Alloy X / Hastelloy X

Alloy X / Hastelloy 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

 CrMoCoWAlTiBCFeMnSiPSCuNi
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 5536AMS 5754AMS 5798
ASME SB 435ASME SB 572ASME Section IX P No. 43ASME SFA 5.14
ASTM B 435ASTM B 572
EN 2.4665
GE B50A436GE B50T83GE B50TF24
PDS 1038 (X-low)PDS 15102QFC
UNS N06002
Werkstoff 2.4665

Inventory

L’alliage X Coil, L’alliage X Plate, L’alliage X Round Bar, L’alliage X Sheet, L’alliage 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