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US4437891A
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Oil-atomized low-alloy steel powder
Assignee: Nippon Steel Corp
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Filing: 1982-02-22
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Granted: 1984-03-20
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Expires: 2002-02-22
Abstract
Abstract An oil-atomized low-alloy steel powder having improved compressibility, compactibility and hardenability is disclosed. The steel powder has the chemical composition: C: no greater than 0.02%, Mn: 0.3-2.0%, oxygen: no greater than 0.10%, one or more of Cr: 0.1-2.0%, Mo: 0.05-1.0%, Ni: 0.1-2.0%, Cu: 0.2-2.0%, V: 0.03-0.5% and Nb: 0.05-0.5%, and the balance substantially iron.
Inventors
- 👤 Masahide Umino
- 👤 Eijiro Tamura
- 👤 Isamu Karasuno
- 👤 Minoru Ichidate
- 👤 Toshihiko Kubo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:49
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0264; B; B22; B22F; B22F1/00; B22F1/14; B22F1/145; B22F9/00; B22F9/02; B22F9/06; B22F9/08; B22F9/082; B22F2009/0824; B22F2999/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
97 words
An oil-atomized low-alloy steel powder having improved compressibility, compactibility and hardenability, the chemical composition of which after decarburization is: C: no greater than 0.02%, Mn: 0.3-2.0%, Oxygen: no greater than 0.10%, one or more of Cr: 0.1-2.0%, Mo: 0.05-1.0%, Ni: 0.1-2.0%, Cu: 0.2-2.0%, V: 0.03-0.5% and Nb: 0.05-0.5%, the balance substantially iron, the powder having a green density of 6.9 g/cm 3 or more and a Rattler value of 1.0% or less when the powder is mixed with 0.8% of zinc stearate as a lubricant and then is compacted at a pressure of 5 ton/cm 2 .
Claim 2
Dependent Claim
97 words
An oil-atomized low-alloy steel powder having improved compressibility, compactibility and hardenability, the chemical composition of which after decarburization is: C: no greater than 0.02%, Mn: 0.3-2.0%, Oxygen: no greater than 0.10%, one or more of Cr: 0.1-2.0%, Mo: 0.05-1.0%, Ni: 0.1-2.0%, Cu: 0.2-2.0%, V: 0.03-0.5% and Nb: 0.05-0.5%, the balance substantially iron, the powder having a green density of 6.9 g/cm 3 or more and a Rattler value of 1.0% or less when the powder is mixed with 0.8% of zinc stearate as a lubricant and then is compacted at a pressure of 5 ton/cm 2 .
Claim 3
Dependent Claim
45 words
An oil-atomized low-alloy steel powder as defined in claim 1, in which the steel composition is: C: no greater than 0.02%, Mn: 0.3-2.0%, Oxygen: no greater than 0.10%, one or more of Cr: 0.1-2.0%, Mo: 0.05-1.0%, Ni: 0.1-2.0% and Cu: 0.2-2.0%, the balance substantially iron.
Claim 4
Dependent Claim
41 words
An oil-atomized low-alloy steel powder as defined in claim 1, in which the steel composition is: C: no greater than 0.02%, Mn: 0.3-2.0%, Oxygen: no greater than 0.10%, one or more of V: 0.03-0.5% and Nb: 0.05-0.5%, the balance substantially iron.
Claim 5
Dependent Claim
54 words
An oil-atomized low-alloy steel powder as defined in claim 1, in which the steel composition is: C: no greater than 0.02%, Mn: 0.3-2.0%, Oxygen: no greater than 0.10%, one or more of Cr: 0.1-2.0%, Mo: 0.05-1.0%, Ni: 0.1-2.0% and Cu: 0.2-2.0%, one or more of V: 0.03-0.5% and Nb: 0.05-0.5%, the balance substantially iron.
Claim 6
Dependent Claim
39 words
An oil-atomized low-alloy steel powder as defined in any of claims 1, 2 or 4, in which the steel composition is: C: no greater than 0.02%, Mn: 0.5-1.8%, Oxygen: no greater than 0.10%, Cr: 0.5-1.5%, the balance substantially iron.
Claim 7
Dependent Claim
16 words
An oil-atomized low-alloy steel powder as defined in claim 5, which further comprises 0.1-0.5% of Mo.
Claim 8
Dependent Claim
35 words
An oil-atomized low-alloy steel powder as defined in any of claims 1 to 4, which has been subjected, after atomization, to decarburization at a temperature of 550° C. to 1250° C. in a hydrogen-containing atmosphere.
Claim 9
Dependent Claim
26 words
An oil-atomized low-alloy steel powder as defined in claim 7, in which the decarburization is carried out at a temperature of 750° C. to 1250° C.
Claim 10
Dependent Claim
40 words
An oil-atomized low-alloy steel powder as defined in claim 7, in which the decarburization is carried out in an atmosphere containing hydrogen and steam under such conditions that the ratio P H .sbsb.2 O/P H .sbsb.2 is 0.1 or less.
Claim 11
Dependent Claim
24 words
An oil-atomized low-alloy steel powder as defined in claim 9, in which the ratio P H .sbsb.2 O/P H .sbsb.2 is 0.04 or less.
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) | 1987-03-20 | 1987-09-19 | 1988-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-20 | 1991-09-19 | 1992-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-20 | 1995-09-19 | 1996-03-20 | $7700.00 | Window Closed / Lapsed |