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US4116684A
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US
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High speed tool steel having high toughness
Assignee: Proterial Ltd
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Filing: 1977-03-11
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Granted: 1978-09-26
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Expires: 1997-03-11
Abstract
Abstract A high speed tool steel having high toughness as well as excellent wear resistance and heat resistance characteristics, this steel contains, by weight, C 0.7 - 1.4%, Si 0.5% max., Mn 0.5% max., Cr 3 - 6%, W 1 - 3.2%, Mo 5.5 - 7.5%, V 1 - 3.5%, Co 15% max., N 0.02 - 0.1%, one or more of Ti, Nb, and Zr 0.02 - 0.1% in total and the balance being Fe and incidental impurities. The relationship between tungsten and molybdenum contents of the steel is expressed in the formulated range 12% ≦ W + 2Mo ≦ 16%.
Inventors
- 👤 Norimasa Uchida
- 👤 Kingo Kiyonaga
- 👤 Hideki Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:32
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/26; C22C38/22; C22C38/24; C22C38/28
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
94 words
A high speed tool steel having high toughness, consisting essentially of by weight percentages, C 0.7 - 1.4%; Si 0.5% max.; Mn 0.5% max.; Cr 3 - 6%; W 1 - 3.2%, Mo 5.5 - 7.5%, and the relationship between the contents of W and Mo being 12% ≦ W + 2Mo ≦ 16%; V 1 - 3.5%; Co 15% max.; N 0.02 - 0.1%; one or more of the elements selected from the group of Ti, Nb and Zr and being 0.02 - 0.1% in total, the balance being Fe and incidental impurities.
Claim 2
Dependent Claim
94 words
A high speed tool steel having high toughness, consisting essentially of by weight percentages, C 0.7 - 1.4%; Si 0.5% max.; Mn 0.5% max.; Cr 3 - 6%; W 1 - 3.2%, Mo 5.5 - 7.5%, and the relationship between the contents of W and Mo being 12% ≦ W + 2Mo ≦ 16%; V 1 - 3.5%; Co 15% max.; N 0.02 - 0.1%; one or more of the elements selected from the group of Ti, Nb and Zr and being 0.02 - 0.1% in total, the balance being Fe and incidental impurities.
Claim 3
Dependent Claim
96 words
A high speed tool steel having high toughness, consisting essentially of by weight percentages, C 0.8 - 1.0%; Si 0.5% max.; Mn 0.5% max.; Cr 3.5 - 5%; W 1.2 - 2.5%, Mo 6.5 - 7.4%, and the relationship between the contents of W and Mo being 14.1% ≦ W + 2Mo ≦ 16%; V 1.1 - 2.0%; Co 9% max.; N 0.02 - 0.045%; either one or more of the elements selected from the group of Ti, Nb and Zr and being 0.02 - 0.045%; in total and the balance being Fe and incidental impurities.
Claim 4
Dependent Claim
96 words
A high speed tool steel having high toughness, consisting essentially of by weight percentages, C 0.8 - 1.0%; Si 0.5% max.; Mn 0.5% max.; Cr 3.5 - 5%; W 1.2 - 2.5%, Mo 6.5 - 7.4%, and the relationship between the contents of W and Mo being 14.1% ≦ W + 2Mo ≦ 16%; V 1.1 - 2.0%; Co 9% max.; N 0.02 - 0.045%; either one or more of the elements selected from the group of Ti, Nb and Zr and being 0.02 - 0.045%; in total and the balance being Fe and incidental impurities.
Claim 5
Dependent Claim
94 words
A high speed tool steel having high toughness, consisting essentially of by weight percentages, C 0.8 - 1.0%; Si 0.5% max.; Mn 0.5% max.; Cr 3.5 - 5%; W 1.2 - 2.5 %. Mo 6.5 - 7.4%, and the relationship between the contents of W and Mo being 14.1% ≦ W + 2Mo ≦ 16%; V 1.1 - 2.0%; Co 3% max.; N 0.02 - 0.045%; one or more of the elements selected from the group of Ti, Nb and Zr 0.02 - 0.045% in total; and the balance being Fe and incidental impurities.
Claim 6
Dependent Claim
94 words
A high speed tool steel having high toughness, consisting essentially of by weight percentages, C 0.8 - 1.0%; Si 0.5% max.; Mn 0.5% max.; Cr 3.5 - 5%; W 1.2 - 2.5 %. Mo 6.5 - 7.4%, and the relationship between the contents of W and Mo being 14.1% ≦ W + 2Mo ≦ 16%; V 1.1 - 2.0%; Co 3% max.; N 0.02 - 0.045%; one or more of the elements selected from the group of Ti, Nb and Zr 0.02 - 0.045% in total; and the balance being Fe and incidental impurities.
Claim 7
Dependent Claim
96 words
A high speed tool steel having high toughness, consisting essentially of by weight percentages, C 0.86 - 0.96%; Si 0.2 - 0.4%; Mn 0.2 - 0.4%; Cr 3.5 - 4.5%; W 1.5 - 2.3%, Mo 6.6 - 7.2%, and the relationship between the contents of W and Mo being 15% ≦ W + 2Mo ≦ 16%; V 1.3 - 1.9%; Co 3% max.; N 0.03 - 0.045%; one or more of the elements selected from the group of Ti, Nb and Zr and 0.02 - 0.045% in total; and the balance being Fe and incidental impurities.
Claim 8
Dependent Claim
96 words
A high speed tool steel having high toughness, consisting essentially of by weight percentages, C 0.86 - 0.96%; Si 0.2 - 0.4%; Mn 0.2 - 0.4%; Cr 3.5 - 4.5%; W 1.5 - 2.3%, Mo 6.6 - 7.2%, and the relationship between the contents of W and Mo being 15% ≦ W + 2Mo ≦ 16%; V 1.3 - 1.9%; Co 3% max.; N 0.03 - 0.045%; one or more of the elements selected from the group of Ti, Nb and Zr and 0.02 - 0.045% in total; and the balance being Fe and incidental impurities.
Claim 9
Dependent Claim
92 words
A high speed tool steel having high toughness, consisting essentially of by weight percentages, C 0.8 - 1.0%; Si 0.5% max.; Mn 0.5% max.; Cr 3.5 - 5%; W 1.2 - 2.5%, Mo 6.5 - 7.4%, and the relationship between the contents of W and Mo being 14.1% ≦ W + 2Mo ≦ 16%; V 1.1 - 2.0%; N 0.02 - 0.045%; one or more of the elements selected from the group of Ti, Nb and Zr, and being 0.02 - 0.045% in total; and the balance being Fe and incidental impurities.
Claim 10
Dependent Claim
92 words
A high speed tool steel having high toughness, consisting essentially of by weight percentages, C 0.8 - 1.0%; Si 0.5% max.; Mn 0.5% max.; Cr 3.5 - 5%; W 1.2 - 2.5%, Mo 6.5 - 7.4%, and the relationship between the contents of W and Mo being 14.1% ≦ W + 2Mo ≦ 16%; V 1.1 - 2.0%; N 0.02 - 0.045%; one or more of the elements selected from the group of Ti, Nb and Zr, and being 0.02 - 0.045% in total; and the balance being Fe and incidental impurities.
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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) | 1981-09-25 | 1982-03-27 | 1982-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-25 | 1986-03-27 | 1986-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-25 | 1990-03-27 | 1990-09-26 | $7700.00 | Window Closed / Lapsed |