Patent US4402289A successfully refreshed from Google Patents.
US4077801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Iron-chromium-nickel heat resistant castings
Assignee: MANOIR-ELECTROALLOYS CORP A CORP OF DE
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Filing: 1977-08-15
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Granted: 1978-03-07
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Expires: 1997-08-15
Abstract
Abstract Castings of carbon 0.25/0.8, nickel 8/62, chromium 12/32, tungsten 0.05/2, titanium 0.05/1, balance iron (substantially) of austenitic microstructure, essentially free of cobalt and molybdenum, and not requiring heat treatment to develop service properties considerably improved compared to standard ACI alloy grades.
Inventors
- 👤 Bruce A. Heyer
- 👤 Donald L. Huth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:15
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/44; C22C19/00; C22C19/03; C22C19/05; C22C19/051; C22C19/055; C22C38/50
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
154 words
A heat resistant alloy in as-cast form essentially in the configuration required for service, neither worked nor heat treated, said casting consisting of the following elements in weight percent: ______________________________________
Carbon 0.25 to 0.8
Nickel 8 to 62
Chromium 12 to 32
Tungsten 0.05 to not more than about 2
Titanium 0.05 to less than 1
Silicon up to 3.5
Manganese up to 3
Niobium up to 2
Nitrogen up to 0.3
balance iron except for normal tramp elements deoxidizers and
foundry impurities
______________________________________ wherein (a) the elements carbon, nickel and chromium are so balanced that the microstructure is austenite substantially devoid of ferrite whilst (b) the amount of tungsten combined with titanium is present in amounts which produce a value of creep rupture strength exceeding by at least five percent the creep rupture strength of the standard ACI cast alloys at least over the range HH through HP not containing tungsten and titanium.
Claim 2
Dependent Claim
154 words
A heat resistant alloy in as-cast form essentially in the configuration required for service, neither worked nor heat treated, said casting consisting of the following elements in weight percent: ______________________________________
Carbon 0.25 to 0.8
Nickel 8 to 62
Chromium 12 to 32
Tungsten 0.05 to not more than about 2
Titanium 0.05 to less than 1
Silicon up to 3.5
Manganese up to 3
Niobium up to 2
Nitrogen up to 0.3
balance iron except for normal tramp elements deoxidizers and
foundry impurities
______________________________________ wherein (a) the elements carbon, nickel and chromium are so balanced that the microstructure is austenite substantially devoid of ferrite whilst (b) the amount of tungsten combined with titanium is present in amounts which produce a value of creep rupture strength exceeding by at least five percent the creep rupture strength of the standard ACI cast alloys at least over the range HH through HP not containing tungsten and titanium.
Claim 3
Dependent Claim
26 words
A heat resistant alloy casting according to claim, 1 in which the amount of tungsten is in the range of about 0.1 to about 0.6 percent.
Claim 4
Dependent Claim
34 words
A heat resistant alloy casting according to claim 1 in which the amount of chromium is 24/28 and that of nickel is 11/14, in which tungsten is 0.1/1.2 and in which titanium is 0.1/0.6.
Claim 5
Dependent Claim
34 words
A heat resistant alloy casting according to claim 1 in which the amount of chromium is 24/28 and that of nickel is 18/22, in which tungsten is 0.1/1.2 and in which titanium is 0.1/0.6.
Claim 6
Dependent Claim
34 words
A heat resistant alloy casting according to claim 1 in which the amount of chromium is 19/23 and that of nickel is 23/27, in which tungsten is 0.1/1.2 and in which titanium is 0.1/0.6.
Claim 7
Dependent Claim
37 words
A heat resistant alloy casting according to claim 1 in which the amount of chromium is 20/24 and in which the amount of nickel is 34/38, in which tungsten is 0.1/1.2 and in which titanium is 0.1/0.6.
References Cited (Backward Citations)
GB1252218A
Cited
US3826649A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-06 | 1981-09-05 | 1982-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-06 | 1985-09-05 | 1986-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-06 | 1989-09-05 | 1990-03-07 | $7700.00 | Window Closed / Lapsed |