Hastelloy W (UNS N10004)

Hastelloy W alloy (UNS N10004) is a solid-solution-strengthened super alloy that was developed primarily as a filler metal for welding of dissimilar alloys. It displays excellent dissimilar welding characteristics, and is widely used for that purpose in the gas turbine and aerospace industries. The properties of dissimilar weld joints made with alloy W are dependents upon the alloys joined, but are generally acceptable for a wide variety of combinations. Alloy W is also used as a wrought alloy for a limited number of ring-type Applications in older gas turbine engines. Haynes 242 alloy is a more modern alloy, and should be considered as a substitute for alloy W in these ring Applications.

Equivalent Grades

Hastelloy WHastelloy WN10004

Chemical Composition, %

Hastelloy W≤0.12≤1.00≤1.00≤0.04≤0.034.0-6.0Bal≤2.523.0-26.0≤1.00≤0.064.0-7.0

Typical Physical and Mechanical Properties (RT, Annealed)

Density, g/cm3Melting Point, ℃Tensile Strength, MPaYield Strength, MPaELongation, %Hardness, HRB

Available Products and Specifications

Rod, Bar, Wire and ForgingsAMS 5786, AMS 5755
Plate, Sheet and Strip
Pipe and Tube
Welding ProductAWS A5.14 ERNiMo-3


  • Excellent dissimilar welding characteristics
  • Hastelloy W is oxidation resistant to 760℃
  • High temperature and thermal fatigue strength


Hastelloy W is widely used for that purpose in gas turbines, aerospace and chemical process industries.