Patent US3936299A successfully refreshed from Google Patents.
US3936299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing tool steel articles
Assignee: Crucible Materials Corp
•
Filing: 1971-09-14
•
Granted: 1976-02-03
•
Expires: 1991-09-14
Abstract
Abstract This invention relates to a tool steel consisting essentially of, in weight percent, carbon 1 to 1.4 or 2.5, chromium 4 to 6, vanadium 1 to 1.5 or 8, tungsten 7.5 to 13, molybdenum 3.5 to 7, cobalt 9 to 15, nitrogen at least about 0.03 and preferably 0.03 to 0.08, and the balance iron. The invention also relates to a tool steel compact of this steel produced by a powder-metallurgy technique also in accordance with this invention. The tool steel article is characterized by a combination of good cutting performance and machinability.
Inventors
- 👤 Gary Steven
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:59
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/52; C22C33/00; C22C33/02; C22C33/0257; C22C33/0278; C22C33/0285; C22C38/12; C22C38/44; C22C38/46
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
86 words
A method for producing a tool steel article characterized by fine, globular, evenly dispersed carbides, and a combination of good cutting performance and machinability comprising compacting a powdered alloy charge of the following composition, in weight percent:Carbon 1 to 2.5Chromium 4 to 6Vanadium 1 to 8Tungsten 7.5 to 13Molybdenum 3.5 to 7Cobalt 9 to 15Nitrogen At least about .03Iron Balance said compacting being conducted after heating said charge and with said charge at elevated temperature to produce a compact of a density greater than about 95%.
Claim 2
Independent Claim
86 words
A method for producing a tool steel article characterized by fine, globular, evenly dispersed carbides, and a combination of good cutting performance and machinability comprising compacting a powdered alloy charge of the following composition, in weight percent:Carbon 1 to 2.5Chromium 4 to 6Vanadium 1 to 8Tungsten 7.5 to 13Molybdenum 3.5 to 7Cobalt 9 to 15Nitrogen At least about .03Iron Balance said compacting being conducted after heating said charge and with said charge at elevated temperature to produce a compact of a density greater than about 95%.
Claim 3
Dependent Claim
17 words
The method of claim 1 wherein said alloy has a nitrogen content of about 0.03 to 0.08%.
Claim 4
Dependent Claim
61 words
The method of claim 1 wherein prior to compacting said powdered alloy charge is placed in a gas-tight container, said container and charge are heated to an elevated temperature in excess of about 2000°F, the container is pumped to remove gaseous reaction products resulting from said heating and said compacting is completed prior to cooling of said charge below about 1900°F.
Claim 5
Dependent Claim
36 words
The method of claim 3 wherein, after removal of said gaseous reaction products and prior to compacting, nitrogen in gaseous form is introduced to said container to provide said nitrogen content of at least about 0.03%.
Claim 6
Dependent Claim
24 words
The method of claim 1 wherein said alloy has a vanadium content of 1 to 1.5% and a carbon content of 1 to 2.5%.
Claim 7
Independent Claim
118 words
A method for producing a tool steel article characterized by fine, globular, evenly dispersed carbides, and a combination of good cutting performance and machinability comprising placing in a gas-tight container a powdered metal charge of the following composition, in weight percent: Carbon 1 to 1.4
Chromium 4 to 6
Vanadium 1 to 1.5
Tungsten 7.5 to 13
Molybdenum 3.5 to 7
Cobalt 9 to 15
Nitrogen .03 to .08
Iron Balance heating said container and charge to an elevated temperature in excess of about 2000°F, removing from said container gaseous reaction products resulting from said heating and compacting said charge to a density greater than about 95% prior to said charge cooling below a temperature of about 1900°F.
Claim 8
Independent Claim
118 words
A method for producing a tool steel article characterized by fine, globular, evenly dispersed carbides, and a combination of good cutting performance and machinability comprising placing in a gas-tight container a powdered metal charge of the following composition, in weight percent: Carbon 1 to 1.4
Chromium 4 to 6
Vanadium 1 to 1.5
Tungsten 7.5 to 13
Molybdenum 3.5 to 7
Cobalt 9 to 15
Nitrogen .03 to .08
Iron Balance heating said container and charge to an elevated temperature in excess of about 2000°F, removing from said container gaseous reaction products resulting from said heating and compacting said charge to a density greater than about 95% prior to said charge cooling below a temperature of about 1900°F.
References Cited (Backward Citations)
US3341325A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-02 | 1979-08-04 | 1980-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-02 | 1983-08-04 | 1984-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-02 | 1987-08-04 | 1988-02-03 | $7700.00 | Window Closed / Lapsed |