Gnee Steel is a professional manufacturer of Inconel 718. Gnee Steel's 718 product packaging includes: steel strapping: pipes with an outer diameter not exceeding 3 inches are typically bundled together with polypropylene film to prevent rusting during sea transport and then secured with steel straps; wooden crates/crates: pipes are usually packed in wooden crates or crates for protection during transport, especially for longer or larger diameter pipes; seaworthy export packaging: suppliers typically use standard seaworthy export packaging methods, which may include various materials and techniques to protect the pipes during transport; and tarpaulin packaging: to prevent rainwater, seawater, etc., from seeping into the export wooden crate packaging during transport. Gnee Steel also specializes in the production and sales of alloy materials. Gnee Steel's products are widely used in aerospace, chemical, power, automotive, and nuclear energy fields, and customized alloy material solutions can be provided according to customer needs. For alloy material price inquiries or to obtain customized alloy material solutions, please feel free to contact us at ss@gneesteel.com for a quote.
Inconel 718 alloy for the oil and gas industry
Inconel 718 alloy for the oil and gas industry
Inconel 718 is a high-strength, corrosion-resistant nickel-based superalloy widely used in the oil and gas industry for manufacturing critical downhole tools, wellhead components, valves, and fasteners. Due to its resistance to seawater corrosion, hydrogen embrittlement, and stress corrosion cracking (SCC), Inconel 718 is particularly suitable for acidic and high-pressure, high-temperature (HPHT) environments, and typically meets NACE MR0175 standards.
Is Inconel 718 alloy weldable?
Inconel 718 alloy exhibits excellent weldability in both age-hardened and annealed states. However, despite its high resistance to strain-induced aging cracking, some welding issues remain, such as microcracks and solidification cracks.
Alloy 718 is widely used in the oil and gas industry due to its high strength, corrosion resistance, and the ability to achieve different strength grades through heat treatment, making it an ideal corrosion-resistant alloy. Although initially developed for high-temperature applications, Alloy 718's properties have been optimized for the oil industry through machining and heat treatment. The properties most important to the oil and gas industry include corrosion resistance, strength, toughness, resistance to hydrogen embrittlement, and resistance to stress corrosion cracking.
Because Alloy 718 can be heat-treated to achieve the required strength grades, it is often used to manufacture thick-walled components and complex-shaped downhole and surface assemblies. This article will explore the applications of Alloy 718 in the oil industry, its corresponding mechanical properties and heat treatment processes, as well as its corrosion resistance in typical oilfield environments.
Heat Treatment of Inconel 718 Alloy
To improve the creep resistance and crack strength of In 718, and to give it excellent lateral ductility for aerospace applications, it is typically subjected to standard heat treatment. This heat treatment brings its minimum yield strength to 150 ksi. The annealing temperature of approximately 1850 to 1925°F was chosen because lower annealing temperatures (approximately 1700 to 1750°F) are insufficient to homogenize the microstructure produced by earlier processing. 1925°F was chosen as the maximum annealing temperature to prevent excessive grain growth. Due to specification requirements, the final temperature range of 1850 to 1900°F was determined.
inconel 718 Corrosion resistance
| Alloy | H2S pressure | Corrosion rate-300oF | Corrosion rate at 400of |
| 718 | 10 psi | 3 mpy or 0.076 mm/y | 0.3 mpy or 0.008 mm/y |
| 718 | 50 psi | 0.7 mpy or 0.018 mm/y | 2.3 mpy or 0.058 mm/y |
| 718 | 100 psi | 0.1 mpy or 0.003 mm/y | 1.2 mpy or 0.030 mm/y |
| 925 | 0 psi | 0.1 mpy or 0.003 mm/y | 0.1 mpy or 0.003 mm/y |
| 925 | 50 psi | 0.4 mpy or 0.010 mm/y | 0.5 mpy or 0.058 mm/y |
| 925 | 100 psi | 0.1 mpy or 0.003 mm/y | 0.4 mpy or 0.010 mm/y |
Applications of Inconel 718 in the Drilling Industry
The widespread use of directional drilling technology has spurred the extreme applications of Inconel 718 alloys. These applications require a non-magnetic material with excellent corrosion resistance, and titanium alloys and Inconel 718 alloys perfectly meet these requirements and are commercially available to meet strength standards. Inconel 718 alloys can even meet the hardenability requirements of large-sized workpieces.
In other modes, drilling media are highly corrosive. Drilling mud, due to its high concentration of chlorides, is highly corrosive under harsh drilling conditions; hydrochloric acid is pumped into the drilling rig. Standard nickel-based superalloys, stainless steels, and copper alloys can all be used under these conditions. Inconel 718 experiences less corrosion in these media and is not susceptible to stress corrosion cracking caused by sulfur. The advantages of using In 718 lie in its higher fatigue strength and excellent corrosion resistance.
Inconel 718 in the oil and gas industry
Key characteristics of Inconel 718 in the oil and gas industry:
Corrosion resistance: Excellent resistance to sulfide stress cracking, crevice corrosion, and pitting corrosion in acidic environments (H₂S, CO₂, and chlorides).
Mechanical strength: Maintains extremely high yield strength, tensile strength, and creep rupture strength, making it superior to many stainless steels and conventional nickel alloys in load-bearing applications.
Applications: Commonly used in downhole tools, wellhead equipment, gate valves, packers, tubing hangers, and fasteners.
Operating temperature: Suitable for high temperature and high pressure (HTHP) environments, maintaining strength up to approximately 650°C (1200°F).
Machinability: Good weldability, available in various forms including bars, billets, and plates.
Standards: Products typically supplied conform to NACE MR0175/ISO 15156, which specifies materials used in oil and gas production.
About Gnee Steel
Gnee Steel is a professional manufacturer of nickel-based alloys, including Nickel 201, Nickel 202, Hastelloy C-276, Hastelloy C-22, Hastelloy B, Hastelloy C-4, Inconel 600, Inconel 625, Inconel 718, Inconel X-750, Incoloy 800, Incoloy 800H/HT, Incoloy 825, Monel 400, Monel K500, and other high-temperature alloy materials. We specialize in the production and sales of alloy materials. Gnee Steel's products are widely used in aerospace, chemical, power generation, automotive, nuclear energy, and other fields, and we can provide customized alloy material solutions according to customer needs. For inquiries about alloy material prices or customized alloy material solutions, please feel free to contact us via email at ss@gneemetal.com for a quote.
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