US3926686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-strength low-alloy steel
Assignee: Algoma Steel Inc
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Filing: 1974-01-09
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Granted: 1975-12-16
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Expires: 1994-01-09
Abstract
Abstract High strength low alloy steels having lower yield strengths in the range of from 50,000 psi to 80,000 psi and superior formability properties are disclosed.
Inventors
- 👤 William E Creswick
- 👤 Patrick J Hunt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:06
CPC Classifications
C; C21; C21D; C21D8/00; C21D8/02; C21D8/04; C21D8/0421; C21D8/0426; C22; C22C; C22C38/00; C22C38/12
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
93 words
A METHOD OF MAKING A HIGH STRENGTH LOW ALLOY STEEL STRIP HAVING A MINIMUM YIELD STRENGTH OF 50,000 PSI AND GOOD FORMABILITY PROPERITIES WHICH COMPRISES SUBJECTING A SLAB OF STEEL HAVING A COMPOSITION CONSISTING ESSENTIALLY OF, BY WEIGHT, 0.10 PERCENT MAXIMUM CARBON, 0.30 TO 0.80 PERCENT MANGANESE 0.02 PERCENT MAXIMUM SULPHUR, 0.06 PERCENT ALUMINUM, 0.01 TO 0L02 COLUMBIUM, 0.06 PERCENT MAXIMUM CERIUM, THE BALANCE BEING IRON AND INCIDENTAL IMPURITIES, TO A HOT-ROLLED FINISHING TEMPERATURE IN THE RANGE OF 1620* T0 1670*F AND COLLECTING THE STRIP IN A TEMPERATURE RANGE OF 1325* TO 1375*F.
Claim 2
Independent Claim
93 words
A METHOD OF MAKING A HIGH STRENGTH LOW ALLOY STEEL STRIP HAVING A MINIMUM YIELD STRENGTH OF 50,000 PSI AND GOOD FORMABILITY PROPERITIES WHICH COMPRISES SUBJECTING A SLAB OF STEEL HAVING A COMPOSITION CONSISTING ESSENTIALLY OF, BY WEIGHT, 0.10 PERCENT MAXIMUM CARBON, 0.30 TO 0.80 PERCENT MANGANESE 0.02 PERCENT MAXIMUM SULPHUR, 0.06 PERCENT ALUMINUM, 0.01 TO 0L02 COLUMBIUM, 0.06 PERCENT MAXIMUM CERIUM, THE BALANCE BEING IRON AND INCIDENTAL IMPURITIES, TO A HOT-ROLLED FINISHING TEMPERATURE IN THE RANGE OF 1620* T0 1670*F AND COLLECTING THE STRIP IN A TEMPERATURE RANGE OF 1325* TO 1375*F.
Claim 3
Independent Claim
95 words
A method of making a high strength low alloy steel strip having a minimum yield strength of 60,000 psi and good formability properties which comprises subjecting a slab of steel having a composition consisting essentially of, by weight, 0.10 percent maximum carbon, 0.30 to 0.80 percent manganese, 0.02 percent maximum sulphur, 0.02 to 0.06 percent aluminum, 0.03 to 0.04 percent columbium, 0.06 percent maximum cerium, the balance being iron and incidental impurities, to a hot-rolled finishing temperature in the range of 1620*to 1670*F and collecting the strip in a temperature range of 1250* to 1300*F.
Claim 4
Independent Claim
95 words
A method of making a high strength low alloy steel strip having a minimum yield strength of 60,000 psi and good formability properties which comprises subjecting a slab of steel having a composition consisting essentially of, by weight, 0.10 percent maximum carbon, 0.30 to 0.80 percent manganese, 0.02 percent maximum sulphur, 0.02 to 0.06 percent aluminum, 0.03 to 0.04 percent columbium, 0.06 percent maximum cerium, the balance being iron and incidental impurities, to a hot-rolled finishing temperature in the range of 1620*to 1670*F and collecting the strip in a temperature range of 1250* to 1300*F.
Claim 5
Independent Claim
95 words
A method of making a high strength low alloy steel strip having a minimum yield strength of 70,000 psi good formability properties which comprises subjecting a slab of steel having a composition consisting essentially of, by weight, 0.10 percent maximum carbon, 0.30 to 0.80 percent manganese, 0.02 percent maximum sulphur, 0.02 to 0.06 percent aluminum, 0.06 to 0.08 percent columbium, 0.06 maximum cerium, the balance being iron and incidental impurities, to a hot-rolled finishing temperature in the range of 1650*F to 1700*F and collecting the strip in a temperature range of 1200* to 1250 *F.
Claim 6
Independent Claim
95 words
A method of making a high strength low alloy steel strip having a minimum yield strength of 70,000 psi good formability properties which comprises subjecting a slab of steel having a composition consisting essentially of, by weight, 0.10 percent maximum carbon, 0.30 to 0.80 percent manganese, 0.02 percent maximum sulphur, 0.02 to 0.06 percent aluminum, 0.06 to 0.08 percent columbium, 0.06 maximum cerium, the balance being iron and incidental impurities, to a hot-rolled finishing temperature in the range of 1650*F to 1700*F and collecting the strip in a temperature range of 1200* to 1250 *F.
Claim 7
Independent Claim
96 words
A method of making a high strength low alloy steel strip having a minimum yield strength of 80,000 psi and good formability properties which comprises subjeCting a slab of steel having a composition consisting essentially of, by weight, 0.10 percent maximum carbon, 0.30 to 0.80 percent manganese, 0.02 percent maximum sulphur, 0.02 to 0.06 percent aluminum, 0.10 to 0.12 percent columbium, 0.06 percent maximum cerium, the balance being iron and incidental impurities, to a hot-rolled finishing temperature in the range of 1650*F to 1700*F and collecting the strip in a temperature range of 1150* to 1200*F.
Claim 8
Independent Claim
96 words
A method of making a high strength low alloy steel strip having a minimum yield strength of 80,000 psi and good formability properties which comprises subjeCting a slab of steel having a composition consisting essentially of, by weight, 0.10 percent maximum carbon, 0.30 to 0.80 percent manganese, 0.02 percent maximum sulphur, 0.02 to 0.06 percent aluminum, 0.10 to 0.12 percent columbium, 0.06 percent maximum cerium, the balance being iron and incidental impurities, to a hot-rolled finishing temperature in the range of 1650*F to 1700*F and collecting the strip in a temperature range of 1150* to 1200*F.
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) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |