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US5238482A
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Prealloyed high-vanadium, cold work tool steel particles and methods for producing the same
Assignee: Crucible Industries LLC
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Filing: 1991-05-22
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Granted: 1993-08-24
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Expires: 2011-05-22
Abstract
Abstract Prealloyed high-vanadium, cold work tool steel particles are provided for use in the powder-metallurgy production of tool steel articles. The particles are of a cold work tool steel alloy having an MC-type vanadium carbide dispersion of a carbide particle size substantially entirely less than 6 microns and in an amount of 18.5 to 34.0% by volume. The particles are produced by atomizing a molten tool steel alloy at a temperature above 2910° F. and rapidly cooling the atomized alloy to form solidified particles therefrom. The particles have the MC-type vanadium carbide dispersion therein.
Inventors
- 👤 William Stasko
- 👤 Kenneth E. Pinnow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:49
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0278; C22C33/0292; Y; Y10; Y10S; Y10S75/00; Y10S75/956
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
88 words
A method for producing prealloyed cold work tool steep particles for use in the powder-metallurgy production of tool steel articles, said method comprising atomizing a molten tool steel alloy at a temperature above 2910° F. and rapidly cooling said atomized alloy to form said particles, with said particles having an MC vanadium carbide dispersion therein of a carbide particle size substantially entirely less than 6 microns and in an amount of 18.5 to 34.0% by volume, wherein a grindability index, as defined herein, above about 0.7 is achieved.
Claim 2
Independent Claim
88 words
A method for producing prealloyed cold work tool steep particles for use in the powder-metallurgy production of tool steel articles, said method comprising atomizing a molten tool steel alloy at a temperature above 2910° F. and rapidly cooling said atomized alloy to form said particles, with said particles having an MC vanadium carbide dispersion therein of a carbide particle size substantially entirely less than 6 microns and in an amount of 18.5 to 34.0% by volume, wherein a grindability index, as defined herein, above about 0.7 is achieved.
Claim 3
Dependent Claim
16 words
The method of claim 1 wherein said temperature is above 2910° F. to about 3250° F.
Claim 4
Dependent Claim
16 words
The method of claim 1 wherein said temperature is above 2910° F. to about 3020° F.
Claim 5
Dependent Claim
16 words
The method of claim 1 wherein said temperature is about 2950° F. to about 3250° F.
Claim 6
Independent Claim
21 words
The method of claims 1, 2, 3, or 4, wherein said carbide particle size is substantially entirely less than 4 microns.
Claim 7
Independent Claim
15 words
The method of claims 1, 2, 3, or 4, wherein said atomizing is gas atomization.
Claim 8
Dependent Claim
77 words
The method of claim 1 wherein said cold work tool steel alloy consists essentially of, in weight percent, 2.6 to 4.70 carbon, up to 0.15 nitrogen, 0.2 to 2.0 manganese, up to 2.0 silicon, 1.5 to 6.0 chromium, up to 6.0 molybdenum, up to 0.30 sulfur, 11.5 to 20.0 vanadium and balance iron and incidental impurities, wherein the carbon and nitrogen are balanced according to the formulas, percent (C+N).sub.minimum =0.30+0.20 (% V) percent (C+N).sub.maximum =0.70+0.20 (% V).
Claim 9
Dependent Claim
76 words
The method of claim 1 wherein said cold work tool steel alloy consists essentially of, in weight percent, 2.7 to 4.30 carbon, up to 0.15 nitrogen, 0.2 to 1.0 manganese, up to 2.0 silicon, 4.0 to 6.0 chromium, 0.5 to 2.0 molybdenum, up to 0.10 sulfur, 12.0 to 18.0 vanadium and balance iron and incidental impurities, wherein carbon and nitrogen are balanced according to the formulas, percent (C+N).sub.minimum =0.30+0.20 (% V) percent (C+N).sub.maximum =0.70+0.20 (% V).
Claim 10
Dependent Claim
76 words
The method of claim 1 wherein said cold work tool steel alloy consists essentially of, in weight percent, 2.7 to 3.90 carbon, up to 0.15 nitrogen, 0.2 to 1.0 manganese, up to 2.0 silicon, 4.5 to 5.5 chromium, 0.5 to 2.0 molybdenum, up to 0.10 sulfur, 12.0 to 16.0 vanadium and balance iron and incidental impurities, wherein carbon and nitrogen are balanced according to the formulas, percent (C+N).sub.minimum =0.30+0.20 (% V) percent (C+N).sub.maximum =0.70+0.20 (% V).
Claim 11
Dependent Claim
77 words
The method of claim 2 wherein said cold work tool steel alloy consists essentially of, in weight percent, 2.6 to 4.70 carbon, up to 0.15 nitrogen, 0.2 to 2.0 manganese, up to 2.0 silicon, 1.5 to 6.0 chromium, up to 6.0 molybdenum, up to 0.30 sulfur, 11.5 to 20.0 vanadium and balance iron and incidental impurities, wherein the carbon and nitrogen are balanced according to the formulas, percent (C+N).sub.minimum =0.30+0.20 (% V) percent (C+N).sub.maximum =0.70+0.20 (% V).
Claim 12
Dependent Claim
76 words
The method of claim 2 wherein said cold work tool steel alloy consists essentially of, in weight percent, 2.7 to 4.30 carbon, up to 0.15 nitrogen, 0.2 to 1.0 manganese, up to 2.0 silicon, 4.0 to 6.0 chromium, 0.5 to 2.0 molybdenum, up to 0.10 sulfur, 12.0 to 18.0 vanadium and balance iron and incidental impurities, wherein carbon and nitrogen are balanced according to the formulas, percent (C+N).sub.minimum =0.30+0.20 (% V) percent (C+N).sub.maximum =0.70+0.20 (% V).
Claim 13
Dependent Claim
76 words
The method of claim 3 wherein said cold work tool steel alloy consists essentially of, in weight percent, 2.7 to 3.90 carbon, up to 0.15 nitrogen, 0.2 to 1.0 manganese, up to 2.0 silicon, 4.5 to 5.5 chromium, 0.5 to 2.0 molybdenum, up to 0.10 sulfur, 12.0 to 16.0 vanadium and balance iron and incidental impurities, wherein carbon and nitrogen are balanced according to the formulas, percent (C+N).sub.minimum =0.30+0.20 (% V) percent (C+N).sub.maximum =0.70+0.20 (% V).
Claim 14
Dependent Claim
72 words
The method of claim 3 wherein said cold work tool steel alloy consists essentially of, in weight percent, 2.6 to 4.70 carbon, up to 0.15 nitrogen, 0.2 to 2.0 manganese, up to 2.0 silicon, 1.5 to 6.0 chromium, up to 6.0 molybdenum, up to 0.30 sulfur, 11.5 to 20.0 vanadium and balance iron and incidental impurities, wherein the carbon and nitrogen are percent (C+N).sub.minimum =0.30+0.20 (% V) percent (C+N).sub.maximum =0.70+0.20 (% V).
Claim 15
Dependent Claim
76 words
The method of claim 3 wherein said cold work tool steel alloy consists essentially of, in weight percent, 2.7 to 4.30 carbon, up to 0.15 nitrogen, 0.2 to 1.0 manganese, up to 2.0 silicon, 4.0 to 6.0 chromium, 0.5 to 2.0 molybdenum, up to 0.10 sulfur, 12.0 to 18.0 vanadium and balance iron and incidental impurities, wherein carbon and nitrogen are balanced according to the formulas, percent (C+N).sub.minimum =0.30+0.20 (% V) percent (C+N).sub.maximum =0.70+0.20 (% V).
Claim 16
Dependent Claim
76 words
The method of claim 3 wherein said cold work tool steel alloy consists essentially of, in weight percent, 2.7 to 3.90 carbon, up to 0.15 nitrogen, 0.2 to 1.0 manganese, up to 2.0 silicon, 4.5 to 5.5 chromium, 0.5 to 2.0 molybdenum, up to 0.10 sulfur, 12.0 to 16.0 vanadium and balance iron and incidental impurities, wherein carbon and nitrogen are balanced according to the formulas, percent (C+N).sub.minimum =0.30+0.20 (% V) percent (C+N).sub.maximum =0.70+0.20 (% V).
Claim 17
Dependent Claim
77 words
The method of claim 4 wherein said cold work tool steel alloy consists essentially of, in weight percent, 2.6 to 4.70 carbon, up to 0.15 nitrogen, 0.2 to 2.0 manganese, up to 2.0 silicon, 1.5 to 6.0 chromium, up to 6.0 molybdenum, up to 0.30 sulfur, 11.5 to 20.0 vanadium and balance iron and incidental impurities, wherein the carbon and nitrogen are balanced according to the formulas, percent (C+N).sub.minimum =0.30+0.20 (% V) percent (C+N).sub.maximum =0.70+0.20 (% V).
Claim 18
Dependent Claim
76 words
The method of claim 4 wherein said cold work tool steel alloy consists essentially of, in weight percent, 2.7 to 4.30 carbon, up to 0.15 nitrogen, 0.2 to 1.0 manganese, up to 2.0 silicon, 4.0 to 6.0 chromium, 0.5 to 2.0 molybdenum, up to 0.10 sulfur, 12.0 to 18.0 vanadium and balance iron and incidental impurities, wherein carbon and nitrogen are balanced according to the formulas, percent (C+N).sub.minimum =0.30+0.20 (% V) percent (C+N).sub.maximum =0.70+0.20 (% V).
Claim 19
Dependent Claim
76 words
The method of claim 4 wherein said cold work tool steel alloy consists essentially of, in weight percent, 2.7 to 3.90 carbon, up to 0.15 nitrogen, 0.2 to 1.0 manganese, up to 2.0 silicon, 4.5 to 5.5 chromium, 0.5 to 2.0 molybdenum, up to 0.10 sulfur, 12.0 to 16.0 vanadium and balance iron and incidental impurities, wherein carbon and nitrogen are balanced according to the formulas, percent (C+N).sub.minimum =0.30+0.20 (% V) percent (C+N).sub.maximum =0.70+0.20 (% V).
Claim 20
Dependent Claim
77 words
The method of claim 5 wherein said cold work tool steel alloy consists essentially of, in weight percent, 2.6 to 3.90 carbon, up to 0.15 nitrogen, 0.2 to 2.0 manganese, up to 2.0 silicon, 1.5 to 6.0 chromium, up to 6.0 molybdenum, up to 0.30 sulfur, 11.5 to 20.0 vanadium and balance iron and incidental impurities, wherein the carbon and nitrogen are balanced according to the formulas, percent (C+N).sub.minimum =0.30+0.20 (% V) percent (C+N).sub.maximum =0.70+0.20 (% V).
Claim 21
Dependent Claim
76 words
The method of claim 5 wherein said cold work tool steel alloy consists essentially of, in weight percent, 2.7 to 4.30 carbon, up to 0.15 nitrogen, 0.2 to 1.0 manganese, up to 2.0 silicon, 4.0 to 6.0 chromium, 0.5 to 2.0 molybdenum, up to 0.10 sulfur, 12.0 to 18.0 vanadium and balance iron and incidental impurities, wherein carbon and nitrogen are balanced according to the formulas, percent (C+N).sub.minimum =0.30+0.20 (% V) percent (C+N).sub.maximum =0.70+0.20 (% V).
Claim 22
Dependent Claim
76 words
The method of claim 3 wherein said cold work tool steel alloy consists essentially of, in weight percent, 2.7 to 3.90 carbon, up to 0.15 nitrogen, 0.2 to 1.0 manganese, up to 2.0 silicon, 4.5 to 5.5 chromium, 0.5 to 2.0 molybdenum, up to 0.10 sulfur, 12.0 to 16.0 vanadium and balance iron and incidental impurities, wherein carbon and nitrogen are balanced according to the formulas, percent (C+N).sub.minimum =0.30+0.20 (% V) percent (C+N).sub.maximum =0.70+0.20 (% V).
Claim 23
Independent Claim
76 words
The method of claim said cold work tool steel alloy consists essentially of, in weight percent, 2 6 to 4.70 carbon, up to 0.15 nitrogen, 0.2 to 2.0 manganese, up to 2.0 silicon, 1.5 to 6.0 chromium, up to 6.0 molybdenum, up to 0.30 sulfur, 11.5 to 20.0 vanadium and balance iron and incidental impurities, wherein the carbon and nitrogen are balanced according to the formulas, percent (C+N).sub.minimum =0.30+0.20 (% V) percent (C+N).sub.maximum =0.70+0.20 (% V).
Claim 24
Dependent Claim
76 words
The method of claim 6 wherein said cold work tool steel alloy consists essentially of, in weight percent, 2.7 to 4.30 carbon, up to 0.15 nitrogen, 0.2 to 1.0 manganese, up to 2.0 silicon, 4.0 to 6.0 chromium, 0.5 to 2.0 molybdenum, up to 0.10 sulfur, 12.0 to 18.0 vanadium and balance iron and incidental impurities, wherein carbon and nitrogen are balanced according to the formulas, percent (C+N).sub.minimum =0.30+0.20 (% V) percent (C+N).sub.maximum =0.70+0.20 (% V).
Claim 25
Dependent Claim
76 words
The method of claim 6 wherein said cold work tool steel alloy consists essentially of, in weight percent, 2.7 to 3.90 carbon, up to 0.15 nitrogen, 0.2 to 1.0 manganese, up to 2.0 silicon, 4.5 to 5.5 chromium, 0.5 to 2.0 molybdenum, up to 0.10 sulfur, 12.0 to 16.0 vanadium and balance iron and incidental impurities, wherein carbon and nitrogen are balanced according to the formulas, percent (C+N).sub.minimum =0.30+0.20 (% V) percent (C+N).sub.maximum =0.70+0.20 (% V).
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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