Patent US4194900A successfully refreshed from Google Patents.
US4194900A
Expired / Lapsed
US
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Hard alloyed powder and method of making the same
Assignee: Toyo Kohan Co Ltd
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Filing: 1978-10-05
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Granted: 1980-03-25
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Expires: 1998-10-05
Abstract
Abstract There is provided a hard alloyed powder comprising: B--from 3 to 20% by weight, Al--less than 3% by weight, Si--less than 5% by weight, O--less than 2.5% by weight, at least one metal selected from the group consisting of Cr, Mo, W, Ti, V, Nb, Ta, Hf, Zr, Co and Ni, in the following amounts: Cr from 5 to 35% by weight, Mo from 1 to 35% by weight, W from 0.5 to 30% by weight and each of Ti, V, Nb, Ta, Hf, Zr, Co and Ni--less than 15% by weight, and the balance being at least 10% by weight of Fe. A method for the production of said alloy powder is also provided and comprises atomizing molten alloy with water or inert gas in a specific manner.
Inventors
- 👤 Tsuneyuki Ide
- 👤 Ken-ichi Takagi
- 👤 Michio Watanabe
- 👤 Seiichi Ohhira
- 👤 Masahito Fukumori
- 👤 Yoshikazu Kondo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:03
CPC Classifications
B; B22; B22F; B22F9/00; B22F9/02; B22F9/06; B22F9/08; B22F9/082; C; C22; C22C; C22C29/00; C22C29/14; C22C33/00; C22C33/02; C22C33/0207; C22C33/0228
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
101 words
Hard alloy powder comprising: B--from 3 to 20% by weight, Al--less than 3% by weight, Si--from 0.3 to 5% by weight, O--less than 2.5% by weight, at least one metal selected from the group consisting of Cr, Mo, W, Ti, V, Nb, Ta, Hf, Zr, Co and Ni, in the following amounts: Cr from 5 to 35% by weight, Mo from 1 to 35% by weight, W from 0.5 to 30% by weight and each of Ti, V, Nb, Ta, Hf, Zr, Co and Ni less than 15% by weight, and the balance being at least 10% by weight of Fe.
Claim 2
Dependent Claim
101 words
Hard alloy powder comprising: B--from 3 to 20% by weight, Al--less than 3% by weight, Si--from 0.3 to 5% by weight, O--less than 2.5% by weight, at least one metal selected from the group consisting of Cr, Mo, W, Ti, V, Nb, Ta, Hf, Zr, Co and Ni, in the following amounts: Cr from 5 to 35% by weight, Mo from 1 to 35% by weight, W from 0.5 to 30% by weight and each of Ti, V, Nb, Ta, Hf, Zr, Co and Ni less than 15% by weight, and the balance being at least 10% by weight of Fe.
Claim 3
Dependent Claim
28 words
Hard alloyed powder as claimed in claim 1, comprising from 5 to 35% by weight of Cr to improve the corrosion resistance and oxidation resistance of the powder.
Claim 4
Independent Claim
178 words
A method of forming a hard alloyed powder by using a water atomizing or inert gas atomizing process, comprising the steps of: a. preparing as a raw material a mixture of: B--3 to 20% by weight, Si--up to 5% by weight, at least one metal selected from Cr, Mo, W, Ti, V, Nb, Ta, Hf, Zr, Co and Ni in the following amounts: Cr--5 to 35% by weight, Mo--1 to 35% by weight, W--0.5 to 30% by weight, and each of Ti, V, Nb, Ta, Hf, Zr, Co and Ni--up to 15% by weight, and the balance being at least 10% by weight of Fe, b. melting said raw material to form a molten alloy in an atmosphere comprising less than 30% by volume of oxygen, c. discharging a stream of said molten alloy in an atmosphere of an inert gas, d. impinging water or inert gas under pressure against said molten alloy stream at an angle from 10° to 20° with respect to the longitudinal axis of said stream to atomize the stream of said molten alloy.
Claim 5
Independent Claim
178 words
A method of forming a hard alloyed powder by using a water atomizing or inert gas atomizing process, comprising the steps of: a. preparing as a raw material a mixture of: B--3 to 20% by weight, Si--up to 5% by weight, at least one metal selected from Cr, Mo, W, Ti, V, Nb, Ta, Hf, Zr, Co and Ni in the following amounts: Cr--5 to 35% by weight, Mo--1 to 35% by weight, W--0.5 to 30% by weight, and each of Ti, V, Nb, Ta, Hf, Zr, Co and Ni--up to 15% by weight, and the balance being at least 10% by weight of Fe, b. melting said raw material to form a molten alloy in an atmosphere comprising less than 30% by volume of oxygen, c. discharging a stream of said molten alloy in an atmosphere of an inert gas, d. impinging water or inert gas under pressure against said molten alloy stream at an angle from 10° to 20° with respect to the longitudinal axis of said stream to atomize the stream of said molten alloy.
Claim 6
Dependent Claim
21 words
A process as claimed in claim 3, wherein the pressure range of the water jet is above 40 Kg/cm 2 .
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) | 1983-03-25 | 1983-09-24 | 1984-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-25 | 1987-09-24 | 1988-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-25 | 1991-09-24 | 1992-03-25 | $7700.00 | Window Closed / Lapsed |