Patent US2476280A successfully refreshed from Google Patents.
US4099992A
Expired / Lapsed
US
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Tubular products and methods of making the same
Assignee: Latrobe Steel Co
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Filing: 1977-04-11
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Granted: 1978-07-11
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Expires: 1997-04-11
Abstract
Abstract Tubular metal products and methods of making tubular metal products for use in sour gas wells, which are characterized by resistance to hydrogen sulfide embrittlement at temperatures up to about 600° F., are provided based upon an alloy having the composition up to about 0.035% maximum carbon, up to about 0.15% maximum silicon, up to about 0.15% maximum manganese, up to about 0.010% maximum sulfur, up to about 0.015% maximum phosphorus, about 19.0% to about 21.0% chromium, about 33.0% up to about 37.0% nickel, about 9.0% to about 10.5% molybdenum, up to about 1.0% titanium, up to about 0.015% boron, up to about 2% iron and the balance cobalt, said tubular product having been heat treated in the range 1350° F. to 1500° F. after cold working up to about 75%.
Inventors
- 👤 Leonard A. Pugliese
- 👤 James P. Stroup
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:41
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/03; C22C19/05; C22C19/051; C22C19/055; C22C19/07; C22F; C22F1/00; C22F1/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
130 words
A tubular metal product for use in sour gas wells characterized by resistance to hydrogen sulfide embrittlement at temperatures up to about 600° F. consisting essentially of an alloy having the composition up to about 0.035% maximum carbon, up to about 0.15% maximum silicon, up to about 0.15% maximum manganese, up to about 0.010% maximum sulfur, up to about 0.015% maximum phosphorus, about 19.0 to about 21.0% chromium, about 33.0% up to 37.0% nickel, about 9.0% to about 10.5% molybdenum, up to about 1.0% titanium, up to about 0.015% boron, up to about 2% iron and the balance cobalt, said tubular product having been cold worked at least sufficiently to impart increased strength and up to about 75% and thereafter heat treated in the range 1350° F. to 1500° F.
Claim 2
Dependent Claim
130 words
A tubular metal product for use in sour gas wells characterized by resistance to hydrogen sulfide embrittlement at temperatures up to about 600° F. consisting essentially of an alloy having the composition up to about 0.035% maximum carbon, up to about 0.15% maximum silicon, up to about 0.15% maximum manganese, up to about 0.010% maximum sulfur, up to about 0.015% maximum phosphorus, about 19.0 to about 21.0% chromium, about 33.0% up to 37.0% nickel, about 9.0% to about 10.5% molybdenum, up to about 1.0% titanium, up to about 0.015% boron, up to about 2% iron and the balance cobalt, said tubular product having been cold worked at least sufficiently to impart increased strength and up to about 75% and thereafter heat treated in the range 1350° F. to 1500° F.
Claim 3
Dependent Claim
89 words
A tubular metal product as claimed in claim 1 wherein the alloy composition is up to about 0.020% maximum carbon, lowest possible amount of silicon but not more than 0.15%, lowest possible amount of manganese but not more than 0.15%, lowest possible amount of sulfur but not more than 0.005%, lowest possible amount of phosphorus but not more than 0.010%, about 20.50% chromium, about 35.25% nickel, about 9.80% molybdenum, about 0.75% titanium, about 0.010% boron, lowest possible amount of iron but not more than 1% and the balance cobalt.
Claim 4
Dependent Claim
31 words
A tubular metal product as claimed in claim 1 wherein said product has been heat treated in the range 1400° F. to 1450° F. after cold working from 40% to 75%.
Claim 5
Independent Claim
153 words
A method for producing a tubular metal product suitable for use in sour gas wells and characterized by resistance to hydrogen sulfide embrittlement at temperatures up to about 600° F. comprising the steps of (a) forming a tubular metal member from an alloy consisting essentially of up to about 0.035% maximum carbon, up to about 0.15% maximum silicon, up to about 0.15% maximum manganese, up to about 0.010% maximum sulfur, up to about 0.015% maximum phosphorus, about 19.0% to about 21.0% chromium, about 33.0% to 37.0% nickel, about 9.0% to about 10.5% molybdenum, up to about 1.0% titanium, up to about 0.015% boron, up to about 2% iron and the balance cobalt, (b) cold working said tubular metal member in the range about 40% to 75%, (c) heat treating said cold worked tubular member in the range 1350° F. to 1500° F. when the cold working is in the range 40% to 75%.
Claim 6
Independent Claim
153 words
A method for producing a tubular metal product suitable for use in sour gas wells and characterized by resistance to hydrogen sulfide embrittlement at temperatures up to about 600° F. comprising the steps of (a) forming a tubular metal member from an alloy consisting essentially of up to about 0.035% maximum carbon, up to about 0.15% maximum silicon, up to about 0.15% maximum manganese, up to about 0.010% maximum sulfur, up to about 0.015% maximum phosphorus, about 19.0% to about 21.0% chromium, about 33.0% to 37.0% nickel, about 9.0% to about 10.5% molybdenum, up to about 1.0% titanium, up to about 0.015% boron, up to about 2% iron and the balance cobalt, (b) cold working said tubular metal member in the range about 40% to 75%, (c) heat treating said cold worked tubular member in the range 1350° F. to 1500° F. when the cold working is in the range 40% to 75%.
Claim 7
Dependent Claim
88 words
A method as claimed in claim 4 wherein the alloy consists essentially of up to about 0.020% maximum carbon, lowest possible amount of silicon but not more than 0.15%, lowest possible amount of manganese but not more than 0.15%, lowest possible amount of sulfur but not more than 0.005%, lowest possible amount of phosphorus but not more than 0.010%, about 20.50% chromium, about 35.25% nickel, about 9.80% molybdenum, about 0.75% titanium, about 0.010% boron, lowest possible amount of iron but not more than 1% and the balance cobalt.
Claim 8
Dependent Claim
31 words
A method as claimed in claim 4 wherein the cold working is in the range up to about 75% and the heat treating temperature is about 1400° F. to 1450° F.
References Cited (Backward Citations)
US4026583A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-07-10 | 1982-01-09 | 1982-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-10 | 1986-01-09 | 1986-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-10 | 1990-01-09 | 1990-07-11 | $7700.00 | Window Closed / Lapsed |