US4043807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alloy steels
Assignee: Huntington Alloys Corp
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Filing: 1976-02-10
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Granted: 1977-08-23
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Expires: 1996-02-10
Abstract
Abstract An alloy steel containing correlated percentages of nickel, copper, carbon, niobium, manganese, aluminum, chromium, molybdenum, silicon, boron, etc., the alloy being characterized by a combination of high strength and good toughness.
Inventors
- 👤 Ivor Kirman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:41
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/16; C22C38/08; C22C38/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
170 words
A low alloy, high strength steel characterized by good toughness, weldability and cold formability and consisting of from about 0.01 to 0.09% carbon, about 0.4% to about 0.8% nickel, about 0.7% to about 1.1% copper, about 0.2 to about 0.1% niobium, about 1.1% to about 1.65% manganese, aluminum present up to 0.08%, up to 0.5% each of chromium and molybdenum, up to about 0.6% silicon, up to about 0.01% boron, up to about 0.1% of at least one metal selected from the group consisting of zirconium, magnesium, calcium, and rare earths, the balance being essentially iron, said steel being further characterized in that the carbon equivalent expressed by the formula: ##EQU2## is not more than 0.41, said steel being further characterized in that the strength level is at least about 450 MN/m 2 and the 70J longitudinal impact transition temperature is below about -10° C. over section thickness of at least 15 to 35 mm notwithstanding that the steel was finished hot rolled at a temperature up to 1050° C.
Claim 2
Dependent Claim
170 words
A low alloy, high strength steel characterized by good toughness, weldability and cold formability and consisting of from about 0.01 to 0.09% carbon, about 0.4% to about 0.8% nickel, about 0.7% to about 1.1% copper, about 0.2 to about 0.1% niobium, about 1.1% to about 1.65% manganese, aluminum present up to 0.08%, up to 0.5% each of chromium and molybdenum, up to about 0.6% silicon, up to about 0.01% boron, up to about 0.1% of at least one metal selected from the group consisting of zirconium, magnesium, calcium, and rare earths, the balance being essentially iron, said steel being further characterized in that the carbon equivalent expressed by the formula: ##EQU2## is not more than 0.41, said steel being further characterized in that the strength level is at least about 450 MN/m 2 and the 70J longitudinal impact transition temperature is below about -10° C. over section thickness of at least 15 to 35 mm notwithstanding that the steel was finished hot rolled at a temperature up to 1050° C.
Claim 3
Dependent Claim
29 words
A steel in accordance with claim 1 containing 0.5% to 0.7% nickel, 0.8% to 1% copper, 0.05% to 0.09% niobium, 0.01% to 0.06% carbon, and 1.2% to 1.4% manganese.
Claim 4
Dependent Claim
36 words
A steel in accordance with claim 1 containing at least one metal from the group consisting of zirconium, magnesium, calcium and rare earths in a small but effective amount sufficient to render the steel more isotropic.
Claim 5
Dependent Claim
28 words
A steel in accordannce with claim 3 containing from 0.02% to 0.06% of at least one metal from the groups consisting of zirconium, magnesium, calcium, and rare earths.
Claim 6
Dependent Claim
9 words
A steel in accordance with claim 3 containing magnesium.
Claim 7
Dependent Claim
9 words
A steel in accordance with claim 3 containing zirconium.
Claim 8
Dependent Claim
13 words
A steel in accordance with claim 1 containing about 0.002% to 0.004% boron.
References Cited (Backward Citations)
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GB1170569A
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US3592633A
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US3666570A
Cited
US3897279A
Cited
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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) | 1980-08-22 | 1981-02-21 | 1981-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-22 | 1985-02-21 | 1985-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-22 | 1989-02-21 | 1989-08-23 | $7700.00 | Window Closed / Lapsed |