US2015368775A1PendingUtilityA1

Nickel-Chromium-Iron-Molybdenum Corrosion Resistant Alloy and Article of Manufacture and Method of Manufacturing Thereof

Assignee: HUNTINGTON ALLOYS CORPPriority: Jun 20, 2014Filed: Aug 11, 2015Published: Dec 24, 2015

Est. expiryJun 20, 2034(~7.9 yrs left)· nominal 20-yr term from priority

Inventors:Brian A. Baker Debajyoti Maitra

C22C 19/055C22C 30/02C22C 19/05C22F 1/10

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References

Claims

Abstract

A solid-solution nickel-based alloy for use in sour gas and oil environments, including, in percent by weight: chromium: min. of 21.0 and max. of 24.0%; iron: min. of 17.0 and max. of 21.0%; molybdenum: min. of 6.5 and max. of 8.0%; copper: min. of 1.0 and max. of 2.5%; tungsten: min. of 0.1 and max. of 1.5%; sol. nitrogen: min. of 0.08 and max. of 0.20%; manganese: max. of 4.0%; silicon: max. of 1.0%; carbon: max of. 0.015%; aluminum: max of 0.5%; and a total amount of niobium, titanium, vanadium, tantalum, and zirconium: max of 0.45%; the balance being nickel and incidental impurities, along with a method of manufacturing an article from the alloy, and an article of manufacture formed from the alloy.

Claims

exact text as granted — not AI-modified

The invention claimed is: 
     
         1 . A solid-solution nickel-based alloy for use in sour gas and oil environments, comprising, in percent by weight:
 chromium: min. of 21.0 and max. of 24.0%;   iron: min. of 17.0 and max. of 21.0%;   molybdenum: min. of 6.5 and max. of 8.0%;   copper: min. of 1.0 and max. of 2.5%;   tungsten: min. of 0.1 and max. of 1.5%;   sol. nitrogen: min. of 0.08 and max. of 0.20%;   manganese: max. of 4.0%;   silicon: max. of 1.0%;   carbon: max of. 0.015%;   aluminum max of. 0.5%; and   a total amount of niobium, titanium, vanadium, tantalum and zirconium: max of 0.45%;   the balance being nickel and incidental impurities.   
     
     
         2 . The alloy of  claim 1 , wherein the maximum chromium content is 23.5%. 
     
     
         3 . The alloy of  claim 1 , wherein the minimum molybdenum content is 6.8%. 
     
     
         4 . The alloy of  claim 1 , wherein the maximum molybdenum content is 7.8%. 
     
     
         5 . The alloy of  claim 1 , wherein the minimum copper content is 1.5%. 
     
     
         6 . The alloy of  claim 1 , wherein the minimum tungsten content is 0.50%. 
     
     
         7 . The alloy of  claim 1 , wherein the minimum sol. nitrogen content is 0.10%. 
     
     
         8 . The alloy of  claim 1 , wherein the maximum sol. nitrogen content is 0.19%. 
     
     
         9 . The alloy of  claim 1 , wherein a content of Mo+½ W is controlled to be a minimum of 7.6%. 
     
     
         10 . The alloy of  claim 1 , wherein a content of Mo+½ W is controlled to be a maximum of 8.5%. 
     
     
         11 . The alloy of  claim 1 , wherein an overall nitrogen content is a maximum of 0.20%. 
     
     
         12 . The alloy of  claim 1 , wherein the alloy has a low temperature ageability property, Δ(YS×El), of greater than 0 when a yield strength after aging (YS aa ) is at least 145 ksi, wherein Δ(YS×El) is the 0.2% Offset Yield Strength (ksi) times Percent Elongation after aging (YS aa ×El aa ) minus the 0.2% Offset Yield Strength (ksi) times Percent Elongation before aging (YS ba ×El ba ). 
     
     
         13 . The alloy of  claim 1 , wherein a low temperature ageability property satisfies the condition, Δ(YS×El)≧&gt;600−(YS aa −145)×20, wherein Δ(YS×El) is the 0.2% Offset Yield Strength (ksi) times Percent Elongation after aging (YS aa ×El aa ) minus the 0.2% Offset Yield Strength (ksi) times Percent Elongation before aging (YS ba ×El ba ). 
     
     
         14 . A method of manufacturing an article, comprising:
 providing a billet formed from the alloy of  claim 1  that is solution annealed and then cold worked a minimum of 20% to an article of predetermined dimensions; and   heat treating the cold worked article at 468°-537° C. (875°-999° F.) for five minutes to eight hours.   
     
     
         15 . An article of manufacture formed from an alloy of  claim 1 , wherein the article has a cold-worked and aged microstructure, having grain boundaries with no continuous precipitates, wherein upon microstructural examination on a section taken in the longitudinal direction with respect to the direction of cold work, a total area fraction of intermetallic phases, nitrides, and carbides does not exceed 1.0%, and wherein an area fraction of sigma phase does not exceed 0.5%. 
     
     
         16 . The article of  claim 15 , wherein the article has a 0.2% offset yield strength of at least 1000 MPa (145 ksi) and at least 12% elongation. 
     
     
         17 . The article of  claim 15 , wherein the article has a 0.2% offset yield strength of at least 1069 MPa (155 ksi) and at least 10% elongation. 
     
     
         18 . The article of  claim 15 , wherein the article has a 0.2% offset yield strength of at least 1138 MPa (165 ksi) and at least 8% elongation. 
     
     
         19 . A solid-solution nickel-based alloy for use in sour gas and oil environments, comprising, in percent by weight:
 chromium: min. of 21.0 and max. of 23.5%;   iron: min. of 17.0 and max. of 21.0%;   molybdenum: min. of 6.5 and max. of 8.0%;   copper: min. of 1.5 and max. of 2.5%;   tungsten: min. of 0.1 and max. of 1.5%;   sol. nitrogen: min. of 0.08 and max. of 0.20%;   manganese: max. of 4.0%;   silicon: max. of 1.0%;   carbon: max of. 0.015%;   aluminum max of. 0.5%; and   a total amount of niobium, titanium, vanadium, tantalum and zirconium: max of 0.45%;   the balance being nickel and incidental impurities.

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