Patent US4121930A successfully refreshed from Google Patents.
US4121930A
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Nitrogen containing high speed steel obtained by powder metallurgical process
Assignee: Kobe Steel Ltd
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Filing: 1976-12-29
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Granted: 1978-10-24
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Expires: 1996-12-29
Abstract
Abstract The present invention relates to a nitrogen containing high speed steel obtained by the powder metallurgical process, which comprises at least 0.40% N, 1.6 to 15% V, C in an amount satisfying the relationship of 0.5 + 0.2V (%) </= (C + N) </= 0.8 + 0.2V (%), at least one element selected from the group consisting of up to 15% of Cr, up to 10% of Mo, up to 20% of W and up to 15% of Co with the balance iron.
Inventors
- 👤 Toru Yukawa
- 👤 Nobuyasu Kawai
- 👤 Katuhiko Honma
- 👤 Hirofumi Fujimoto
- 👤 Hiroshi Takigawa
- 👤 Minoru Hirono
- 👤 Masaru Ishii
- 👤 Tsuneo Tatsuno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:54
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
79 words
A nitrogen containing high speed steel which comprises, after being formed by powder metallurgical processing, at least 0.40% of N, 1.6 to 15% of V, C in an amount satisfying the relation of 0.5 + 0.2 V (%) ≦ (C + N) ≦ 0.8 + 0.2V (%) and at least one member selected from the group consisting of up to 15% of Cr, up to 10% of Mo, up to 20% of W and up to 15% of Co.
Claim 2
Dependent Claim
79 words
A nitrogen containing high speed steel which comprises, after being formed by powder metallurgical processing, at least 0.40% of N, 1.6 to 15% of V, C in an amount satisfying the relation of 0.5 + 0.2 V (%) ≦ (C + N) ≦ 0.8 + 0.2V (%) and at least one member selected from the group consisting of up to 15% of Cr, up to 10% of Mo, up to 20% of W and up to 15% of Co.
Claim 3
Dependent Claim
22 words
The nitrogen containing high speed steel as set forth in claim 1, wherein the content of N is at least 0.45 %.
Claim 4
Dependent Claim
21 words
The nitrogen containing high speed steel as set forth in claim 1, wherein the content of V is 2.5 to 15%.
Claim 5
Dependent Claim
41 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% to Zr, up to 5% of Nb and up to 1% of B.
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 |