Haynes® 188 UNS R30188

Alloy 188 is a cobalt-nickel-chromium-tungsten super alloy combining excellent high-temperature strength with very good resistance to oxidizing environments up to 2100°F (1095°C).

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Strip, Foil, Wire, ASTM B551


Seal rings for gas turbine. Packing for gas turbines.


Alloy 188 is a cobalt-nickel-chromium-tungsten super alloy combining excellent high-temperature strength with very good resistance to oxidizing environments up to 2100°F (1095°C). It is readily fabricated and formed by
conventional techniques.

Chemistry Typical

Nickel: 20.00-24.00
Chromium: 20.00-24.00
Tungsten: 13.00-16.00
Iron: 3.00 max
Cobalt: Balance
Lanthanum: 0.02-0.12
Boron: 0.015 max
Carbon: 0.05-0.15
Manganese: 1.25max
Silicon: 0.2-0.5
Phosphorus: 0.02 max
Sulfur: 0.015 max

Physical Properties

Density, 0.324 lbs/in³, 8.98 g/cm³

Electrical Resistivity: µohm-in, (µohm-cm)
400°F (200°C): 41.5(105.0)
800°F (400°C): 43.8(110.5)
1000°F (600°C): 44.7(114.8)
1200°F (700°C): 45.6(116.4)
1400°F (800°C): 46.1(117.5)
1600°F (900°C): 46.5(118.3)
1800°F (1000°C): 46.7(119.1)

Mean Coefficient of Thermal Expansion: µin/in-°F (µm/m-°C)
70-800°F (20-500°C): 7.8(14.5)
70-1000°F (20-600°C): 8.2(15.2)
70-1200°F (20-700°C): 8.6(15.8)
70-1400°F (20-800°C): 9.0(16.5)
70-1600°F (20-900°C): 9.4(17.1)
70-1800°F (20-1000°C): 9.9(17.9)

Thermal Conductivity: BTU-in/ft-°F (W/m-°K)
800°F (400°C): 125(17.5)
1000°F (600°C): 138(21.1)
1200°F (700°C): 152(23.0)
1400°F (800°C): 167(24.8)
1600°F (900°C): 174(25.5)
1800°F (1000°C): 189(27.6)

Modulus of Elasticity: KSI (MPa)
33.6 x 10³(23.2 x 10³) in tension

Melting Range: 2400-2570°F (1315-1410°C)


Continuous Coils
Cut to lengths
Precision cutting

Mechanical Properties at Room Temperature

Properties: Annealed (Typical)
Ultimate Tensile Strength: 130 KSI min (896 MPa min)
Yield Strength (0.2% offset): 60 KSI min (414 MPa min)
Elongation: 45% min

Hot Tensile 1200°F (Typical)
Ultimate Tensile Strength: 90 KSI min (620 MPa min)
Yield Strength (0.2% offset): 35 KSI min (243 MPa min):


Gauges up to 0.020 inches: 35% min

Gauges over 0.020 inches: 20% min

Properties Tempered

Alloy 188 can be cold rolled to achieve the temper properties required by specific customers
and/or manufacturing requirements. Contact Ulbrich Wire for details.

Additional Properties

Corrosion Resistance
Refer to NACE (National Association of Corrosion Engineers) for recommendations.

Standard Wire Finishes

Extra Clean: (XC) Extra clean is also referred to as “bright annealed” or “bright annealed and cold

Grease (round wire only): Drawn in a heavy grease produces an “Ultra bright” finish for decorative
Soap (round wire only): Soap is used as a lubricant in the drawing process and is not removed. It
acts as a lubricant during customer part forming operation. A soap finish is available in tempered
Plated: Many plating options are available.
∗Special finishes are available: Contact Ulbrich Wire Sales with special finish and plating requests.

Limitation of Liability and Disclaimer of Warranty: In no event will Ulbrich Stainless Steels and
Special Metals, Inc., be liable for any damages arising from the use of the information included in
this document or that it is suitable for the ‘applications’ noted. We believe the information and
data provided to be accurate to the best of our knowledge but, all data is considered typical values
only. It is intended for reference and general information and not recommended for specification,
design or engineering purposes. Ulbrich assumes no implied or express warranty in regard to the
creation or accuracy of the data provided in this document.

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