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Alloy Portfolio

Nickel 925

Overview

Incoloy 925 is a precipitation-hardenable nickel-iron-chromium alloy with additions of molybdenum, copper, titanium, and aluminum. It offers excellent resistance to both reducing and oxidizing environments, making it suitable for various applications in harsh environments where corrosion and high temperatures are significant concerns.

Key Characteristics of Nickel 925:

  1. Corrosion Resistance: Incoloy 925 provides excellent resistance to both reducing and oxidizing acids, stress-corrosion cracking, pitting, and crevice corrosion in chloride-containing environments. This makes it suitable for use in harsh industrial environments, such as those found in oil and gas production.
  2. High Strength: Incoloy 925 exhibits high mechanical strength, making it suitable for use in applications requiring robust performance under high-pressure and high-temperature conditions.
  3. Age Hardenability: Incoloy 925 can be strengthened by a precipitation-hardening heat treatment process, resulting in improved mechanical properties, including tensile strength and hardness.
  4. High-Temperature Performance: This alloy maintains its mechanical properties at elevated temperatures, allowing it to be used in applications where exposure to high temperatures is a concern.
  5. Resistance to Sulfide Stress Cracking (SSC): Incoloy 925 is resistant to sulfide stress cracking, which makes it suitable for use in sour gas environments encountered in oil and gas production.
  6. Weldability: Incoloy 925 can be readily welded using conventional welding techniques, which adds to its versatility in various fabrication processes.

Applications of Nickel 925:

  1. Oil and Gas Industry: Incoloy 925 is widely used in the oil and gas industry for various components such as downhole equipment, wellhead components, tubing, casing, and valves. Its resistance to corrosion, including sulfide stress cracking, makes it suitable for use in sour gas environments.
  2. Chemical Processing: The corrosion resistance of Incoloy 925 makes it suitable for use in chemical processing applications, including reactors, vessels, heat exchangers, and piping systems where exposure to corrosive chemicals is a concern.
  3. Marine Applications: : Incoloy 925 is used in marine environments for components such as propeller shafts, pump shafts, and fasteners where resistance to corrosion from seawater and marine environments is required.
  4. Aerospace: Incoloy 925 is utilized in aerospace applications for components requiring high strength and corrosion resistance, such as aircraft engine parts, turbine blades, and exhaust systems.
  5. Power Generation: : Incoloy 925 is used in power generation applications, including steam turbines, boiler feedwater heaters, and heat exchangers, where corrosion resistance and high-temperature performance are critical.
  6. Petrochemical Industry: Incoloy 925 finds applications in the petrochemical industry for equipment such as pumps, valves, and piping systems used in processing and refining operations.
  7. Desalination Incoloy 925 can be used in desalination plants for components exposed to highly corrosive seawater environments, such as heat exchangers and piping systems.
  8. Industrial Equipment Incoloy 925 is utilized in various industrial equipment where corrosion resistance, high strength, and reliability are essential, including pumps, valves, fittings, and heat exchangers.
Here is the chemical composition of Incoloy 925, presented in a tabular format:
  • Nickel

    (Ni)

    42.0% - 46.0%

  • Chromium

    (Cr)

    19.5% - 22.5%

  • Iron

    (Fe)

    22.0% min

  • Molybdenum

    (Mo)

    2.5% - 3.5%

  • Copper

    (Cu)

    1.5% - 3.0%

  • Titanium

    (Ti)

    1.9% - 2.4%

  • Aluminum

    (Al)

    0.1% - 0.5%

  • Silicon

    (Si)

    0.5% max

  • Carbon

    (C)

    0.03% max

  • Manganese

    (Mn)

    0.01% - 0.5%

  • Sulfur

    (S)

    0.03% max

  • Phosphorus

    (S)

    0.02% max

Here are the typical mechanical properties of Incoloy 925, presented in a tabular format:
Property Value
Tensile Strength 755 MPa (110,000 psi) minimum
Yield Strength (0.2% offset) 515 MPa (75,000 psi) minimum
Elongation 25% minimum
Hardness (Brinell) Not typically specified
Modulus of Elasticity 207 GPa (30,000 ksi)