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US4518427A
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Iron or steel powder, a process for its manufacture and press-sintered products made therefrom
Assignee: Hoganas AB
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Filing: 1982-10-26
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Granted: 1985-05-21
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Expires: 2002-10-26
Abstract
Abstract Chromium-containing iron or steel powder containing about 0.2-15 percent by weight of chromium, the rest being iron. The powder is characterized thereby that the chromium is present in the form of a powder-formed Fe-Cr-alloy in α-phase containing about 40-50 percent by weight of chromium and having a particle size essentially less than about 50 μm; a process for manufacturing the powder and pressed and sintered products manufactured in a powder-metallurgical manner starting from the said powder.
Inventors
- 👤 Jan R. Tengzelius
- 👤 Carl-Axel Blande
- 👤 Lars-Erik Svensson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:31
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0207
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
94 words
Chromium-containing iron or steel powder suitable for compressing and sintering to form a substantially homogeneous article having good strength and dimensional stability properties comprising a mixture of iron powder and a chromium-containing powder and containing about 0.2-15% by weight of chromium, the rest being iron with usual accessorial elements, optionally together with other conventional alloying elements of alloyed powders, characterized thereby that the chromium is present in the form of a pulverulent Fe-Cr-alloy in α-phase which contains about 40-50% by weight of Cr and has a particle size essentially lower than about 44 μm.
Claim 2
Dependent Claim
94 words
Chromium-containing iron or steel powder suitable for compressing and sintering to form a substantially homogeneous article having good strength and dimensional stability properties comprising a mixture of iron powder and a chromium-containing powder and containing about 0.2-15% by weight of chromium, the rest being iron with usual accessorial elements, optionally together with other conventional alloying elements of alloyed powders, characterized thereby that the chromium is present in the form of a pulverulent Fe-Cr-alloy in α-phase which contains about 40-50% by weight of Cr and has a particle size essentially lower than about 44 μm.
Claim 3
Dependent Claim
30 words
Powder according to claim 1, characterized thereby that its chromium content is about 1-10 percent by weight and that the particle size of the alloy is below about 44 μm.
Claim 4
Dependent Claim
18 words
Powder according to claim 1, characterized by further containing up to 0.10% of a binder to prevent demixing.
Claim 5
Dependent Claim
30 words
Powder according to claim 1, characterized thereby that its chromium content is about 1-10 percent by weight and that the particle size of the alloy is below about 15 μm.
References Cited (Backward Citations)
US3698877A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-05-20 | 1988-11-19 | 1989-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-20 | 1992-11-19 | 1993-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-20 | 1996-11-19 | 1997-05-21 | $7700.00 | Window Closed / Lapsed |