Product Sheet
Haynes 188
A cobalt-chrome-nickel superalloy engineered for extreme high-temperature performance
About Haynes® 188
Haynes® 188, also designated UNS R30188, is a cobalt-based superalloy developed for outstanding oxidation and high-temperature corrosion resistance in extreme environments—up to 1095 °C. Known for its exceptional thermal stability, good weldability, and thermal fatigue resistance, it is an alloy of choice for gas turbines, combustion chambers, aero engines, and other high-temperature systems.
Its balanced combination of chromium, nickel, tungsten, and lanthanum provides long-term structural stability and excellent cyclic oxidation resistance.
Technical Characteristics & Composition
Cobalt-Chrome-Nickel Base Alloy
Haynes® 188 is primarily composed of cobalt, with additions of chromium, nickel, and tungsten. This balanced composition delivers excellent mechanical strength, oxidation resistance, and structural integrity in severe thermal environments.
Sustained Oxidation Resistance
The alloy performs reliably at temperatures up to 1095 °C, providing long-lasting protection against high-temperature oxidation in demanding thermal systems such as combustion chambers and gas turbines.
Excellent Thermal Cycling Resistance
Thanks to its ability to withstand rapid temperature changes, Haynes® 188 limits material degradation under severe thermal cycling—reducing the risk of cracking or premature wear.
Ductility at Room and Elevated Temperatures
Even under elevated temperatures, the alloy remains ductile, allowing safe forming and processing without compromising structural integrity.
High Creep and Tensile Strength at Elevated Temperatures
Haynes® 188 retains its mechanical performance under prolonged stress and heat, making it ideal for critical components in high-temperature conditions.
Excellent TIG/MIG Weldability
It offers outstanding weldability, particularly using TIG and MIG processes, simplifying fabrication and integration into complex assemblies.
Resistance to Combustion Gases and Corrosive Atmospheres
Thanks to its unique chemical composition, Haynes® 188 resists degradation from fuel-rich and corrosive gases, ensuring long-lasting performance in thermal and engine systems.
Approximate Composition
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Cobalt (Co) : Balance
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Chromium (Cr): 20.0 – 24.0%
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Nickel (Ni) : 20.0 – 24.0 %
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Tungsten (W): 13.0 – 15.0%
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Iron (Fe): ≤ 3.0%
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Manganese (Mn): ≤ 1.25%
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Silicon (Si): ≤ 1.25%
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Carbon (C): 0.05 – 0.15%
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Lanthanum (La): 0.02 – 0.12%
Industries & Applications
Haynes® 188 is widely used in industries where materials must withstand extreme heat and aggressive atmospheres, including aerospace, power generation, and high-temperature processing.
Energy Sector
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Industrial burner components
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High-temperature piping
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Thermal insulation in oxidising environments
High-Temperature Industrial Processes
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Industrial furnaces
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Equipment exposed to hot gases and cyclic corrosion
Aerospace & Turbomachinery
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Combustion chambers
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Thermal shields
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Gas turbine nozzles and ducting
Why Choose Haynes® 188?
Haynes® 188 is ideal for applications exposed to extreme heat and repeated thermal cycles. Its exceptional properties ensure extended service life of components even under the most severe operating conditions.
High Thermal Stability
Maintains mechanical performance up to 1095 °C, making it perfectly suited for systems exposed to prolonged high heat.
Excellent Oxidation Cycle Resistance
Designed for harsh thermal cycling, this alloy offers outstanding resistance to repeated oxidation and minimises the risk of cracking or structural failure.
Durability in Harsh Environments
Whether exposed to hot gases, combustion atmospheres, or corrosive conditions, Haynes® 188 retains its structural integrity and reliability.
Controlled Weldability
Compatible with TIG and MIG processes, the alloy allows for precise fabrication and meets the strict requirements of aerospace and energy sectors.
Our Commitments
At MetalXplore, we are committed to delivering high-quality Haynes® 188 products, fully certified and traceable to international standards. We offer a wide range of formats, including round and square bars, sheets, plates, strips, tubes, fittings, flanges, and custom machined or forged parts. We also support the production of specialised components for the aerospace, energy, and high-temperature processing industries.
Superior Quality
Strictly tested, certified materials to ensure optimum durability and reliability.
Tailored Service
Custom alloys and solutions to meet the specific demands of your industry.
Responsiveness
Optimised delivery schedules to keep your projects on track.
Interested in this cobalt-based superalloy?
Contact our team for a quick quote, technical datasheet, or advice tailored to your high-temperature production challenges.
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