Patent US4121929A successfully refreshed from Google Patents.
US4121929A
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Nitrogen containing high speed steel obtained by powder metallurgical process
Assignee: Kobe Steel Ltd
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Filing: 1977-02-11
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Granted: 1978-10-24
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Expires: 1997-02-11
Abstract
Abstract A nitrogen containing high speed steel produced by powder metallurgical process, which comprises at least 0.40% N, 3.0-15% V, C in an amount satisfying the relationship of 1.0 + 0.2V (%) ≦ (C + N) ≦ 1.5 + 0.2V (%), at least one element selected from the group consisting of up to 15% Cr, up to 10% Mo, up to 20% W, and up to 15% Co, with balance iron.
Inventors
- 👤 Nobuyasu Kawai
- 👤 Katuhiko Honma
- 👤 Hirofumi Fujimoto
- 👤 Hiroshi Takigawa
- 👤 Minoru Hirano
- 👤 Masaru Ishii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:58
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0278; C22C33/0292; C22C38/00; C22C38/001
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
86 words
A nitrogen containing high speed steel produced by the powder metallurgical process from a prealloyed powder which is then nitrided and hot isostatically pressed, wherein said high speed steel comprises: at least 0.40% N, 3.0-15% V, C in an amount satisfying the relationship of 1.0 + 0.2V(%) < (C + N) < 1.5 + 0.2V(%), at least one element selected from the group consisting of up to 15% Cr, up to 10% Mo, up to 20% W and up to 15% Co and the balance iron.
Claim 2
Dependent Claim
86 words
A nitrogen containing high speed steel produced by the powder metallurgical process from a prealloyed powder which is then nitrided and hot isostatically pressed, wherein said high speed steel comprises: at least 0.40% N, 3.0-15% V, C in an amount satisfying the relationship of 1.0 + 0.2V(%) < (C + N) < 1.5 + 0.2V(%), at least one element selected from the group consisting of up to 15% Cr, up to 10% Mo, up to 20% W and up to 15% Co and the balance iron.
Claim 3
Dependent Claim
34 words
The nitrogen containing high speed steel as set forth in claim 1, wherein C content is in an amount satisfying the relationship of 1.1 + 0.2V(%) ≦ (C + N) ≦ 1.5 + 0.2V(%).
Claim 4
Dependent Claim
19 words
The nitrogen containing high speed steel as set forth in claim 1, wherein N content is at least 0.45%.
Claim 5
Dependent Claim
38 words
The nitrogen containing high speed steel as set forth in claim 1, which further comprises: at least one element selected from the group consisting of up to 2% Zr, up to 5% Nb and up to 1% B.
Claim 6
Dependent Claim
18 words
The nitrogen containing high speed steel as set forth in claim 1 wherein (C + N) is 1.7-2.2%.
Claim 7
Dependent Claim
18 words
The nitrogen containing high speed steel as set forth in claim 1 wherein (C + N) is 3.4-3.9%.
Claim 8
Dependent Claim
18 words
The nitrogen containing high speed steel as set forth in claim 1 wherein the nitrogen content is 0.40%-0.90%.
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) | 1981-10-23 | 1982-04-24 | 1982-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-23 | 1986-04-24 | 1986-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-23 | 1990-04-24 | 1990-10-24 | $7700.00 | Window Closed / Lapsed |