Principal Features

HAYNES® 233® alloy is a new Ni-Co-Cr-Mo-Al alloy that offers excellent oxidation resistance at temperatures up to 2100°F (1149°C) or higher coupled with superior creep strength – a combination of properties never before achieved in a readily fabricable alloy. The alloy obtains its exceptional oxidation resistance through the formation of a protective alumina layer, while the high creep strength is a result of solid-solution and carbide strengthening. Additionally, for use in intermediate temperature applications the alloy can be age-hardened by heat treatment to produce even greater strength. Finally, the alloy can be readily fabricated using conventional methods since it exhibits good hot workability, cold formability, and weldability. Potential applications include hot gas components in aerospace and industrial gas turbines, industrial heating fixtures and sensors, and various structural components in the emerging technology market. Preliminary results from mill products are provided below.

This product will be available in various forms including sheet, plate, billet, bar, wire, etc. Sample material is available upon request. For more information on 233® alloy, please contact Victor Paramo at 765-456-6226 or [email protected].

*Please contact our technical support team if you have technical questions about this alloy.

Nominal Composition

Weight %
Nickel 48 (Balance)
Chromium 19
Cobalt 19
Molybdenum 7.5
Titanium 0.5
Aluminum 3.25
Iron 1.5 max.
Manganese 0.4 max.
Silicon 0.20 max.
Carbon 0.10
Boron 0.004
Tantalum 0.6
Tungsten 0.3 max.
Yttrium 0.025 max.
Zirconium 0.03

Oxidation Resistance

2100°F (1149°C) in Air for 1,008 h – Cycled Weekly

 

Alloy Metal LossAvg. Metal Affected

Alloy Metal Loss Avg. Metal Affected
mils/side (μm/side) mils/side (μm/side)
214® 0.1 (3) 0.5 (13)
233® 0.2 (5) 0.5 (13)
230® 1.2 (30) 4.4 (112)
617 1.0 (25) 5.2 (132)
X 3.6 (91) 6.1 (155)

*Average Metal Affected = Metal Loss + Internal Attack

 

Solution Annealing

Typical Solution Annealing Temperature: 2125 to 2150°F (1163 to 1177°C).

Material Properties

Density
0.296 lb/in3
8.18 g/cm3
Melting Range 2422 – 2532°F 1328 – 1389°C
Gamma-Prime Solvus 1767°F 964°C

 

Creep Strength

Comparative Time to Produce 1% Creep (Sheet)

Physical Properties

Temperature (°F) Specific Heat(BTU/lb-°F)
Thermal Conductivity(BTU-in./ft2-hr.-°F)
Thermal Diffusivity(ft2/h)
Electrical Resistivity(microhms-in.) Mean Coefficient ofThermal Expansion(min/in-°F)
1000 0.127 125 0.162 53.5 7.5
1200 0.131 138 0.173 54.4 7.8
1400 0.135 153 0.187 53.8 8.2
1600 0.137 148 0.177 52.5 9
1800 0.139 157 0.185 51.3 9.7
2000 0.142 166 0.193 51.5 10
Temperature (°C) Specific Heat(J/kg-°C) Thermal Conductivity(W/m-°C)
Thermal Diffusivity(cm2/s)
Electrical Resistivity(microhms-cm) Mean Coefficient ofThermal Expansion(mm/m-°C)
500 526 17.6 0.043 135 13.4
600 541 19.1 0.0407 137 13.8
700 555 21 0.0446 138 14.4
800 566 21.8 0.0486 136 15.3
900 575 21.7 0.0481 133 16.6
1000 584 22.9 0.0501 130 17.6

Tensile Properties Age Hardened

HAYNES® 233® alloy can be age-hardened to increase strength at temperatures below the gamma-prime solvus. The data below was from HAYNES® 233® sheet material age-hardened at 1650°F/4h/AC + 1450°F/8h/AC (899°C/4h/AC + 788°C/8h/AC).

Temperature 0.2% Yield Strength Ultimate Tensile Strength Elongation
°F °C ksi MPa ksi MPa %
RT RT 112.9 778 172.2 1187 27.3
1000 538 102.2 704 147 1014 25.8
1200 649 95.5 658 156.6 1079 25.5
1400 760 97.4 671 116.5 804 27.4
1500 816 82 565 92.3 637 21.6

Disclaimer

Haynes International makes all reasonable efforts to ensure the accuracy and correctness of the data displayed on this site but makes no representations or warranties as to the data’s accuracy, correctness or reliability. All data are for general information only and not for providing design advice. Alloy properties disclosed here are based on work conducted principally by Haynes International, Inc. and occasionally supplemented by information from the open literature and, as such, are indicative only of the results of such tests and should not be considered guaranteed maximums or minimums.  It is the responsibility of the user to test specific alloys under actual service conditions to determine their suitability for a particular purpose.

For specific concentrations of elements present in a particular product and a discussion of the potential health affects thereof, refer to the Safety Data Sheets supplied by Haynes International, Inc.  All trademarks are owned by Haynes International, Inc., unless otherwise indicated.

Alloy Brochure

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