Haynes® Alloy 188

---

Applications

Combustor liners and cans, furnace liners, flame hoods, gas turbine rotors, and nozzle diaphragm valves.

Description

Haynes^® Alloy 188 is a cobalt-nickel-chromium-tungsten alloy with excellent high temperature tensile strength, sulfidation, and oxidation resistance up to 1095°C (2000°F) for long term exposures. Haynes^® Alloy 188 is not age hardenable, but may be cold worked to achieve higher tensile and yield strength. Haynes^® Alloy 188 responds well to conventional forming and welding techniques.

Industries Supplied

Military and Commercial Aerospace, Chemical Processing, Land-Based Gas Turbines, and Nuclear markets.

Nominal Composition

C: 0.05 – 0.15
Mn: 1.25 max
P: 0.02 max
S: 0.015 max
Si: 0.20 – 0.50
Cr: 21.0 – 23.0 
Ni: 20.0 – 24.0 
Co: balance 
B: 0.015 max
Fe: 3.0 max
W: 13.0 – 15.0 
La: 0.03 – 0.15 

Physical Properties

Density: 0.3251 lb/in³, (9 g/cm³)

Modulus of Elasticity (E): 
At 70°F (20°C): 34 x 10³ ksi (232 GPa)

Modulus of Rigidity (G)
At 70°F (20°C): 14 x 10³ ksi (93 GPa)

Coefficient of Expansion:
6.6 µin/in.-°F (70°F to 1000°F)
12 µm/m-°C (20°C to 538°C)

Electrical Resistivity: 0.0394 µΩ.in, (0.1 µΩ.cm)

Thermal Conductivity: 73 Btu-in/ft²hr-°F, (10 W/m-K)

Applicable Specifications

Strip and Foil: AMS 5608, GE B50A712, PWA 1042, Rolls Royce MSRR 7165

Typical Mechanical Properties

• Annealed
  • Heat Treatment: Per AMS 5608
  • Tensile Strength: 130-160 ksi (900-1100 MPa) 
  • Suggested Operating Conditions: -300°F to 2000°F (-185°C to 1095°C)
• Spring Temper
  • Heat Treatment: None
  • Tensile Strength: Up to 250 ksi (1725 MPa) 
  • Suggested Operating Conditions: -300°F to 2000°F (-185°C to 1095°C)

---

Haynes^® is a registered trademark of Haynes International, Inc.

For further information Contact:

Email: stripinfo@elgiloy.com
Phone: 1 888 843 2350 
Elgiloy Specialty Metals – Strip Products
1565 Fleetwood Dr.
Elgin, IL 60123 USA