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Haynes 188 Alloy is a solid-solution-strengthened material that excels in high-temperature strength and fabricability at room temperature. It is particularly effective for long-term applications at temperatures of 1200°F (650°C) or higher. Haynes 188 is notably stronger than nickel-base solid-solution-strengthened alloys and significantly outperforms simple nickel-chromium or iron-nickel-chromium heat-resistant alloys. This superior strength can allow for a reduction in section thickness when Haynes 188 is used as a substitute for these materials.


Haynes 188 Alloy is covered by the following specifications:

  • UNS R30188
  • Rod, Bar, Wire, and Forging Stock: AMS 5772
  • Plate, Sheet, and Strip: AMS 5608
  • Welding Wire: AMS 5801

Chemical Composition

Element Min (wt%) Max (wt%)
Chromium (Cr) 20.0 24.0
Nickel (Ni) 20.0 24.0
Cobalt (Co) Balance
Tungsten (W) 13.0 16.0
Lanthanum (La) 0.02 0.12
Boron (B) 0.015
Carbon (C) 0.05 0.15
Iron (Fe) 3.0
Manganese (Mn) 1.25
Silicon (Si) 0.20 0.50
Phosphorus (P) 0.02
Sulfur (S) 0.015

Physical Properties

  • Density: 9.14 g/cm³
  • Melting Point: 1300℃ – 1330℃

Mechanical Properties at Room Temperature

Alloy Status: Solution Treatment

Property Value
Tensile Strength (Rm) 963 N/mm²
Yield Strength (Rp0.2) 446 N/mm²
Elongation (A5) 55%

Key Benefits

  1. High-Temperature Strength: Excellent performance in high-temperature environments, suitable for long-term applications at 1200°F (650°C) or more.
  2. Fabricability: Good formability and workability at room temperature.
  3. Superior Strength: Stronger than nickel-base solid-solution-strengthened alloys and simple nickel-chromium or iron-nickel-chromium heat-resistant alloys, allowing for reduced section thickness in applications.


Haynes 188 Alloy is commonly used in a variety of high-temperature applications, including:

  • Aerospace Components: Flame holders, transition ducts, afterburner liners, and combustion cans.
  • Gas Turbine Engines: Components that operate in the hot sections of engines.
  • Chemical Processing: Equipment that requires high strength and corrosion resistance at elevated temperatures.
  • Power Generation: High-temperature applications in power plants.

For more information:


Contact us: 9167347029

Email ID:  [email protected]

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