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Patent US4012227A successfully refreshed from Google Patents.
US4012227A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Highly castable, weldable, corrosion resistant stainless steel
Assignee: Huntington Alloys Corp
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Filing: 1975-06-19
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Granted: 1977-03-15
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Expires: 1995-06-19
Abstract
Abstract A highly-castable, ductile, corrosion-resistant and weldable stainless steel intended for exposure in marine environments. A highly satisfactory composition of the alloy is 24% Ni, 24% Cr, 4% Mo, 2% Si, 0.2% B and balance iron.
Inventors
- 👤 Robin Mackay Forbes Jones
- 👤 Walter Adrian Petersen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:28
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/44; C22C38/54
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
121 words
A highly-castable, ductile, corrosion resistant and weldable stainless steel consisting essentially of, by weight, from about 22% to about 26% chromium, from about 20% to about 30% nickel, from about 2.5% to about 5% molybdenum, from about 1.3% to about 2.7% silicon, from about 0.15% to about 0.3% boron, up to about 2% manganese, up to about 0.07% carbon, and the balance iron with incidental impurities, said stainless steel characterized by sea-air, splash and spray corrosion resistance superior to that exhibited by commercial stainless steels CN-7M and CN-8M and exhibiting freedom from heat-affected zone and weld deposit cracking and being further characterized by a minimum elongation in the room temperature tensile test of at least 10% in the as cast condition.
Claim 2
Dependent Claim
121 words
A highly-castable, ductile, corrosion resistant and weldable stainless steel consisting essentially of, by weight, from about 22% to about 26% chromium, from about 20% to about 30% nickel, from about 2.5% to about 5% molybdenum, from about 1.3% to about 2.7% silicon, from about 0.15% to about 0.3% boron, up to about 2% manganese, up to about 0.07% carbon, and the balance iron with incidental impurities, said stainless steel characterized by sea-air, splash and spray corrosion resistance superior to that exhibited by commercial stainless steels CN-7M and CN-8M and exhibiting freedom from heat-affected zone and weld deposit cracking and being further characterized by a minimum elongation in the room temperature tensile test of at least 10% in the as cast condition.
Claim 3
Dependent Claim
59 words
A stainless steel as defined in claim 1 containing from about 23% to about 25% chromium, from about 23% to about 26% nickel, from about 3% to about 4.5% molybdenum, from about 1.5% to about 2.5% silicon, from about 0.15% to about 0.25% boron, up to about 0.7% manganese, up to about 0.05% carbon, and the balance essentially iron.
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) | 1980-03-14 | 1980-09-13 | 1981-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-14 | 1984-09-13 | 1985-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-14 | 1988-09-13 | 1989-03-15 | $7700.00 | Window Closed / Lapsed |