US4032302A
Expired / Lapsed
US
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Carbide enriched high speed tool steel
Assignee: Proterial Ltd
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Filing: 1975-12-16
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Granted: 1977-06-28
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Expires: 1995-12-16
Abstract
Abstract A carbide enriched high speed tool steel having good toughness, excellent wear resistance and excellent cutting endurance which by weight consists essentially of 0.62 - 3.95 % of carbon, totally 24 - 50 % of tungsten and twice amount of molybdenum, 3.0 - 5.0 % of chromium, 1.0 - 10.0 % of vanadium, 5 - 15 % of cobalt and the balance consisting essentially of iron and impurities and which is produced by powder metallurgical process.
Inventors
- 👤 Hideki Nakamura
- 👤 Kingo Kiyonaga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:47
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0278; C22C33/0292
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
99 words
A high speed tool steel enriched with at least 24% of carbides in the quenched state, which consists essentially of, by weight, 0.62- 3.95% of carbon, 24- 50% of a tungsten equivalent that is the sum of the content of tungsten and twice the content of molybdenum, 3.0- 5.0% of chromium, 1.0- 10.0% of vanadium, 5- 15% of cobalt and the balance consisting essentially of iron and impurities and which is produced by a powder metallurgical process that includes preparing an alloy powder and compacting of the powder, said carbides including the MC and M 6 C type carbides.
Claim 2
Dependent Claim
99 words
A high speed tool steel enriched with at least 24% of carbides in the quenched state, which consists essentially of, by weight, 0.62- 3.95% of carbon, 24- 50% of a tungsten equivalent that is the sum of the content of tungsten and twice the content of molybdenum, 3.0- 5.0% of chromium, 1.0- 10.0% of vanadium, 5- 15% of cobalt and the balance consisting essentially of iron and impurities and which is produced by a powder metallurgical process that includes preparing an alloy powder and compacting of the powder, said carbides including the MC and M 6 C type carbides.
Claim 3
Dependent Claim
43 words
A high speed tool steel according to claim 1, wherein the carbon content is 0.67- 2.05%, the sum of the tungsten content and twice the molybdenum content is 24- 30%, the vanadium content is 1.0- 4.0% and the cobalt content is 5- 13%.
Claim 4
Dependent Claim
44 words
A high speed tool steel according to claim 1, wherein the carbon content is 1.27- 3.55%, the sum of the tungsten content and twice the molybdenum content is 24- 30% and the vanadium content is 4.0- 10.0% and the cobalt content is 5- 13%.
Claim 5
Dependent Claim
43 words
A high speed tool steel according to claim 1, wherein the carbon content is 0.87- 2.68%, the sum of the tungsten content and twice the molybdenum content is 30- 50%, the vanadium content is 1.0- 4.0% and the cobalt content is 5- 13%.
Claim 6
Dependent Claim
43 words
A high speed tool steel according to claim 1, wherein the carbon content is 1.47- 3.88%, the sum of the tungsten content and twice the molybdenum content is 30- 50%, the vanadium content is 4.0- 10.0% and the cobalt content is 5- 13%.
Claim 7
Dependent Claim
103 words
A high speed tool steel enriched with at least 24% of carbides in the quenched state, which consists essentially of, by weight, 0.62- 3.95% of carbon, 24- 50% of a tungsten equivalent that is the sum of the content of tungsten and twice the content of molybdenum, 3.0- 5.0% of chromium, 1.0- 10.0% of vanadium, 5- 15% of cobalt, 0.03- 0.07% of nitrogen and the balance consisting essentially of iron and impurities and which is produced by a powder metallurgical process that includes preparing an alloy powder and compacting of the powder, said carbides including the MC and M 6 C type carbides.
Claim 8
Dependent Claim
103 words
A high speed tool steel enriched with at least 24% of carbides in the quenched state, which consists essentially of, by weight, 0.62- 3.95% of carbon, 24- 50% of a tungsten equivalent that is the sum of the content of tungsten and twice the content of molybdenum, 3.0- 5.0% of chromium, 1.0- 10.0% of vanadium, 5- 15% of cobalt, 0.03- 0.07% of nitrogen and the balance consisting essentially of iron and impurities and which is produced by a powder metallurgical process that includes preparing an alloy powder and compacting of the powder, said carbides including the MC and M 6 C type carbides.
Claim 9
Dependent Claim
104 words
A high speed tool steel enriched with at least 24% of carbides in the quenched state, which consists essentially of, by weight 0.62- 3.95% of carbon, 24- 50% of a tungsten equivalent that is the sum of the content of tungsten and twice the content of molybdenum, 3.0- 5.0% of chromium, 1.0- 10.0 % of vanadium, 5- 15% of cobalt, 0.03- 0.15% of titanium and the balance consisting essentially of iron and impurities and which is produced by a powder metallurgical process that includes preparing an alloy powder and compacting of the powder, said carbides including the MC and M 6 C type carbides.
Claim 10
Dependent Claim
104 words
A high speed tool steel enriched with at least 24% of carbides in the quenched state, which consists essentially of, by weight 0.62- 3.95% of carbon, 24- 50% of a tungsten equivalent that is the sum of the content of tungsten and twice the content of molybdenum, 3.0- 5.0% of chromium, 1.0- 10.0 % of vanadium, 5- 15% of cobalt, 0.03- 0.15% of titanium and the balance consisting essentially of iron and impurities and which is produced by a powder metallurgical process that includes preparing an alloy powder and compacting of the powder, said carbides including the MC and M 6 C type carbides.
Claim 11
Dependent Claim
107 words
A high speed tool steel enriched with at least 24% of carbides in the quenched state, which consists essentially of, by weight, 0.62- 3.95% of carbon, 24- 50% of a tungsten equivalent that is the sum of the content of tungsten and twice the content of molybdenum, 3.0- 5.3% of chromium, 1.0- 10.0% of vanadium, 5- 15% of cobalt, 0.03- 0.07% of nitrogen, 0.03- 0.15% of titanium and the balance consisting essentially of iron and impurities and which is produced by a powder metallurgical process that includes preparing an alloy powder and compacting of the powder, said carbides including the MC and M 6 C type carbides.
Claim 12
Dependent Claim
107 words
A high speed tool steel enriched with at least 24% of carbides in the quenched state, which consists essentially of, by weight, 0.62- 3.95% of carbon, 24- 50% of a tungsten equivalent that is the sum of the content of tungsten and twice the content of molybdenum, 3.0- 5.3% of chromium, 1.0- 10.0% of vanadium, 5- 15% of cobalt, 0.03- 0.07% of nitrogen, 0.03- 0.15% of titanium and the balance consisting essentially of iron and impurities and which is produced by a powder metallurgical process that includes preparing an alloy powder and compacting of the powder, said carbides including the MC and M 6 C type carbides.
Claim 13
Dependent Claim
49 words
A high speed tool steel according to claim 1, wherein the carbon content is about 1.3%, the sum of the tungsten content and twice the molybdenum content is about 24.5%, the chromium content is about 3.6%, the vanadium content is about 3.5% and the cobalt content is about 8.4%.
Claim 14
Dependent Claim
23 words
A cutting tool having good toughness and excellent wear resistance and cutting endurance, which comprises the high speed tool steel of claim 1.
Claim 15
Dependent Claim
29 words
A high speed tool steel according to claim 1, wherein said steel has a deflective strength of at least 170 Kg/mm 2 and a hardness of at least 67HRC.
Claim 16
Dependent Claim
29 words
A high speed tool steel according to claim 6, wherein said steel has a deflective strength of at least 170 Kg/mm 2 and a hardness of at least 67HRC.
Claim 17
Dependent Claim
29 words
A high speed tool steel according to claim 7, wherein said steel has a deflective strength of at least 170 Kg/mm 2 and a hardness of at least 67HRC.
Claim 18
Dependent Claim
25 words
A high speed tool steel according to claim 1, wherein the molybdenum content ranges from 5- 10.4% and the tungsten content ranges from 8- 29.04%.
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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) | 1980-06-27 | 1980-12-27 | 1981-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-27 | 1984-12-27 | 1985-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-27 | 1988-12-27 | 1989-06-28 | $7700.00 | Window Closed / Lapsed |