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US4093449A
Expired / Lapsed
US
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Phosphorus steel powder and a method of manufacturing the same
Assignee: Hoeganaes Corp
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Filing: 1976-10-26
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Granted: 1978-06-06
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Expires: 1996-10-26
Abstract
Abstract A phosphorus steel powder for manufacturing sintered details having an extremely small tendency to brittleness ruptures consists of iron or steel powder substantially free from phosphorus, mixed with a phosphorus powder characterized by a maximum particle size of 20 μm, preferably a maximum particle size of 10 μm. The phosphorus content of the ferrophosphorus powder shall exceed 2.8% and in order to reduce the wearing of the tools the phosphorus content shall be less than 17%. If the ferrophosphorus powder is manufactured by grinding piece goods the phosphorus content shall exceed 12% and shall preferably be between 14 and 16%. The phosphorus content of the preferred mixture is between 0.2 and 1.5%. The iron-ferrophosphorus mixture is heated with or without the addition of oil in reducing atmosphere to a temperature of between 650° and 900° C for a period of 15 minutes to 2 hours to improve the protection against segregation.
Inventors
- 👤 Lars-Erik Svensson
- 👤 Jan Robert Tengzelius
- 👤 Per Folke Lindskog
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:27
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0207; C22C33/0214
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
73 words
A phosphorous steel powder for manufacturing sintered mouldings having high toughness and strength, comprising a basic powder of a steel powder substantially free from phosphorus and having good compressibility to which is intimately added a low-temperature-melting ferrophosphorus powder having a phosphorus content of at least 2.8%, in such an amount that the phosphorus content of the mixture is 0.2 to 1.5%, wherein the ferrophosphorus powder has a maximum particle size of 20 μm.
Claim 2
Dependent Claim
73 words
A phosphorous steel powder for manufacturing sintered mouldings having high toughness and strength, comprising a basic powder of a steel powder substantially free from phosphorus and having good compressibility to which is intimately added a low-temperature-melting ferrophosphorus powder having a phosphorus content of at least 2.8%, in such an amount that the phosphorus content of the mixture is 0.2 to 1.5%, wherein the ferrophosphorus powder has a maximum particle size of 20 μm.
Claim 3
Dependent Claim
27 words
A phosphorous steel powder as claimed in claim 1, said powder further comprising 0.005 to 0.02% of a fluent mineral oil for diminishing the risk of segregation.
Claim 4
Dependent Claim
28 words
A phosphorous steel powder as claimed in claim 1, wherein the ferrophosphorus particles are by means of sintering substantially adhered to the steel powder particles for obviating segregation.
Claim 5
Independent Claim
40 words
A method of manufacturing a phosphorous steel powder wherein a basic powder of steel powder is intimately mixed with ferrophosphorus powder and the ferrophosphorus particles are adhered to the steel powder particles by adding 0.005 to 0.02% fluent mineral oil.
Claim 6
Independent Claim
40 words
A method of manufacturing a phosphorous steel powder wherein a basic powder of steel powder is intimately mixed with ferrophosphorus powder and the ferrophosphorus particles are adhered to the steel powder particles by adding 0.005 to 0.02% fluent mineral oil.
Claim 7
Dependent Claim
43 words
A method as claimed in claim 4, wherein the ferrophosphorus powder is first mixed with a portion of the steel powder to a concentrate with the addition of 0.005 to 0.02% fluent mineral oil and the concentrate is subjected to sintering and disintegration.
Claim 8
Dependent Claim
18 words
The powder of claim 1 wherein said ferrophosphorus powder has a phosphorus content between 12 and 17 percent.
Claim 9
Dependent Claim
17 words
The powder of claim 1 wherein said ferrophosphorus powder has a maximum particle size of 10 μm.
Claim 10
Independent Claim
52 words
A method of manufacturing a phosphorus steel powder wherein a basic powder of steel powder is intimately mixed with ferrophosphorus powder having a maximum particle size of 20 μm and adhering the ferrophosphorus particles to the steel powder particles by a loose sintering with subsequent cautious disintegration of the cakes thus created.
Claim 11
Independent Claim
52 words
A method of manufacturing a phosphorus steel powder wherein a basic powder of steel powder is intimately mixed with ferrophosphorus powder having a maximum particle size of 20 μm and adhering the ferrophosphorus particles to the steel powder particles by a loose sintering with subsequent cautious disintegration of the cakes thus created.
Claim 12
Dependent Claim
29 words
The method of claim 4 wherein the ferrophosphorus particles are adhered to the steel powder particles by a loose sintering with subsequent cautious disintegration of the cakes thus created.
Claim 13
Dependent Claim
16 words
The method of claim 5 including the step of adding alloying powder to the steel powder.
Claim 14
Dependent Claim
17 words
The method of claim 4 wherein the ferrophosphorus powder has a maximum particle size of 10 μm.
Claim 15
Dependent Claim
50 words
A phosphorus steel powder for manufacturing sintered mouldings having high toughness and strength, comprising a basic powder of a steel powder substantially free from phosphorus and having good compressibility to which is intimately added a low-temperature-melting ferrophosphorus powder wherein the ferrophosphorus powder has a maximum particle size of 20 μm.
Claim 16
Dependent Claim
50 words
A phosphorus steel powder for manufacturing sintered mouldings having high toughness and strength, comprising a basic powder of a steel powder substantially free from phosphorus and having good compressibility to which is intimately added a low-temperature-melting ferrophosphorus powder wherein the ferrophosphorus powder has a maximum particle size of 20 μm.
Claim 17
Dependent Claim
17 words
The method of claim 12 wherein said ferrophosphorus powder has a maximum particle size of 10 μm.
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) | 1981-06-05 | 1981-12-05 | 1982-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-05 | 1985-12-05 | 1986-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-05 | 1989-12-05 | 1990-06-06 | $7700.00 | Window Closed / Lapsed |