Alloy 188 (UNS R30188) AMS 5608 – High-Temperature Cobalt-Based Superalloy for Gas Turbine & Aerospace Applications
Alloy 188 (UNS R30188), also known as Haynes® 188, is a cobalt-nickel-chromium-tungsten alloy that delivers exceptional performance in the most demanding high-temperature environments. As a cobalt-based superalloy, Alloy 188 combines outstanding high-temperature strength with excellent oxidation resistance up to 1095°C (2000°F) for prolonged exposures. This AMS 5608-compliant material has become the material of choice for gas turbine engines, aerospace components, and industrial high-temperature applications.
At ZYTC Alloy, we specialize in the production and supply of Alloy 188 in multiple forms including Plate, sheet, strip, wire, bar, tube, and forgings. We also offer custom machining and fabrication services to customer drawings, strictly adhering to Alloy 188 specifications.
Chemical Composition of Alloy 188 (AMS 5608)
The superior properties of Alloy 188 are derived from its carefully balanced chemical composition. Per AMS 5608 specifications, the nominal composition of Alloy 188 is as follows:
| Element | Weight % |
|---|---|
| Cobalt (Co) | Balance (approximately 39%) |
| Chromium (Cr) | 20.0 – 24.0% |
| Nickel (Ni) | 20.0 – 24.0% |
| Tungsten (W) | 13.0 – 16.0% |
| Iron (Fe) | 3.0% max |
| Manganese (Mn) | 1.25% max |
| Silicon (Si) | 0.20 – 0.50% |
| Carbon (C) | 0.05 – 0.15% |
| Lanthanum (La) | 0.03 – 0.15% |
| Boron (B) | 0.015% max |
| Phosphorus (P) | 0.02% max |
| Sulfur (S) | 0.015% max |
Alloy 188 is a solid solution-strengthened cobalt-based alloy. The high chromium content, combined with small lanthanum additions, produces an extremely tenacious and protective oxide scale that shields the material from high-temperature degradation. Tungsten provides solid-solution strengthening, while nickel enhances the alloy's overall stability and fabricability.
Mechanical Properties of Alloy 188
Alloy 188 exhibits remarkable mechanical properties that make it indispensable for critical high-temperature applications. The typical mechanical properties of annealed Alloy 188 per AMS 5608 include:
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Tensile Strength: 130 – 160 ksi (900 – 1100 MPa)
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Melting Range: 1300°C – 1360°C
Alloy 188 is not age hardenable but can be cold worked to achieve higher tensile and yield strength – up to 250 ksi (1725 MPa) in spring temper. The suggested operating temperature range for Alloy 188 extends from -300°F to 2000°F (-185°C to 1095°C).
Alloy 188 maintains excellent high-temperature strength even at elevated temperatures. The alloy exhibits excellent resistance to sulfate deposit hot corrosion and very good resistance to oxidizing environments. It also offers excellent resistance to molten chloride salts and good resistance to gaseous sulfidation.
Applications of Alloy 188
Alloy 188 is widely used in applications where materials are exposed to extreme heat, oxidation, and mechanical stress. Typical Alloy 188 applications include:
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Combustor liners and combustion cans in gas turbine engines
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Transition ducts and afterburner components
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Flame holders and spray bars
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Turbine rotors and nozzle diaphragm valves
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Furnace liners and flame hoods
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Jet engine components and heat shields
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Industrial furnace components
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High-temperature components in the aerospace industry
Alloy 188 is supplied to military and commercial aerospace, chemical processing, land-based gas turbines, and nuclear markets. It is a preferred material for components requiring exceptional strength, oxidation resistance, and reliability at elevated temperatures.
ZYTC Alloy – Your Trusted Alloy 188 Supplier
ZYTC Alloy has extensive experience in manufacturing and exporting Alloy 188. We recently completed a successful export order of Alloy 188 Plate to Japan, produced to AMS 5608 standards. The order included specifications of 9 × 914 × 914 mm and 12.7 × 914 × 914 mm, destined for turbine manufacturing – a specification repeatedly ordered by the customer.
Our Alloy 188 production follows rigorous standardized, process-driven, and professional manufacturing and inspection procedures. Every shipment of Alloy 188 undergoes third-party inspection and testing to ensure full compliance with AMS 5608 requirements before delivery to our customers.
Alloy 188 is one of our most mature and well-established materials, exported to multiple countries worldwide. We offer Alloy 188 in the following product forms:
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Alloy 188 Sheet and Alloy 188 Strip
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Alloy 188 Wire
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Alloy 188 Bar
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Alloy 188 Tube
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Alloy 188 custom components to drawings
We provide fast delivery, competitive pricing, and uncompromising quality for all Alloy 188 products. Whether you require standard dimensions or custom-fabricated Alloy 188 components, ZYTC Alloy is your reliable partner for cobalt-based superalloy solutions.
Contact ZYTC Alloy today for your Alloy 188 requirements.
