US3836355A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steel powder containing phosphorus
Assignee: Hoganas AB
•
Filing: 1973-04-11
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Granted: 1974-09-17
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Expires: 1993-04-11
Abstract
Abstract In the manufacture of articles by compacting and sintering steel powder it is desired that the articles shall neither expand nor shrink during the sintering process. It has been found useful to incorporate into the steel powder an iron-phosphorus alloy powder having the approximate composition Fe3P, in a quantity to give the article a phosphorus content of 0.2 - 3 per cent by weight.
Inventors
- 👤 P Lindskog
- 👤 L Svensson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:56
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0264; C22C33/0271; C22C33/0207; C22C33/0214
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
26 words
Phosphorus containing steel powder according to claim 1, characterized in that it also contains at the most 1.5 percent by weight of a solid lubricant powder.
Claim 2
Dependent Claim
30 words
Phosphorus containing steel powder according to claim 1 characterized in that it also contains 0.005 to 0.02 percent by weight of a thin mineral oil for the prevention of segregation.
Claim 3
Dependent Claim
33 words
Phosphorus containing steel powder according to claim 1, characterized in that the iron-phosphorus alloy particles are bonded to particles of said powdery steel by sintering and subsequent comminution for the prevention of segregation.
Claim 4
Dependent Claim
35 words
Phosphorus containing steel powder as claimed in claim 1, wherein the particle size of said iron-phosphorus alloy powder is such that it passes a screen with an opening of at the most 45 Mu m.
Claim 5
Dependent Claim
25 words
Phosphorus containing steel powder as claimed in claim 1, wherein the phosphorus conteNt of said iron-phosphorus alloy powder is between about 14-16 percent by weight.
Claim 6
Dependent Claim
52 words
Phosphorus containing steel powder as claimed in claim 1, wherein the composition of said iron-phosphorus alloy powder corresponds to that of Fe3P, the relative proportions of said iron-phosphorus alloy powder and said powdery steel being such that the phosphorus content of the mixture is between about 0.3 and 1.5 percent by weight.
Claim 7
Dependent Claim
18 words
Phosphorus containing steel powder as claimed in claim 2, wherein said solid lubricant powder is zinc stearate powder.
Claim 8
Dependent Claim
31 words
Phosphorus containing steel powder as claimed in claim 2, characterized in that it also contains 0.005 to 0.02 percent by weight of a thin mineral oil for the prevention of segregation.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |