Patent US4765836A successfully refreshed from Google Patents.
US4765836A
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US
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Wear and corrosion resistant articles made from pm alloyed irons
Assignee: Crucible Materials Corp
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Filing: 1986-12-11
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Granted: 1988-08-23
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Expires: 2006-12-11
Abstract
Abstract A powder-metallurgy alloy article having a good combination of wear resistance and corrosion resistance. The article is further characterized by an attainable minimum hardness after heat treatment of 60R c and a martensitic structure. The article is made from prealloyed particles of the composition, in percent by weight, carbon 2.5-5, manganese 0.2-1, phosphorus 0.10 maximum, sulfur 0.10 maximum, silicon 1 maximum, nickel 0.5 maximum, chromium 15-30, molybdenum, 2-10 vanadium 6-11, nitrogen 0.15 maximum and balance, iron. The article has a fine, uniform distribution of a MC and other carbide phases.
Inventors
- 👤 John J. Hauser
- 👤 William Stasko
- 👤 Kenneth E. Pinnow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:17
CPC Classifications
C; C22; C22C; C22C37/00; C22C37/06; C22C33/00; C22C33/02; C22C33/0257; C22C33/0278; C22C33/0285
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
113 words
An alloy article characterized by a good combination of wear resistance and corrosion resistance and having a martensitic structure upon austenitizing, quenching and tempering, said article comprising compacted prealloyed particles of a composition consisting essentially of, in weight percent: carbon, 2.5 to 5 manganese 0.2 to 1 phosphorus 0.10 max. sulfur 0.10 max. silicon 1 max. nickel 0.5 max. chromium 15 to 30 molybdenum 2 to 10 vanadium 6 to 11 nitrogen 0.15 max. iron balance, including incidental impurities, said carbon being present in an amount balanced with vanadium, molybdenum and chromium to form carbides therewith and with sufficient remaining carbon to ensure said martensitic structure with a fine, uniformly distributed MC-carbide phase.
Claim 2
Dependent Claim
113 words
An alloy article characterized by a good combination of wear resistance and corrosion resistance and having a martensitic structure upon austenitizing, quenching and tempering, said article comprising compacted prealloyed particles of a composition consisting essentially of, in weight percent: carbon, 2.5 to 5 manganese 0.2 to 1 phosphorus 0.10 max. sulfur 0.10 max. silicon 1 max. nickel 0.5 max. chromium 15 to 30 molybdenum 2 to 10 vanadium 6 to 11 nitrogen 0.15 max. iron balance, including incidental impurities, said carbon being present in an amount balanced with vanadium, molybdenum and chromium to form carbides therewith and with sufficient remaining carbon to ensure said martensitic structure with a fine, uniformly distributed MC-carbide phase.
Claim 3
Dependent Claim
51 words
The alloy article of claim 1 wherein said prealloyed particles have a composition consisting essentially of, in weight percent: carbon 3 to 4 manganese 0.3 to 0.7 sulfur 0.02 max. silicon 0.4 to 0.7 chromium 22 to 27 molybdenum 2.75 to 3.25 vanadium 7.5 to 10 iron balance, including incidental impurities.
Claim 4
Dependent Claim
21 words
The alloy article of claim 1 or claim 2 having an attainable minimum hardness after heat treatment of 60R c .
Claim 5
Dependent Claim
14 words
A monolithic alloy article in accordance with claim 2 comprising said compacted prealloyed particles.
Claim 6
Dependent Claim
17 words
A clad alloy article in accordance with claim 1 having a cladding comprising said compacted prealloyed particles.
Claim 7
Dependent Claim
17 words
A clad alloy article in accordance with claim 2 having a cladding comprising said compacted prealloyed particles.
Claim 8
Dependent Claim
22 words
The clad alloy article of claim 5 or claim 6 having an attainable minimum hardness after heat treatment of 60R c .
Claim 9
Dependent Claim
14 words
A monolithic alloy article in accordance with claim 1 comprising said compacted prealloyed particles.
Claim 10
Dependent Claim
22 words
The monolithic alloy article of claim 8 or claim 5 having an attainable minimum hardness after heat treatment of 60R c .
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-23 | 1992-02-22 | 1992-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-23 | 1996-02-22 | 1996-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-23 | 2000-02-22 | 2000-08-23 | $7700.00 | Window Closed / Lapsed |