US4599109A
Expired / Lapsed
US
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High hardness and high toughness nitriding powder metallurgical high-speed steel
Assignee: Kobe Steel Ltd
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Filing: 1985-06-18
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Granted: 1986-07-08
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Expires: 2005-06-18
Abstract
Abstract A high-speed steel obtained by powder metallurgy processing having a chemical composition which includes, in weight %, C: a quantity (%) which satisfies the formula Ceq+0.15≦C+12/14 N≦Ceq+0.35 where Ceq=0.19+0.017 (W+2Mo)+0.22V, and N, W, Mo and V are respectively the content (%) in steel ______________________________________ Cr: 3-5% V: 4.0-6.0% Mo: 8-12% Co: 5-15% W: 8-14% N: 0.2-1.2% ______________________________________ and the remainder is Fe, and (W+2Mo) is 27-32%, is disclosed.
Inventors
- 👤 Nobuyasu Kawai
- 👤 Minoru Hirano
- 👤 Hiromune Manto
- 👤 Hajime Esaka
- 👤 Hirofumi Fujimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:10
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0278; C22C33/0285
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
62 words
A high hardness and high toughness nitriding powder metallurgical high-speed steel comprising, in weight %, C: in a quantity (%) which satisfies formula Ceq+0.15≦C+12/14N≦Ceq+0.35 where Ceq=0.19+0.017(W+2Mo)+0.22V, and N, W, Mo and V are respectively the content (%) in steel: ______________________________________
Cr: 3-5% V: 4.0-6.0%
Mo: 8-12% Co: 5-15%
W: 8-14% N: 0.2-1.2%
______________________________________ and the remainder is Fe, and (W+2Mo) is 27-32%.
Claim 2
Dependent Claim
62 words
A high hardness and high toughness nitriding powder metallurgical high-speed steel comprising, in weight %, C: in a quantity (%) which satisfies formula Ceq+0.15≦C+12/14N≦Ceq+0.35 where Ceq=0.19+0.017(W+2Mo)+0.22V, and N, W, Mo and V are respectively the content (%) in steel: ______________________________________
Cr: 3-5% V: 4.0-6.0%
Mo: 8-12% Co: 5-15%
W: 8-14% N: 0.2-1.2%
______________________________________ and the remainder is Fe, and (W+2Mo) is 27-32%.
Claim 3
Dependent Claim
16 words
The high-speed steel of claim 1, wherein (W+2Mo), the W equivalent is from 28% to 30%.
Claim 4
Dependent Claim
15 words
The high-speed steel of claim 1, wherein the content of V is 4.5% to 5.5%.
Claim 5
Dependent Claim
15 words
The high-speed steel of claim 1, wherein the content of Co is 10% to 14%.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-07 | 1990-01-06 | 1990-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-07 | 1994-01-06 | 1994-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-07 | 1998-01-06 | 1998-07-08 | $7700.00 | Window Closed / Lapsed |