US4452756A
Expired / Lapsed
US
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Method for producing a machinable, high strength hot formed powdered ferrous base metal alloy
Assignee: Clevite Industries Inc
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Filing: 1982-06-21
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Granted: 1984-06-05
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Expires: 2002-06-21
Abstract
Abstract A method for producing a machinable, high strength hot formed powdered ferrous base metal alloy is provided which comprises providing a particulate mixture consisting of, in weight percent, from about 1.0 to about 3.0 percent copper, from about 0.16 to about 0.35 percent sulfur, from about 0.4 to about 0.8 percent carbon, with the balance being iron plus from 0 to about 2 percent incidental impurities; forming this particulate mixture into a preformed article having a predetermined configuration; sintering the so-formed article at a temperature sufficient to produce the desired alloy; and subjecting the sintered article to a hot forming treatment to produce a hot formed, machinable, high strength ferrous base powdered metal alloy article having a density near theoretical.
Inventors
- 👤 Keith C. McLeod
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:09
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0264; B; B22; B22F; B22F3/00; B22F3/12; B22F3/16; B22F2998/00; B22F2998/10
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
111 words
A method for producing a machinable, ductile high strength hot formed powdered ferrous metal alloy comprising: providing a particulate mixture consisting of, in weight percent, from about 1.0 to about 3.0 percent copper, from about 0.16 to about 0.35 percent sulfur, from about 0.4 to about 0.8 percent carbon, with the balance being iron plus from 0 to about 2.0 percent incidental impurities; forming said mixture into a preformed article having a predetermined configuration; sintering said so-formed article at a temperature sufficient to produce the desired alloy; and subjecting said sintered article to a heating and forming treatment so as to produce a hot formed article having a density near theoretical.
Claim 2
Independent Claim
111 words
A method for producing a machinable, ductile high strength hot formed powdered ferrous metal alloy comprising: providing a particulate mixture consisting of, in weight percent, from about 1.0 to about 3.0 percent copper, from about 0.16 to about 0.35 percent sulfur, from about 0.4 to about 0.8 percent carbon, with the balance being iron plus from 0 to about 2.0 percent incidental impurities; forming said mixture into a preformed article having a predetermined configuration; sintering said so-formed article at a temperature sufficient to produce the desired alloy; and subjecting said sintered article to a heating and forming treatment so as to produce a hot formed article having a density near theoretical.
Claim 3
Dependent Claim
26 words
The method of claim 1 wherein said sintered, hot formed article is subjected to a machining treatment to produce an article having the desired final dimensions.
Claim 4
Dependent Claim
33 words
The method of claim 1 wherein said particulate mixture is subjected to a mixing treatment to produce a homogeneous mixture of particles prior to being formed into an article of the desired configuration.
Claim 5
Dependent Claim
25 words
The method of claim 1 wherein said sintered preformed article is coated with a graphite lubricant prior to subjecting it to a hot forming treatment.
Claim 6
Dependent Claim
15 words
The method of claim 1 wherein said hot forming treatment is a hot forging treatment.
Claim 7
Dependent Claim
30 words
The method of claim 1 wherein said preformed article is compacted to a degree sufficient to cause it to have a density which is greater than 75 percent of theoretical.
Claim 8
Dependent Claim
17 words
The method of claim 1 wherein said sintered preformed article is reheated prior to being hot formed.
Claim 9
Dependent Claim
35 words
The method of claim 5 wherein said sintered article is subjected to a hot forging treatment to a degree sufficient to produce a resultant article having a density of at least 99 percent of theoretical.
Claim 10
Dependent Claim
111 words
A machinable, ductile high strength powdered ferrous based metal alloy which is produced by a process which comprises the steps of: providing a particulate mixture consisting of, in weight percent, from about 1.0 to about 3.0 percent copper, from about 0.16 to about 0.35 percent sulfur, from about 0.4 to about 0.8 percent carbon, with the balance being iron plus from 0 to about 2.0 percent incidental impurities; forming said mixture into a preformed article having a predetermined configuration; sintering said so-formed article at a temperature sufficient to produce the desired alloy; and subjecting said sintered article to a heating and forming treatment so as to produce a hot formed article.
Claim 11
Dependent Claim
111 words
A machinable, ductile high strength powdered ferrous based metal alloy which is produced by a process which comprises the steps of: providing a particulate mixture consisting of, in weight percent, from about 1.0 to about 3.0 percent copper, from about 0.16 to about 0.35 percent sulfur, from about 0.4 to about 0.8 percent carbon, with the balance being iron plus from 0 to about 2.0 percent incidental impurities; forming said mixture into a preformed article having a predetermined configuration; sintering said so-formed article at a temperature sufficient to produce the desired alloy; and subjecting said sintered article to a heating and forming treatment so as to produce a hot formed article.
Claim 12
Dependent Claim
26 words
The article of claim 9 wherein said sintered, hot formed article is subjected to a machining treatment to produce an article having the desired final dimensions.
Claim 13
Dependent Claim
33 words
The article of claim 9 wherein said particulate mixture is subjected to a mixing treatment to produce a homogeneous mixture of particles prior to being formed into an article of the desired configuration.
Claim 14
Dependent Claim
25 words
The article of claim 9 wherein said sintered preformed article is coated with a graphite lubricant prior to subjecting it to a hot forming treatment.
Claim 15
Dependent Claim
15 words
The method of claim 9 wherein said hot forming treatment is a hot forging treatment.
Claim 16
Dependent Claim
30 words
The method of claim 9 wherein said preformed article is compacted to a degree sufficient to cause it to have a density which is greater than 75 percent of theoretical.
Claim 17
Dependent Claim
35 words
The article of claim 13 wherein said sintered article is subject to a hot forging treatment to a degree sufficient to produce a resultant article having a density of at least 99 percent of theoretical.
Claim 18
Dependent Claim
17 words
The article of claim 9 wherein said sintered preformed article is reheated prior to being hot formed.
References Cited (Backward Citations)
US4086390A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1987-06-05 | 1987-12-05 | 1988-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-05 | 1991-12-05 | 1992-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-05 | 1995-12-05 | 1996-06-05 | $7700.00 | Window Closed / Lapsed |