X
Alloy X is one of the most widely used nickel base superalloys for gas turbine engine components. This solid solution strengthened grade has good strength and excellent oxidation resistance to 2000°F. Alloy X has excellent resistance to reducing and carburizing atmospheres, making it suitable for furnace components. Due to its high molybdenum content, Alloy X may be subject to catastrophic oxidation at 2200°F.
Alloy X is welded by all common methods such as gas tungsten arc, gas metal arc, shielded metal arc, electron beam and resistance welding. Use matching filler metal, keep interpass temperature low. After severe forming, fabrications may be annealed 2150°F, 15 minutes per 1/8" of thickness, rapid air cool.
Chemistry
| Cr | Mo | Co | W | Al | Ti | B | C | Fe | Mn | Si | P | S | Cu | Ni | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MIN | 20.5 | 8.0 | 0.5 | 0.2 | - | - | - | 0.05 | 17.0 | - | - | - | - | - | - |
| MAX | 23.0 | 10.0 | 2.5 | 1.0 | 0.5 | 0.15 | 0.01 | 0.15 | 20.0 | 1.0 | 1.0 | 0.04 | 0.03 | 0.5 | Balance |
Specifications
AMS 5536, AMS 5754, AMS 5798
ASME SB 435, ASME SB 572, ASME Section IX P No. 43
ASTM B 435, ASTM B 572
EN 2.4665
GE B50A436, GE B50T83, GE B50TF24
MSRR 7127
PDS 1038 (X-low), PDS 15102QFC
UNS N06002
Werkstoff 2.4665
Inventory
X Coil, X Plate, X Sheet, X Welding Products
Common Trade Names
Alloy X, Hastelloy® X
Features
- Good high temperature strength
- Oxidation resistance through 2000°F
- Carburization resistant
Applications
- Combustion liners
- Turbine exhaust components
- Aircraft cabin heaters
- Transition Ducts
Physical Properties
Density: 0.297 lb/inch3
Melting Point: 2300 - 2470°F
| Temperature, °F | 70 | 1000 | 1200 | 1400 | 1600 | 1800 |
| Coefficient* of Thermal Expansion, in/in°F x 10-6 | - | 8.4 | 8.6 | 8.8 | 9.0 | 9.2 |
| Thermal Conductivity Btu • ft/ft2 • hr • °F |
- | 11.3 | 12.7 | 13.9 | 15.2 | 16.4 |
| Modulus of Elasticity, Dynamic psi x 106 | 30 | 26 | 25 | 23 | 22 | 20 |
* 70°F to indicated temperature.
Mechanical Properties
Representative Tensile Properties
| Temperature, °F | 70 | 1000 | 1200 | 1400 | 1600 |
| Ultimate Tensile Strength, ksi | 111 | 89 | 83 | 67 | 45 |
| 0.2% Yield Strength, ksi | 55 | 36 | 35 | 34 | 28 |
| Elongation, % | 44 | 49 | 54 | 53 | 58 |
Typical Stress-Rupture Strength Plate & Bar, Stress To Rupture At Indicated Time
| Temperature, °F | 1200 | 1500 | 1800 |
| 100 Hours, ksi | 48 | 14 | 4.0 |
| 10,000 Hours, ksi | 34 | 10 | 2 |
® Hastelloy is a registered trademark of Haynes International