US4168188A
Expired / Lapsed
US
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Alloys resistant to localized corrosion, hydrogen sulfide stress cracking and stress corrosion cracking
Assignee: Haynes International Inc
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Filing: 1978-02-09
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Granted: 1979-09-18
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Expires: 1998-02-09
Abstract
Abstract An alloy and a metal product characterized by resistance to localized corrosion, hydrogen sulfide stress cracking (hydrogen embrittlement) and stress corrosion cracking at temperatures up to about 200 DEG C. consisting essentially of nickel 40-65%, cobalt 0-5%, chromium 10-20%, molybdenum 12-18%, iron 10-20%, tungsten up to 5%, carbon 0-0.1% manganese up to 3%, vanadium up to 1% and silicon up to 0.2%. The alloy resistance is maintained when it is cold worked over 20%.
Inventors
- 👤 Aziz I. Asphahani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:48
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/03; C22C19/05; C22C19/051; C22C19/055
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
65 words
An alloy resistant to localized corrosion, to hydrogen sulfide stress cracking and to stress corrosion cracking at temperatures up to 200° C. consisting essentially of nickel 40-65%, cobalt 0-5%, chromium 10-20%, molybdenum 12-18%, iron 10-20%, tungsten up to 5%, carbon 0-0.1%, manganese up to 3%, vanadium up to 1% and silicon up to 0.2%, said alloy having been subject to at least 20% cold working.
Claim 2
Dependent Claim
65 words
An alloy resistant to localized corrosion, to hydrogen sulfide stress cracking and to stress corrosion cracking at temperatures up to 200° C. consisting essentially of nickel 40-65%, cobalt 0-5%, chromium 10-20%, molybdenum 12-18%, iron 10-20%, tungsten up to 5%, carbon 0-0.1%, manganese up to 3%, vanadium up to 1% and silicon up to 0.2%, said alloy having been subject to at least 20% cold working.
Claim 3
Dependent Claim
13 words
An alloy as claimed in claim 1 wherein the carbon content is 0-0.02%.
Claim 4
Dependent Claim
17 words
An alloy product as claimed in claim 1 which has been subjected to about 50% cold working.
Claim 5
Dependent Claim
32 words
An alloy as claimed in claim 1 having the composition cobalt 1%, chromium 15%, molybdenum 15%, iron 15%, tungsten 4%, carbon 0.006%, silicon 0.03%, manganese 1%, vanadium 0.2% and the balance nickel.
Claim 6
Dependent Claim
79 words
A tubular metal product for use in sour gas wells and characterized by resistance to localized corrosion, hydrogen sulfide stress cracking and stress corrosion cracking at temperatures up to about 200° C. consisting essentially of an alloy having the composition nickel 40-65%, cobalt 0-5%, chromium 10-20%, molybdenum 12-18%, iron 10-20%, tungsten up to 5%, carbon 0-0.1%, manganese up to 3%, vanadium up to 1% and silicon up to 0.2%, said product having been cold worked in excess of 20%.
Claim 7
Dependent Claim
79 words
A tubular metal product for use in sour gas wells and characterized by resistance to localized corrosion, hydrogen sulfide stress cracking and stress corrosion cracking at temperatures up to about 200° C. consisting essentially of an alloy having the composition nickel 40-65%, cobalt 0-5%, chromium 10-20%, molybdenum 12-18%, iron 10-20%, tungsten up to 5%, carbon 0-0.1%, manganese up to 3%, vanadium up to 1% and silicon up to 0.2%, said product having been cold worked in excess of 20%.
Claim 8
Dependent Claim
17 words
A tubular metal product as claimed in claim 5 wherein the carbon content is 0 to 0.02%.
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) | 1982-09-17 | 1983-03-19 | 1983-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-09-17 | 1987-03-19 | 1987-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-09-17 | 1991-03-19 | 1991-09-18 | $7700.00 | Window Closed / Lapsed |