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US3941589A
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Abrasion-resistant refrigeration-hardenable white cast iron
Assignee: Cyprus Amax Minerals Co
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Filing: 1975-02-13
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Granted: 1976-03-02
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Expires: 1995-02-13
Abstract
Abstract A tough abrasion-resistant refrigeration-hardenable white cast iron containing as its essential alloying constituents about 2.5% to about 3.5% carbon, about 2.5% to about 3.5% manganese, about 12% to about 22% chromium, about 1% to about 2% silicon, about 1.5% to about 3.0% molybdenum, about 1% to about 2% copper, and the balance iron along with conventional residual elements and incidental impurities present in usual amounts.
Inventors
- 👤 Telfer E. Norman
- 👤 Douglas A. Stolk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:19
CPC Classifications
C; C22; C22C; C22C37/00; C22C37/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
63 words
An abrasion-resistant refrigeration hardenable white cast iron consisting essentially of about 2.5% to about 3.5% carbon, about 12% to about 22% chromium, about 1.5% to about 3.0% molybdenum, about 2.5% to about 3.5% manganese, about 1.0% to about 2.0% copper, about 1% to about 2% silicon, and the balance iron together with incidental impurities and normal residual elements present in the usual amounts.
Claim 2
Dependent Claim
63 words
An abrasion-resistant refrigeration hardenable white cast iron consisting essentially of about 2.5% to about 3.5% carbon, about 12% to about 22% chromium, about 1.5% to about 3.0% molybdenum, about 2.5% to about 3.5% manganese, about 1.0% to about 2.0% copper, about 1% to about 2% silicon, and the balance iron together with incidental impurities and normal residual elements present in the usual amounts.
Claim 3
Dependent Claim
86 words
The abrasion-resistant refrigeration hardenable white cast iron as defined in claim 1, wherein carbon is present in an amount of about 3.0% to about 3.3%, chromium is present in an amount of about 17% to about 20%, molybdenum is present in an amount of from about 1.9% to about 2.2%, manganese is present in an amount of about 2.8% to about 3.2%, copper is present in an amount of about 1.1% to about 1.4%, silicon is present in an amount of about 1.4% to about 1.7%.
Claim 4
Dependent Claim
39 words
The abrasion-resistant refrigeration hardenable white cast iron as defined in claim 1, further characterized by a matrix microstructure free from pearlite and comprising a mixture of martensite and austenite in amounts depending on section size and treatment following casting.
Claim 5
Dependent Claim
64 words
An abrasion-resistant article in a refrigeration hardened state consisting essentially of about 2.5% to about 3.5% carbon, about 12% to about 22% chromium, about 1.5% to about 3.0% molybdenum, about 2.5% to about 3.5% manganese, about 1.0% to about 2.0% copper, about 1% to about 2% silicon, and the balance iron together with incidental impurities and normal residual elements present in the usual amounts.
Claim 6
Dependent Claim
64 words
An abrasion-resistant article in a refrigeration hardened state consisting essentially of about 2.5% to about 3.5% carbon, about 12% to about 22% chromium, about 1.5% to about 3.0% molybdenum, about 2.5% to about 3.5% manganese, about 1.0% to about 2.0% copper, about 1% to about 2% silicon, and the balance iron together with incidental impurities and normal residual elements present in the usual amounts.
Claim 7
Dependent Claim
87 words
The abrasion-resistant article in a refrigeration hardened state as defined in claim 4, wherein carbon is present in an amount of about 3.0% to about 3.3%, chromium is present in an amount of about 17% to about 20%, molybdenum is present in an amount of from about 1.9% to about 2.2%, manganese is present in an amount of about 2.8% to about 3.2%, copper is present in an amount of about 1.1% to about 1.4%, silicon is present in an amount of about 1.4% to about 1.7%.
Claim 8
Dependent Claim
17 words
The article as defined in claim 4, in the form of a component of a pump device.
Claim 9
Dependent Claim
15 words
The article as defined in claim 4, having a Brinell hardness greater than about 550.
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) | 1979-03-02 | 1979-09-01 | 1980-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-02 | 1983-09-01 | 1984-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-02 | 1987-09-01 | 1988-03-02 | $7700.00 | Window Closed / Lapsed |