US4119445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High strength alloy of ferritic structure
Assignee: Jones and Laughlin Steel Inc
•
Filing: 1973-06-29
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Granted: 1978-10-10
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Expires: 1993-06-29
Abstract
Abstract Low alloy high strength titanium steel and a process for preparing said steel by solution heat treating and thereafter controlling the cooling rate to the precipitation hardening temperature range required to produce a steel characterized by a yield strength in the range of 60,000 to 120,000 psi and/or by a bendability characteristic demonstrable by a capability of being bent through an arc without cracking to an inside diameter equal to the thickness of the product.
Inventors
- 👤 Richard A. Bosch
- 👤 John A. Straatmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:02
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/14
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
105 words
A killed ferrous low alloy flat rolled product of a composition consisting essentially of, in percentage by weight, 0.03-0.20 carbon, 0.04-0.35 titanium as a primary strengthening agent, 0.02-0.07 killing agent selected from the group consisting of aluminum, silicon, additional titanium, and zirconium, up to 1.5 manganese, 0.03 maximum sulfur, 0.015 maximum phosphorus, up to 0.30 silicon, up to 0.01 nitrogen, the remainder being essentially iron, and characterized by: a fine dispersion of titanium carbonitride in a ferrite matrix, and a cold formability demonstrable by a capability of being bent through an arc, without cracking, to an inside diameter equal to the thickness of the product.
Claim 2
Dependent Claim
105 words
A killed ferrous low alloy flat rolled product of a composition consisting essentially of, in percentage by weight, 0.03-0.20 carbon, 0.04-0.35 titanium as a primary strengthening agent, 0.02-0.07 killing agent selected from the group consisting of aluminum, silicon, additional titanium, and zirconium, up to 1.5 manganese, 0.03 maximum sulfur, 0.015 maximum phosphorus, up to 0.30 silicon, up to 0.01 nitrogen, the remainder being essentially iron, and characterized by: a fine dispersion of titanium carbonitride in a ferrite matrix, and a cold formability demonstrable by a capability of being bent through an arc, without cracking, to an inside diameter equal to the thickness of the product.
Claim 3
Dependent Claim
23 words
A product as described in claim 1, which is further characterized by: a yield strength in the range of 60,000 to 120,000 psi.
Claim 4
Dependent Claim
27 words
A product, as described in claim 1, which exhibits: an elongation greater than 20 percent in 2 inches and a reduction in area greater than 50 percent.
Claim 5
Dependent Claim
20 words
A product, as described in claim 1, which is further characterized by a yield strength of at least 46,600 psi.
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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) | 1981-10-09 | 1982-04-10 | 1982-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-09 | 1986-04-10 | 1986-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-09 | 1990-04-10 | 1990-10-10 | $7700.00 | Window Closed / Lapsed |