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US4804409A
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Alloy steel powder for powder metallurgy
Assignee: JFE Steel Corp
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Filing: 1987-07-11
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Granted: 1989-02-14
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Expires: 2007-07-11
Abstract
Abstract The improvement of strength and hardness of steel powders can be realized under good compressibility by alloying 0.2˜2.0 wt. % of W and 0.8˜3.0 wt. % of Ni, and further 0.1˜1.0 wt. % of Mo or 0.2˜2.0 wt. % of Cu in steel powder, and further the reduction of dimensional deviation introduced by heat treatment after sintering can also be achieved. This substantially eliminates damaging the shape and size of the sintered body after heat treatment.
Inventors
- 👤 Masaki Kawano
- 👤 Kuniaki Ogura
- 👤 Teruyoshi Abe
- 👤 Shigeaki Takajo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:34
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0264
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
27 words
An alloy steel powder for powder metallurgy, consisting of W: 0.2˜2.0 wt % and Ni: 0.8˜3.0 wt % and the balance being substantially Fe except for impurities.
Claim 2
Dependent Claim
27 words
An alloy steel powder for powder metallurgy, consisting of W: 0.2˜2.0 wt % and Ni: 0.8˜3.0 wt % and the balance being substantially Fe except for impurities.
Claim 3
Dependent Claim
28 words
The alloy steel powder according to claim 1, wherein each amount of W and Ni as an alloying ingredient is W: 0.2˜1.6 wt %, Ni: 1.0˜2.5 wt %.
Claim 4
Dependent Claim
31 words
An alloy steel powder for powder metallurgy, consisting of W: 0.2˜2.0 wt %, Ni: 0.8˜3.0 wt % and Mo: 0.1˜1.0 wt % and the balance being substantially Fe except for impurities.
Claim 5
Dependent Claim
31 words
An alloy steel powder for powder metallurgy, consisting of W: 0.2˜2.0 wt %, Ni: 0.8˜3.0 wt % and Mo: 0.1˜1.0 wt % and the balance being substantially Fe except for impurities.
Claim 6
Dependent Claim
33 words
The alloy steel powder according to claim 3, wherein each amount of W, Ni and Mo as an alloying ingredient is W: 0.2˜1.6 wt %, Ni: 1.0˜2.5 wt %, Mo: 0.2˜0.8 wt %.
Claim 7
Dependent Claim
31 words
An alloy steel powder for powder metallurgy, consisting of W: 0.2˜2.0 wt %, Ni: 0.8˜3.0 wt % and Cu: 0.2˜2.0 wt % and the balance being substantially Fe except for impurities.
Claim 8
Dependent Claim
31 words
An alloy steel powder for powder metallurgy, consisting of W: 0.2˜2.0 wt %, Ni: 0.8˜3.0 wt % and Cu: 0.2˜2.0 wt % and the balance being substantially Fe except for impurities.
Claim 9
Dependent Claim
43 words
The alloy steel powder according to claim 5, wherein each amount of W, Ni and Cu as an alloying ingredient is W: 0.2˜1.6 wt %, Ni: 1.0˜2.5 wt % Cu: 0.2˜1.0 wt %, and wherein the amount of Ni+Cu is 1.0˜2.5 wt %.
Claim 10
Dependent Claim
35 words
An alloy steel powder for powder metallurgy, consisting of W: 0.2˜2.0 wt %, Ni: 0.8˜3.0 wt %, Mo: 0.1˜1.0 wt % and Cu: 0.2˜2.0 wt % and the balance being substantially Fe except for impurities.
Claim 11
Dependent Claim
35 words
An alloy steel powder for powder metallurgy, consisting of W: 0.2˜2.0 wt %, Ni: 0.8˜3.0 wt %, Mo: 0.1˜1.0 wt % and Cu: 0.2˜2.0 wt % and the balance being substantially Fe except for impurities.
Claim 12
Dependent Claim
48 words
The alloy steel powder according to claim 7, wherein each amount of W, Ni, Mo and Cu as an alloying ingredient is W: 0.2˜1.6 wt % Ni: 1.0˜2.5 wt %, Mo: 0.2˜0.8 wt %, Cu: 0.2˜1.0 wt %, and wherein the amount of Ni+Cu is 1.0˜2.5 wt %.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1992-02-14 | 1992-08-15 | 1993-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-14 | 1996-08-15 | 1997-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-14 | 2000-08-15 | 2001-02-14 | $7700.00 | Window Closed / Lapsed |