US4035182A
Expired / Lapsed
US
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Ni-Cr-Fe alloy having an improved resistance to stress corrosion cracking
Assignee: Nippon Steel Corp
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Filing: 1974-10-07
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Granted: 1977-07-12
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Expires: 1994-10-07
Abstract
Abstract Herein disclosed is an Ni-Cr-Fe alloy being substantially in the single phase of austenite and improved in resistance to stress corrosion cracking. The alloy contains, by weight; 0.03 to 0.12% of carbon; 0.2 to 4% of silicon; 0.1 to 3% of manganese; 12 to 45% of nickel; 15 to 35% of chromium; vanadium and/or aluminum, the total amount of vanadium and aluminum being in the range of 0.2 to 4.0%, titanium in an amount of at least 5 times the carbon content and up to 1% of the total composition, and/or niobium in an amount of at least 7 times the carbon content and up to 1% of the total composition, and/or zirconium in an amount of at least 7 times the carbon content and up to 1% of the total composition, and/or tungusten in an amount of at least 5 times the carbon content and up to 2% of the total composition, the total amount of titanium and/or niobium and/or zirconium and/or tungusten being in the range of 0.3 to 2%; if desired, copper and/ or molybdenum in a total amount of 0.3 to 4%; and the balance of iron. This alloy has outstanding utility as structural material of heat exchanger, such as U-shaped tube of the nuclear reactor.
Inventors
- 👤 Masamichi Kowaka
- 👤 Hisao Fujikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:40
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/46
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
201 words
A Ni-Cr-Fe alloy being improved in resistance to stress corrosion cracking in water, water containing chlorine ion, at high temperatures and pressures, consisting essentially of, by weight; 0.03 to 0.12% of carbon; 1.5 to 4.0% of silicon; 0.1 to 3% of manganese; 25 to 45% of nickel; 24 to 35% of chromium; 0.9 to 4.0% of vanadium; at least one element selected from the group consisting of titanium in an amount of at least 5 times the carbon content and up to 1% of the total composition, niobium in an amount of at least 7 times the carbon content and up to 1% of the total composition, zirconium in an amount of at least 7 times the carbon content and up to 1% of the total composition, and tungsten in an amount of at least 5 times the carbon content and up to 2% of the total composition, the total amount of any combination of the group consisting titanium, niobium, zirconium and tungsten being in the range of 0.3 to 2%; at least one element selected from the group consisting of copper and molybdenum, the total amount of copper and molybdenum being up to 4%; and the balance essentially of iron.
Claim 2
Dependent Claim
201 words
A Ni-Cr-Fe alloy being improved in resistance to stress corrosion cracking in water, water containing chlorine ion, at high temperatures and pressures, consisting essentially of, by weight; 0.03 to 0.12% of carbon; 1.5 to 4.0% of silicon; 0.1 to 3% of manganese; 25 to 45% of nickel; 24 to 35% of chromium; 0.9 to 4.0% of vanadium; at least one element selected from the group consisting of titanium in an amount of at least 5 times the carbon content and up to 1% of the total composition, niobium in an amount of at least 7 times the carbon content and up to 1% of the total composition, zirconium in an amount of at least 7 times the carbon content and up to 1% of the total composition, and tungsten in an amount of at least 5 times the carbon content and up to 2% of the total composition, the total amount of any combination of the group consisting titanium, niobium, zirconium and tungsten being in the range of 0.3 to 2%; at least one element selected from the group consisting of copper and molybdenum, the total amount of copper and molybdenum being up to 4%; and the balance essentially of iron.
Claim 3
Dependent Claim
177 words
A Ni-Cr-Fe alloy being improved in resistance to stress corrosion cracking in water, water containing chlorine ion, at high temperatures and pressures, consisting essentially of, by weight; 0.03 to 0.12% of carbon; 1.5 to 4.0% of silicon; 0.1 to 3% of manganese; 25 to 45% of nickel; 24 to 35% of chromium; 0.9 to 4.0% of vanadium; at least one element selected from the group consisting of titanium in an amount of at least 5 times the carbon content and up to 1% of the total composition, niobium in an amount of at least 7 times the carbon content and up to 1% of the total composition, zirconium in an amount of at least 7 times the carbon content and up to 1% of the total composition, and tungsten in an amount of at least 5 times the carbon content and up to 2% of the total composition, the total amount of any combination of the group consisting titanium, niobium, zirconium and tungsten being in the range of 0.3 to 2%; and the balance essentially of iron.
Claim 4
Dependent Claim
177 words
A Ni-Cr-Fe alloy being improved in resistance to stress corrosion cracking in water, water containing chlorine ion, at high temperatures and pressures, consisting essentially of, by weight; 0.03 to 0.12% of carbon; 1.5 to 4.0% of silicon; 0.1 to 3% of manganese; 25 to 45% of nickel; 24 to 35% of chromium; 0.9 to 4.0% of vanadium; at least one element selected from the group consisting of titanium in an amount of at least 5 times the carbon content and up to 1% of the total composition, niobium in an amount of at least 7 times the carbon content and up to 1% of the total composition, zirconium in an amount of at least 7 times the carbon content and up to 1% of the total composition, and tungsten in an amount of at least 5 times the carbon content and up to 2% of the total composition, the total amount of any combination of the group consisting titanium, niobium, zirconium and tungsten being in the range of 0.3 to 2%; and the balance essentially of iron.
Claim 5
Dependent Claim
205 words
A Ni-Cr-Fe alloy being improved in resistance to stress corrosion cracking in water, water containing chlorine ion, at high temperatures and pressures, consisting essentially of, by weight; 0.03 to 0.12% of carbon; 1.5 to 4.0% of silicon; 0.1 to 3% of manganese; 25 to 45% to nickel; 24 to 35% of chromium; 0.9 to 4.0% of vanadium; at least one element selected from the group consisting of titanium in an amount of at least 5 times the carbon content and up to 1% of the total composition, niobium in an amount of at least 7 times the carbon content and up to 1% of the total composition, zirconium in an amount of at least 7 times the carbon content and up to 1% of the total composition, and tungsten in an amount of at least 5 times the carbon content and up to 2% of the total composition, the total amount of any combination of the group consisting titanium, niobium, zirconium and tungsten being in the range of 0.3 to 2%; at least one element selected from the group consisting of copper and molybdenum, the total amount of copper and molybdenum being in the range of 0.3 to 4%; and the balance essentially of iron.
Claim 6
Dependent Claim
205 words
A Ni-Cr-Fe alloy being improved in resistance to stress corrosion cracking in water, water containing chlorine ion, at high temperatures and pressures, consisting essentially of, by weight; 0.03 to 0.12% of carbon; 1.5 to 4.0% of silicon; 0.1 to 3% of manganese; 25 to 45% to nickel; 24 to 35% of chromium; 0.9 to 4.0% of vanadium; at least one element selected from the group consisting of titanium in an amount of at least 5 times the carbon content and up to 1% of the total composition, niobium in an amount of at least 7 times the carbon content and up to 1% of the total composition, zirconium in an amount of at least 7 times the carbon content and up to 1% of the total composition, and tungsten in an amount of at least 5 times the carbon content and up to 2% of the total composition, the total amount of any combination of the group consisting titanium, niobium, zirconium and tungsten being in the range of 0.3 to 2%; at least one element selected from the group consisting of copper and molybdenum, the total amount of copper and molybdenum being in the range of 0.3 to 4%; and the balance essentially of iron.
Claim 7
Dependent Claim
58 words
A Ni-Cr-Fe alloy being improved in resistance to stress corrosion cracking in water, water containing chlorine ion, at high temperatures and pressures, essentially consisting of by weight, 25.55% of nickel, 24.82% of chromium, 1.71% of silicon, 1.62% of manganese, 0.90% of copper, 2.06% of molybdenum, 1.96% of vanadium, 0.41% of titanium, 0.04% of carbon, and traces of phosphorus.
Claim 8
Dependent Claim
58 words
A Ni-Cr-Fe alloy being improved in resistance to stress corrosion cracking in water, water containing chlorine ion, at high temperatures and pressures, essentially consisting of by weight, 25.55% of nickel, 24.82% of chromium, 1.71% of silicon, 1.62% of manganese, 0.90% of copper, 2.06% of molybdenum, 1.96% of vanadium, 0.41% of titanium, 0.04% of carbon, and traces of phosphorus.
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) | 1980-07-11 | 1981-01-10 | 1981-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-11 | 1985-01-10 | 1985-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-11 | 1989-01-10 | 1989-07-12 | $7700.00 | Window Closed / Lapsed |