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

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.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation of U.S. patent application Ser. No. 14 / 744,515 filed Jun. 19, 2015, which claims priority to U.S. Provisional Patent Application No. 62 / 014,803 filed Jun. 20, 2014, the disclosures of which are hereby incorporated by reference for all purposes in their entireties.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The field of the present invention relates to solid solution strengthened nickel-chromium-iron-molybdenum corrosion resistant alloys suitable for use in sour gas and oil environments.[0004]2. Description of Related Art[0005]Nickel alloys generally have the ability to withstand a wide variety of severe operating conditions involving corrosive environments, high temperatures, and high stresses. From commercially pure nickel to complex alloys containing as many as twelve or more alloying elements, nickel alloys are used for a wide variety of applications, including, for example: chemic...

AI Technical Summary

Benefits of technology

The patent text aims to create an alloy that has more strength than existing solid solutions, specifically the INCONEL® alloy G-3, while maintaining ductility, toughness, fabricability, and corrosion resistance. The alloy should also have a clean microstructure.

Problems solved by technology

The corrosive conditions of sour wells are compounded by high temperatures and high pressures.

However, precipitation hardenable alloys have disadvantages compared to solid solution alloys.

Therefore, the use of precipitation hardenable alloys is generally limited to applications for which solid solution alloys are not desirable.

Deeper wells mean higher temperatures, higher pressures, and more corrosive environments, especially with regard to sour gas environments.

However, Kudo '210 does not provide an alloy having a high strength without loss of ductility, toughness, fabrication, and corrosion resistance while possessing a clean microstructure as required by the oil and gas industries.

However, Kudo '211 does not provide an alloy having a high strength without loss of ductility, toughness, fabrication, and corrosion resistance while possessing a clean microstructure as required by the oil and gas industries.

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