Aircraft Alloys / D-6AC VAC MELT N&T

D-6AC Vac Melt Normalized & Tempered is a premium aircraft quality medium carbon alloy that provides ultra-high strength for structural applications. This material is usually melted in an Electric Furnace, and then remelted via Consumable Electrode Vacuum Arc Remelting. This produces a much cleaner steel meeting the magnetic particle test requirements of AMS-2300. The normalized and tempered condition provides the best machinability. This steel provides a high yield strength to tensile strength ratio, combined with good ductility. D6AC can be heat treated to strengths ranging from 180 to 260 ksi. Alloy D-6AC is often used in the aerospace industry to produce shafts, axles and parts for landing gears. (UNS K24728)

Chemical Makeup

Element Min Max
Carbon, C 0.45 0.5
Manganese, Mn 0.6 0.9
Silicon, Si 0.15 0.3
Phosphorus, P - 0.01
Sulfur, S - 0.01
Chromium, Cr 0.9 1.2
Molybdenum, Mo 0.9 1.1
Nickel, Ni 0.4 0.7
Copper, Cu - 0.35
Vanadium, V 0.08 0.15

Common Applications

  • Aerospace Aerospace
  • Defense Defense


  • Ultra High Strength
  • Good Machinability
  • Good Ductility
  • High Yeild Strength
  • High Tensile Strength

We stock D-6AC VAC MELT N&T to the following specifications:

  • AMS-2300
  • AMS-6431
  • AMS-S-8949 EXC. SONIC
  • FMS-1011 EXC. SONIC
  • GM-1013 EXC. SONIC
  • LCM-05-2190
  • MIL-S-8949 EXC. SONIC
  • STM-05-500

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

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