Strip – HAYNES®233® alloy

Strip – HAYNES®233® alloy

HAYNES®233® alloy

UNS R30188
W.Nr 2.4683


Gas turbine components, Industrial heating fixtures, Structural components
Industries supplied include: Aerospace, Industrial Heat Treating, Power Generation


HAYNES® 233® alloy is a new Ni-Cr-Co-Mo-Al alloy formulated with excellent creep strength (akin to HAYNES 230® alloy) and with oxidation resistance approaching that of HAYNES 214® alloy. The alloy is also readily fabricable, exhibiting good hot workability, cold formability, and weldability. The alloy obtains its oxidation resistance via the formation of a protective alumina layer and high creep strength through solid solution and carbide strengthening. The alloy can be age hardened by heat treatment to produce even greater strength.

Industries Supplied

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

Nominal Composition

C: 0.05 – 0.12
Mn: .10  – .40
Si: 0.040 – 0.20
Cr: 18.0 – 20.0
Ni: balance
Co: 18.0 – 20.0

Mo 7.0 – 8.0

B: 0.006 max
Fe: 1.50 max

Ti:  0.40 – 0.60

Al:  3.0 – 3.5

Ta:  0.40 – 0.80
W: 0.30 max

Zr:  0.050 max

Y:  0.025 max

Physical Properties at 70º

Density: 0.296 lb/in3, (9 g/cm3)

Coefficient of Expansion:  7.8 microinches/in.-ºF (1200ºF)

Electrical Resistivity: 54.4 µohm.in, (0.1 µΩ.cm)

Thermal Conductivity: 138 Btu-in/ft2hr-°F, (10 W/m-K)

Physical Properties at 20º

Density:  8.18 g/cm3

Coefficient of Expansion:  13.8 µm/m-ºC (600ºC)

Electrical Resistivity:  137 µohm-cm

Thermal Conductivity:  19.1 W/m-K

Applicable Specifications

Strip and Foil: N/A

Typical Mechanical Properties

  • Annealed
    • Heat Treatment:  2125 – 2150º (1163 – 1177º)
    • Tensile Strength: 140 ksi (965 MPa)
    • Suggested Operating Conditions:  70°F to 1400°F (20°C to 760°C)
  • Age Hardened
    • Heat Treatment: 1650°F/4h/AC + 1450°/8h/AC (899° C/4h/AC + 788°C/8h/AC)
    • Tensile Strength:  170 ksi (1172MPa)
    • Suggested Operating Conditions: 70°F to 1400°F (20°C to 760°C)

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

For further information Contact:

Contact Us
Phone: 1 888 843 2350
Elgiloy Specialty Metals – Strip Products
1565 Fleetwood Dr.
Elgin, IL 60123 USA

Limitation of Liability and Disclaimer of Warranty:

  • The content in these data sheets is provided primarily by third-party melting mills and is provided for reference only.  It is not intended for engineering or design.
  • Applications may be discussed, however, Elgiloy Specialty Metals, a Division of Combined Metals of Chicago L.L.C., does not recommend or endorse any material for any particular end use or application.
  • The data included in this data sheet are typical values and may vary.
  • Elgiloy Specialty Metals, a Division of Combined Metals of Chicago L.L.C., makes no representations or warranties, express or implied, as to the accuracy, completeness, condition, suitability, performance, fitness for a particular purpose, or merchantability of any information contained in any data sheet.

In no event will Elgiloy Specialty Metals, a Division of Combined Metals of Chicago L.L.C., be liable for any damages whatsoever arising from the use of the information included in the data sheets.