Alloy 188

Cobalt alloy Alloy 188 – properties, applications and technical data

Alloy 188, also known as HAYNES® 188, is a cobalt-based superalloy developed for very high temperatures and demanding oxidation environments.

The alloy combines excellent oxidation resistance, good strength at high temperatures and very good corrosion resistance in aggressive environments.

Alloy 188 is often used in gas turbines, the aerospace industry and industrial high-temperature applications where materials are exposed to extreme heat, oxidation and mechanical stress.

Properties of Alloy 188

Alloy 188 is a cobalt-nickel-chromium-tungsten alloy that offers very good oxidation resistance at temperatures up to approximately 1100 °C.

The alloy is particularly appreciated in components where high temperature stability and good resistance to thermal fatigue are essential.

Type: cobalt-based high temperature alloy
Alloy: Co-Ni-Cr-W
Structure: cobalt-based solid solution alloy
Designations: Alloy 188, Haynes 188, UNS R30188, W.Nr. 2.4683
Typical composition: Co balance, Ni ~22%, Cr ~22%, W ~14%

Advantages

Excellent oxidation resistance at very high temperatures
Good strength at high temperatures
Very good corrosion resistance
Resistance to thermal fatigue
Stable structure under prolonged exposure to heat

Limitations

Higher material cost than standard alloys
Machining can be more demanding
Not optimal in applications where low weight is crucial

Common product forms for Alloy 188

Sheet and strip
Round bar
Wire
Forgings
Special dimensions according to drawing

Typical components manufactured in Alloy 188

Combustion chambers in gas turbines
Jet engine components
Heat shields
High temperature components in the aerospace industry
Industrial furnace components

Corrosion and oxidation resistance

Alloy 188 offers very good oxidation resistance at temperatures up to approximately 1100 °C.

The alloy also has good corrosion resistance in many high-temperature environments and is often used in components exposed to both heat and chemical attack.

Environments where Alloy 188 performs well

Gas turbines
Aerospace
High-temperature furnaces
Energy and power generation

Environments to avoid

Applications where simpler nickel or cobalt alloys are sufficient
Environments where low cost is more important than high-temperature performance

Technical data

Yield limit (0.2%)	~450 MPa
Tensile strength	~960 MPa
Elongation	~45 %
Density	~9.14 g/cm³
Modulus of elasticity	~210 GPa
Maximum working temperature	up to ~1100 °C depending on application

With a global network of suppliers, we can offer Alloy 188 in technical dimensions for demanding high-temperature applications.

Supplier of Alloy 188 with certified quality

HARALD PIHL is one of Europe's largest suppliers of special alloys, including cobalt-based high-temperature alloys such as Alloy 188.

With over 100 years of experience in the metal industry, we deliver materials with full traceability and certification according to EN 10204 3.1 / 3.2 as well as relevant ASTM and ISO standards.

Cutting, testing and quality assurance are done in-house to ensure correct tolerances and fast global delivery for technically demanding projects.

Europe's largest stock of nickel and titanium alloys
Special alloys from stock
ASTM / ISO standards
Top quality for safety-critical applications
Fast global delivery
Full material certification (EN 10204 3.1 / 3.2)
Over 100 years in the metal industry
Nickel and titanium experts

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