US4302247A
Expired / Lapsed
US
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High strength austenitic stainless steel having good corrosion resistance
Assignee: Kobe Steel Ltd
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Filing: 1980-01-22
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Granted: 1981-11-24
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Expires: 2000-01-22
Abstract
Abstract The present invention discloses a high strength austenitic stainless steel having good corrosion resistance and, in particular, good hydrogen embrittlement resistance, which consists essentially of up to 0.02% by weight of C, up to 0.7% by weight of Si, 2.0 to 6.5% by weight of Mn, 17.5 to 30.0% by weight of Ni, 23.0 to 35.0% by weight of Cr, 1.5 to 5.5% by weight of Mo, 0.15 to 0.45% by weight of N, 0 to 0.6% by weight of V, the balance iron and inevitable impurities.
Inventors
- 👤 Ryouichi Abe
- 👤 Masao Sato
- 👤 Seiji Kikuma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:08
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/58
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
77 words
A high strength austenitic stainless steel having good corrosion resistance and, in particular, good hydrogen embrittlement resistance, consisting essentially of: ______________________________________
carbon up to 0.02% by weight
silicon up to 0.7% by weight
manganese about 2.4 to 6.5% by weight
nickel 17.5 to 30.0% by weight
chromium 23.0 to 35.0% by weight
molybdenum 1.5 to 5.5% by weight
nitrogen 0.15 to 0.45% by weight
vanadium 0 to 0.6% by weight
______________________________________ the balance iron and inevitable impurities.
Claim 2
Dependent Claim
77 words
A high strength austenitic stainless steel having good corrosion resistance and, in particular, good hydrogen embrittlement resistance, consisting essentially of: ______________________________________
carbon up to 0.02% by weight
silicon up to 0.7% by weight
manganese about 2.4 to 6.5% by weight
nickel 17.5 to 30.0% by weight
chromium 23.0 to 35.0% by weight
molybdenum 1.5 to 5.5% by weight
nitrogen 0.15 to 0.45% by weight
vanadium 0 to 0.6% by weight
______________________________________ the balance iron and inevitable impurities.
Claim 3
Dependent Claim
20 words
The austenitic stainless steel as set forth in claim 1, wherein the nickel content is 17.5 to 23.0% by weight.
Claim 4
Dependent Claim
20 words
The austenitic stainless steel as set forth in claim 1, wherein the chromium content is 24.0 to 27.0% by weight.
Claim 5
Dependent Claim
20 words
The austenitic stainless steel as set forth in claim 1, wherein the molybdenum content is 2.0 to 4.0% by weight.
Claim 6
Dependent Claim
20 words
The austenitic stainless steel as set forth in claim 1, wherein the nitrogen content is 0.2 to 0.4% by weight.
Claim 7
Dependent Claim
20 words
The austenitic stainless steel as set forth in claim 1, wherein the vanadium content is 0.1 to 0.6% by weight.
References Cited (Backward Citations)
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US3660080A
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US3726668A
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US4060389A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-23 | 1985-05-25 | 1985-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-23 | 1989-05-25 | 1989-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-23 | 1993-05-25 | 1993-11-24 | $7700.00 | Window Closed / Lapsed |