About Alloy
HAYNES 244 alloy is a new Ni-Mo-Cr-W alloy developed for static parts in advanced gas turbine engines which require low thermal expansion at temperatures up to 1400°F (760°C). It offers a higher maximum use temperature than other low thermal expansion alloys currently available, including a 100-200°F (55-110°C) improvement over HAYNES 242 alloy. The alloy is age-hardenable by formation of Ni2 (Cr,Mo,W) domains, which are structurally similar to the strengthening domains in 242 alloy. Judicious alloying with tungsten increased the thermal stability of these domains and lowered the coefficient of thermal expansion. Other important properties such as oxidation resistance and low-cycle fatigue performance are comparable or better than those of 242 alloy.
Product Form
Plate/Sheet
Round Bar/Forgings
Chemical Composition
| Nickel: | Balance |
| Aluminum: | 0.5 max. |
| Carbon: | 0.03 max. |
| Chromium: | 8 |
| Iron: | 2 max. |
| Manganese: | 0.8 max. |
| Molybdenum: | 22.5 |
| Tungsten: | 6 |
Property
| Test Temperature | Yield Strength, 0.2% Offset | Ultimate Tensile Strength | Elongation | Reduction of Area | |||
| °F | °C | ksi | MPa | ksi | MPa | % | % |
| RT | RT | 121.2 | 836 | 195.0 | 1345 | 34 | 37 |
| 200 | 93 | 116.3 | 802 | 190.3 | 1312 | 39 | 41 |
| 400 | 204 | 110.3 | 761 | 181.6 | 1252 | 39 | 45 |
| 600 | 316 | 107.9 | 744 | 175.4 | 1209 | 41 | 44 |
| 800 | 427 | 100.0 | 689 | 170.4 | 1175 | 41 | 46 |
| 1000 | 538 | 99.3 | 685 | 164.2 | 1132 | 38 | 43 |
| 1100 | 593 | 97.5 | 672 | 156.3 | 1078 | 32 | 32 |
| 1200 | 649 | 93.8 | 647 | 141.4 | 975 | 21 | 24 |
| 1300 | 704 | 84.8 | 585 | 125.6 | 866 | 18 | 20 |
| 1400 | 760 | 67.2 | 463 | 105.0 | 696 | 44 | 37 |
| 1500 | 816 | 37.1 | 256 | 72.0 | 463 | 106 | 70 |
| 1600 | 871 | 34.8 | 240 | 54.1 | 354 | 124 | 84 |
| 1700 | 927 | 38.2* | 263* | 42.4* | 208* | 161* | 89* |
| 1800 | 983 | 24.0 | 165 | 30.4 | 210 | 141 | 94 |
Application
Gas Turbine Engines: Haynes 244 is used to manufacture critical components in gas turbine engines, such as combustors, liners, and transition ducts. The alloy's high-temperature strength and resistance to oxidation and corrosion make it ideal for these applications.
Chemical Processing Equipment: Haynes 244 is used in the construction of chemical processing equipment, such as reactors, vessels, and heat exchangers. The alloy's resistance to corrosion and high-temperature strength make it suitable for handling corrosive chemicals and operating at elevated temperatures.
Power Generation: Haynes 244 is used in power generation equipment, such as steam turbines and boilers. The alloy's high-temperature strength and resistance to corrosion make it suitable for use in these applications, where high-pressure steam and corrosive gases are present.
Aerospace: Haynes 244 is used in the manufacture of aircraft engine components, such as turbine blades and vanes. The alloy's high-temperature strength and good fabricability make it ideal for these applications, where precision and reliability are critical.
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