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US4101347A
Expired / Lapsed
US
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Ferrite-austenite stainless steel castings having an improved erosion-corrosion resistance
Assignee: Daido Steel Co Ltd
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Filing: 1977-05-06
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Granted: 1978-07-18
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Expires: 1997-05-06
Abstract
Abstract Ferrite-austenite stainless steel castings having an improved erosion-corrosion resistance consist by weight percentage of not more than 0.1% of C, 0.2-3% of Si, not more than 2% of Mn, 2.2-4% of Cu, 3-9% of Ni, 20-30% of Cr, 2-6% of Mo, 0.08-0.25% of N, 0.12-0.3% of Sn, at least one of 0-2% of Nb, 0-1% of Ti, 0-2% of Ta, 0-1% of Zr and 0-1.5% of V and remainder of Fe, and are obtained by solution heat treatment at 1,000°-1,150° C in such a manner that Cr- and Ni-equivalents lie within an area represented by the area ABCD shown in FIG. 1 of the accompanying drawings.
Inventors
- 👤 Masakuni Fujikura
- 👤 Tomio Kono
- 👤 Kazuto Terai
- 👤 Naohiro Abe
- 👤 Kiyohito Ishida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:38
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/42; C22C38/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
A ferrite-austenite stainless steel casting having an improved erosion-corrosion resistance, consisting by weight percentage of not more than 0.1% of carbon, 0.2-3% of silicon, not more than 2% of manganese, 2.2-4% of copper, 3-9% of nickel, 20-30% of chromium, 2-6% of molybdenum, 0.08-0.25% of nitrogen, 0.12-0.3% of tin, 0-2% of niobium, 0-1% of titanium, 0-2% of tantalum, 0-1% of zirconium, 0-5% of vanadium and remainder of iron; said stainless steel casting being obtained by solution heat treatment at a temperature of 1,000-1,150° C in such a manner that chromium-and nickel-equivalents lie within an area represented by the area ABCD shown in FIG. 1 of the accompanying drawings.
Claim 2
Dependent Claim
107 words
A ferrite-austenite stainless steel casting having an improved erosion-corrosion resistance, consisting by weight percentage of not more than 0.1% of carbon, 0.2-3% of silicon, not more than 2% of manganese, 2.2-4% of copper, 3-9% of nickel, 20-30% of chromium, 2-6% of molybdenum, 0.08-0.25% of nitrogen, 0.12-0.3% of tin, 0-2% of niobium, 0-1% of titanium, 0-2% of tantalum, 0-1% of zirconium, 0-5% of vanadium and remainder of iron; said stainless steel casting being obtained by solution heat treatment at a temperature of 1,000-1,150° C in such a manner that chromium-and nickel-equivalents lie within an area represented by the area ABCD shown in FIG. 1 of the accompanying drawings.
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) | 1981-07-17 | 1982-01-16 | 1982-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-17 | 1986-01-16 | 1986-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-17 | 1990-01-16 | 1990-07-18 | $7700.00 | Window Closed / Lapsed |