US4767456A
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Corrosion and wear resistant metal alloy having high hot hardness and toughness
Assignee: SKF USA Inc
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Filing: 1987-03-26
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Granted: 1988-08-30
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Expires: 2007-03-26
Abstract
Abstract A corrosion and wear resistant sintered powdered metal alloy having a density of at least 99.9 percent of theoretical density is provided. The alloy comprises, in weight percent, from about 13 to about 17 percent chromium, from about 5.5 to about 8.5 percent molybdenum, from about 1.25 to about 2.5 percent vanadium, and from about 1.2 to about 1.65 percent carbon, with the balance being iron plus trace elements. The foregoing alloy is used to produce corrosion and wear resistant bearings which are characterized by high hot hardness and toughness.
Inventors
- 👤 Ronald F. Spitzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:04
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0278; C22C33/0285
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
58 words
A corrosion resistant, high hardness and wear resistant alloy having a density of at least a 99.9 percent of theoretical density, comprising, in weight percent from about 13 to about 17 percent chromium; from about 5.5 to about 8.5 percent molybdenum; from about 1.2 to about 1.65 percent carbon; and from about 1.25 to about 2.5 percent vanadium.
Claim 2
Dependent Claim
58 words
A corrosion resistant, high hardness and wear resistant alloy having a density of at least a 99.9 percent of theoretical density, comprising, in weight percent from about 13 to about 17 percent chromium; from about 5.5 to about 8.5 percent molybdenum; from about 1.2 to about 1.65 percent carbon; and from about 1.25 to about 2.5 percent vanadium.
Claim 3
Dependent Claim
46 words
The alloy of claim 1, wherein, in weight percent chromium is present in about 15 percent, molybdenum is present in about 6.5 percent, vanadium is present in about 1.8 percent and carbon is present in about 1.5 percent, with the balance being iron plus trace elements.
Claim 4
Dependent Claim
24 words
The alloy of claim 1, wherein columbium is present in weight percent, in an amount ranging from about a trace to about 0.15 percent.
Claim 5
Dependent Claim
25 words
The metal alloy of claim 1, wherein boron is present, in weight percent, in an amount ranging from about a trace to about 0.15 percent.
Claim 6
Dependent Claim
66 words
A bearing structure formed from centered powdered metal alloy having a density of at least 99.9 percent of theoretical density which comprises, in weight percent, from about 13 to about 17 percent chromium, from about 5.5 to about 8.5 percent molybdenum, from about 1.25 to about 2.5 percent vanadium and from about 1.2 to about 1.65 percent carbon, with the balance being iron plus trace elements.
Claim 7
Dependent Claim
66 words
A bearing structure formed from centered powdered metal alloy having a density of at least 99.9 percent of theoretical density which comprises, in weight percent, from about 13 to about 17 percent chromium, from about 5.5 to about 8.5 percent molybdenum, from about 1.25 to about 2.5 percent vanadium and from about 1.2 to about 1.65 percent carbon, with the balance being iron plus trace elements.
Claim 8
Dependent Claim
46 words
The bearing structure of claim 5, wherein, in weight percent, chromium is present in about 15 percent, molybdenum is present in about 6.5 percent, vanadium is present in about 1.8 percent, carbon is present in about 1.5 percent, and the balance is iron plus trace elements.
Claim 9
Dependent Claim
25 words
The bearing structure of claim 5, wherein columbium is present, in weight percent, in an amount ranging from about a trace to about 0.15 percent.
Claim 10
Dependent Claim
25 words
The bearing structure of claim 5, wherein boron is present, in weight percent, in an amount ranging from about a trace to about 0.15 percent.
Claim 11
Independent Claim
98 words
A method for producing a powdered metal bearing structure which comprises: providing a particulate material comprising, in weight percent, from about 13 to about 17 percent chromium, from about 5.5 to about 8.5 percent molybdenum, from about 1.25 to about 2.5 percent vanadium, and from about 1.2 to about 1.65 percent carbon, with the balance being iron plus trace elements; forming the so obtained mixture into an article of the desired configuration; and subjecting the so-formed article to a consolidation treatment to produce an article having desired alloy composition and density of at least 99.9 percent of theoretical.
Claim 12
Independent Claim
98 words
A method for producing a powdered metal bearing structure which comprises: providing a particulate material comprising, in weight percent, from about 13 to about 17 percent chromium, from about 5.5 to about 8.5 percent molybdenum, from about 1.25 to about 2.5 percent vanadium, and from about 1.2 to about 1.65 percent carbon, with the balance being iron plus trace elements; forming the so obtained mixture into an article of the desired configuration; and subjecting the so-formed article to a consolidation treatment to produce an article having desired alloy composition and density of at least 99.9 percent of theoretical.
Claim 13
Dependent Claim
46 words
The method of claim 9 wherein, in weight percent, chromium is present in about 15 percent, molybdenum is present in about 6.5 percent, vanadium is present in about 1.8 percent and carbon is present in about 1.5 percent, with the balance being iron plus trace elements.
Claim 14
Dependent Claim
24 words
The method of claim 9 wherein columbium is present, in weight percent, in an amount ranging from about a trace to about 0.15 percent.
Claim 15
Dependent Claim
24 words
The method of claim 9 wherein boron is present, in weight percent, in an amount ranging from about a trace to about 0.15 percent.
Claim 16
Dependent Claim
17 words
The method of claim 9 wherein said consolidation treatment is accomplished by means of hot isotactic pressing.
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) | 1991-08-30 | 1992-02-29 | 1992-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-30 | 1996-02-29 | 1996-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-30 | 2000-02-29 | 2000-08-30 | $7700.00 | Window Closed / Lapsed |