about 0.5 mm.
- 8. A process according to claim 7, wherein the films' thickness is about 0.1 mm.
- 9. A process according to claim 7, in which flake-shaped films are produced having a ratio of length to thickness of at least 100, a ratio of width to thickness of at least about 20, and a ratio of length to width of at most about 5.
- 10. A process according to claim 4, in which the films produced have a hardness of at least HRC=60.
Priority Claims (1)
Number |
Date |
Country |
Kind |
7414811 |
Nov 1974 |
SW |
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CROSS REFERENCES TO RELATED APPLICATIONS
This application is a continuation in part of applicant's copending application Ser. No. 634,343, filed Nov. 24, 1975, now abandoned.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
3151971 |
Clough |
Oct 1964 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
2,127,563 |
Dec 1972 |
DT |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
634343 |
Nov 1975 |
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