Aircraft Alloys / HY-TUFF N & T

HyTuf Normalized & Tempered is a high strength alloy with the addition of Molybdenum to further improve the steels toughness properties. This alloy provides good ductility, fracture toughness, and impact strength. The Normalized & Tempered condition offers optimal machinability before heat treat. HyTuf is typically used in products that require a 220 to 240 ksi tensile strength range. This material is often used for aircraft landing gear, flap tracks and other structural applications within the aerospace industry. (UNS K32550)

Chemical Makeup

Element Min Max
Carbon, C 0.23 0.28
Manganese, Mn 1.2 1.5
Silicon, Si 1.3 1.7
Phosphorus, P - 0.025
Sulfur, S - 0.025
Chromium, Cr 0.2 0.4
Molybdenum, Mo 0.35 0.45
Nickel, Ni 1.65 2
Copper, Cu - 0.35

Common Applications

  • Aerospace Aerospace
  • Defense Defense


  • High Strength
  • Good Ductility
  • Fracture Toughness
  • Impact Strength
  • Good Machinability

We stock HY-TUFF N & T to the following specifications:

  • AMS-2301
  • AMS-2304
  • AMS-6418
  • AMS-S-7108
  • ASTM-A-322
  • DMS-1841 GRD B
  • MIL-S-7108

Click on a cross-section to see the sizes we stock:

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