Haynes 242 (® Haynes International)

UNS N10242

Haynes® 242® alloy (UNS N10242) is an age-hardened nickel-molybdenum chromium alloy which derives its strength from a long-range ordering reaction upon aging. It has tensile and creep strength properties up to 1300°F (705°C) which are as much as double those for solid solution strengthened alloys, but with high ductility in the aged condition. The thermal expansion characteristics of Haynes® 242® alloy are much lower than those for most other alloys, and it has very good oxidation resistance up to 1500°F (815°C). Other attractive features include excellent low cycle fatigue properties, very good thermal stability, and resistance to high-temperature fluorine and fluoride environments.

Haynes® 242® alloy combines properties that make it ideally suited for a variety of component applications in the aerospace industry. It will be used for seal rings, containment rings, duct segments, casings, fasteners, rocket nozzles, pumps, and many others. In the chemical process industry, Haynes® 242® alloy will find use in high-temperature hydrofluoric acid vapor-containing processes as a consequence of its excellent resistance to that environment. The alloy also displays excellent resistance to high-temperature fluoride salt mixtures. The high strength and fluorine environment-resistance of Haynes® 242® alloy has also been shown to provide for excellent service in fluoroelastomer process equipment, such as extrusion screws.

Haynes 242 Fasteners

  • Lock Nuts
  • Set Screws
  • Dowel Pins
  • Pipe Plugs
  • Vented Screws
  • 12-Pt Flange Screws
  • Custom Fasteners


  • Plate, Sheet & Strip: ASTM B434, ASME SB434
  • Rod & Bar: ASTM B573, ASME SB573
  • Seamless Pipe & Tube: ASTM B622, ASME SB622
  • Welded Pipe & Tube: ASTM B619, ASME SB619
  • Fittings: ASTM B366, ASME SB366
  • Forgings: ASTM B564, ASME SB564

Material Properties

Material Properties: Alloy 242

Technical Data Sheet

Technical Data Sheet

Industries & Applications

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