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Title: Method for producing tool steel articles
Claims: I claim: 1. 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 2.5 Chromium 4 to 6 Vanadium 1 to 8 Tungsten 7.5 to 13 Molybdenum 3.5 to 7 Cobalt 9 to 15 Nitrogen At least about .03 Iron 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%. 2. The method of claim 1 wherein said alloy has a nitrogen content of about 0.03 to 0.08%. 3. 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.degree.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.degree.F. 4. 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%. 5. 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%. 6. 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.degree.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.degree.F. Other info: Inventors: Steven, Gary (Pittsburgh, PA, US) Application Number: 180412 Filing Date: 1971-09-14 Publication_date: 1976-02-03 Assignee: Crucible Inc. (Pittsburgh, PA) Primary Class(es): 419/48 419/44, 419/57 Other Classes: US Patent Ref:
Other Refs: Other References: Roberts et al., "Tool Steels," 3rd Ed., ASM, 1962, p. 719. | |