US3940267A
Expired / Lapsed
US
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Austenitic heat resisting steel
Assignee: JFE Engineering Corp
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Filing: 1975-02-28
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Granted: 1976-02-24
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Expires: 1995-02-28
Abstract
Abstract An austenitic heat resisting steel exhibiting excellent strength for a long period of time services at an elevated temperature, coexistant-adding 0.02 to 1.0% Nb and 0.02 to 1.9% Zr or 0.02 to 1.0% Nb, 0.02 to 1.0% Zr and 0.02 to 1.0% Ti in addition to usual composition of a stainless steel, simultaneously adjusting the atomic ratio of said(Nb+Zr) or (Nb+Zr+Ti) to C within the range of 0.05 to 1.0, preferably 0.2 to 0.5.
Inventors
- 👤 Tohru Mimino
- 👤 Kazuhisa Kinoshita
- 👤 Takayuki Shinoda
- 👤 Isao Minegishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:44
CPC Classifications
C; C21; C21D; C21D6/00; C21D6/004; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/48; C22C38/50
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
81 words
An austenitic heat resisting steel exhibiting excellent strength for a long period of time services at an elevated temperature consisting of the following composition; C: 0.03 to 0.30%,
Si: up to 1.00%,
Mn: up to 2.00%, Cr: 15.0 to 26.0%,
Ni: 7.0 to 22.0%.
0.02 to 1% of each of Nb(containing Ta) and Zr wherein the atomic ratio of (Nb+Zr) to C is within the range of 0.05 to 1.0, preferably 0.2 to 0.5 unavoidable impurities and the balance being Fe.
Claim 2
Dependent Claim
81 words
An austenitic heat resisting steel exhibiting excellent strength for a long period of time services at an elevated temperature consisting of the following composition; C: 0.03 to 0.30%,
Si: up to 1.00%,
Mn: up to 2.00%, Cr: 15.0 to 26.0%,
Ni: 7.0 to 22.0%.
0.02 to 1% of each of Nb(containing Ta) and Zr wherein the atomic ratio of (Nb+Zr) to C is within the range of 0.05 to 1.0, preferably 0.2 to 0.5 unavoidable impurities and the balance being Fe.
Claim 3
Dependent Claim
84 words
An austenitic heat resisting steel exhibiting excellent strength for a long period of time services at an elevated temperature consisting of the following composition: C: 0.03 to 0.30%,
Si: up to 1.00%,
Mn: up to 2.00%, Cr: 15.0 to 26.0%.
Ni: 7.0 to 22.0%
0.02 to 1 % of each of Nb (containing Ta), Zr and Ti wherein the atomic ratio of (Nb+Zr+Ti) to C is within the range of 0.05 to 1.0, preferably, 0.2 to 0.5 unavoidable impurities and the balance being Fe.
Claim 4
Dependent Claim
84 words
An austenitic heat resisting steel exhibiting excellent strength for a long period of time services at an elevated temperature consisting of the following composition: C: 0.03 to 0.30%,
Si: up to 1.00%,
Mn: up to 2.00%, Cr: 15.0 to 26.0%.
Ni: 7.0 to 22.0%
0.02 to 1 % of each of Nb (containing Ta), Zr and Ti wherein the atomic ratio of (Nb+Zr+Ti) to C is within the range of 0.05 to 1.0, preferably, 0.2 to 0.5 unavoidable impurities and the balance being Fe.
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) | 1979-02-23 | 1979-08-25 | 1980-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-23 | 1983-08-25 | 1984-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-23 | 1987-08-25 | 1988-02-24 | $7700.00 | Window Closed / Lapsed |