US3330705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method to improve impact properties of steels
Assignee: Inland Steel Co
•
Filing: 1966-11-17
•
Granted: 1967-07-11
•
Expires: 1986-11-17
Abstract
No abstract record available.
Inventors
- 👤 Edmund S Madrzyk
- 👤 Joseph F Collins
- 👤 Kramer Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:28
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/04; C21; C21D; C21D8/00; C21D6/00; C21D6/005; C21D8/02; C21D8/0221; C21D8/0226; C22C38/02; C21D2211/00; C21D2211/001; C21D2211/005; C21D2211/008
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
175 words
A METHOD FOR TREATING A HYPOEUTECTOID STEEL, SAID METHOD COMPRISING THE STEPS OF: SOAKING SAID STEEL AT TEMPERATURE, IN THE AUSTENITIC REGION BUT BELOW THE GRAIN-COARSENING TEMPERATURE FOR SAID STEEL, AND FOR A TIME WHICH PRODUCES GRAIN RECRYSTALLIZATION WITHOUT SUBSTANTIAL GRAIN GROWTH FOR SAID STEEL; COOLING SAID STEEL TO A LOWER TEMPERATURE, IN THE FERRITE PLUS AUSTENITE REGION FOR SAID STEEL AND AT WHICH THE MICROSTRUCTURE OF THE STEEL CONTAINS BOTH FERRITE AND AUSTENITE; SAID LOWER TEMPERATURE BEING MATERIALLY ABOVE THE A1 TEMPERATURE FOR SAID STEEL; DEFORMING SAID STEEL AT SAID LOWER TEMPERATURE AFTER SAID COOLING STEP; SAID DEFORMING STEP BEING INITIATED WHEN THE MICROSTRUCTURE OF THE STEEL CONTAINS BOTH FERRITE AND AUSTENITE; CONTROLLING SAID LOWER TEMPERATURE AND SAID DEFORMATION TO PRODUCE FINE-GRAIN FERRITE RECRYSTALLIZATION WITHOUT SUBSTANTIAL FERRITIC GRAIN GROWTH AS A RESULT OF SAID DEFORMATION AT SAID LOWER TEMPERATURE; AND THEN COOLING SAID STEEL TO ROOM TEMPERATURE WITHOUT FURTHER DEFORMING OR HEAT-TREATING; SAID STEEL BEING AT A TEMPERATURE IN THE FERRITE PLUS AUSTENITE REGION FOR THE STEEL WHEN SAID LAST-RECITED COOLING STEP IS INITITATED.
Claim 2
Independent Claim
175 words
A METHOD FOR TREATING A HYPOEUTECTOID STEEL, SAID METHOD COMPRISING THE STEPS OF: SOAKING SAID STEEL AT TEMPERATURE, IN THE AUSTENITIC REGION BUT BELOW THE GRAIN-COARSENING TEMPERATURE FOR SAID STEEL, AND FOR A TIME WHICH PRODUCES GRAIN RECRYSTALLIZATION WITHOUT SUBSTANTIAL GRAIN GROWTH FOR SAID STEEL; COOLING SAID STEEL TO A LOWER TEMPERATURE, IN THE FERRITE PLUS AUSTENITE REGION FOR SAID STEEL AND AT WHICH THE MICROSTRUCTURE OF THE STEEL CONTAINS BOTH FERRITE AND AUSTENITE; SAID LOWER TEMPERATURE BEING MATERIALLY ABOVE THE A1 TEMPERATURE FOR SAID STEEL; DEFORMING SAID STEEL AT SAID LOWER TEMPERATURE AFTER SAID COOLING STEP; SAID DEFORMING STEP BEING INITIATED WHEN THE MICROSTRUCTURE OF THE STEEL CONTAINS BOTH FERRITE AND AUSTENITE; CONTROLLING SAID LOWER TEMPERATURE AND SAID DEFORMATION TO PRODUCE FINE-GRAIN FERRITE RECRYSTALLIZATION WITHOUT SUBSTANTIAL FERRITIC GRAIN GROWTH AS A RESULT OF SAID DEFORMATION AT SAID LOWER TEMPERATURE; AND THEN COOLING SAID STEEL TO ROOM TEMPERATURE WITHOUT FURTHER DEFORMING OR HEAT-TREATING; SAID STEEL BEING AT A TEMPERATURE IN THE FERRITE PLUS AUSTENITE REGION FOR THE STEEL WHEN SAID LAST-RECITED COOLING STEP IS INITITATED.
References Cited (Backward Citations)
GB647797A
Cited
US3102831A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-07-10 | 1971-01-09 | 1971-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-10 | 1975-01-09 | 1975-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-10 | 1979-01-09 | 1979-07-11 | $7700.00 | Window Closed / Lapsed |