HAYNES® 233® alloy
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 Vinay Deodeshmukh at 765-456-6212 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
3.3
Iron
1.5 max.
Manganese
0.4 max.
Silicon
0.20 max.
Carbon
0.1
Boron
0.004
Tantalum
0.5
Tungsten
0.3 max.
Yttrium
0.025 max.
Zirconium
0.03
Weight % | |
Nickel | 48 (Balance) |
Chromium | 19 |
Cobalt | 19 |
Molybdenum | 7.5 |
Titanium | 0.5 |
Aluminum | 3.3 |
Iron | 1.5 max. |
Manganese | 0.4 max. |
Silicon | 0.20 max. |
Carbon | 0.1 |
Boron | 0.004 |
Tantalum | 0.5 |
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.