Hastelloy X Description

We are a leading supplier of Hastelloy X, also know as Alloy X®, in a variety of specifications including AMS 5754 and AMS 5536. Hastelloy X is a nickel-based superalloy ideal for gas turbine engine, aircraft, industrial furnace, and chemical processing applications. Gas turbine engines use Hastelloy X flame holders, spray bars, transition ducts, combustor cans and other combustion-related parts. Alloy X also performs well in aircraft parts, including jet engine tailpipes, afterburner components, and cabin heaters.

Alloy X is known for its excellent high temperature strength withstanding up to 2200°F. The alloy can also be easily fabricated with forming and welding characteristics by both manual and automatic methods. Additionally, Hastelloy X is corrosion resistant, heat resistant and oxidation resistant, being able to withstand reducing or neutral atmospheres and oxidation.

Hastelloy X General Properties

Alloy X offers exceptional performance in furnace rolls or other industrial furnace applications because of the alloy’s strong resistance to oxidizing, reducing and neutral atmospheres. In addition, Hastelloy X is widely used for a variety of chemical processing parts, including retorts, pyrolysis tubing, and muffles due to its exceptional resistance to stress-corrosion cracking.


Hastelloy X Nickel Based Superalloy

Hastelloy X is a nickel-chromium-molybdenum alloy with cobalt and tungsten added. Hastelloy X alloy has excellent oxidation resistance at high temperatures up to 1200°C and can also be used in neutral and reducing atmospheres. At the same time, Hastelloy X alloy can resist carbonization and nitriding atmosphere. Hastelloy X has good oxidation and corrosion resistance, moderate durability and creep strength at 900°C, good cold and hot processing formability and welding performance. It is suitable for the manufacture of combustion chamber parts and other high-temperature parts of aero-engines. It can be used for a long time below 900°C, and the short-term working temperature can reach 1080°C.

Hastelloy X Chemical Composition:

Mo Cr Fe W Co Mn C P S Si Al Ti B Cu
8.0-10.0 20.5-23.0 17.0-20.0 0.2-1.0 0.5-2.5 1.0 max 0.05-0.15 0.04 max 0.03 max 1.0 max 0.50 max 0.15 max 0.01 max 0.50 max

Hastelloy X Mechanical Properties:

Representative Tensile Properties, sheet

Temp°F Tensile (psi) 0.2% Yield (psi) Elongation in 2%
70 110,600 54,900 44
1000 89,000 35,600 49
1200 83,000 35,400 54
1400 67,000 34,400 53
1600 45,000 28,200 58

Hastelloy X process performance and requirements:

  1. The alloy has good cold and hot workability, and the forging heating temperature is 1170℃.
  2. The average grain size of the alloy is closely related to the degree of deformation of the forging and the final forging temperature.
  3. The alloy has satisfactory welding performance and can be welded by argon arc welding, seam welding, spot welding and other methods.
  4. The alloy can be directly added to the furnace that has been heated to the highest working temperature. After the necessary time for heat preservation, it will be released from the furnace and processed to the specified specifications. If the metal temperature drops below the minimum processing temperature, it needs to be heated again.
  5. The adhesion of the surface oxide of the alloy and the welding slag around the weld is stronger than that of stainless steel. It is recommended to use a fine-grained abrasive belt or a fine-grained grinding wheel for grinding.

Hastelloy X Heat Treatment:

Wrought forms of HASTELLOY® X alloy are furnished in the solution heat-treated condition unless otherwise specified. X alloy is typically solution heat-treated at 2150°F (1177°C) and rapid cooled. Bright annealed products are cooled in hydrogen. Annealing at temperatures lower than the solution heat- treating may cause precipitation of secondary phases, which may affect the alloy’s strength and ductility.

Hastelloy X application:

  • Industrial and aviation steam turbines (combustion chamber, rectifier, structural cover)
  • Industrial furnace parts, support rollers, grids, ribbons and radiant tubes
  • Spiral tube in petrochemical furnace
  • High temperature gas cooled nuclear reactor