Aircraft Alloys / 52100 VM SPH ANN

52100 Spheroidize Annealed Vac Melt is an aircraft quality high carbon, chromium alloy steel that provides deep hardening traits and high wear resistance. This material is usually produced using Vacuum Induction Melt (VIM), and then remelted via Consumable Electrode Vacuum Arc Remelting (VAR) to meet the bearing manufactures demands for clean material with uniform microstructure. Spheroidize annealing is then performed to improve cold formability and machinability. Once this alloy is machined, a second heat treatment is usually performed to provide a hard wear resistant surface. 52100 is often used to produce bearings in rotating machinery throughout several industries. (UNS G5296)

Chemical Makeup

Element Min Max
Carbon, C 0.93 1.05
Manganese, Mn 0.25 0.45
Silicon, Si 0.15 0.35
Phosphorus, P - 0.015
Sulfur, S - 0.015
Chromium, Cr 1.35 1.6
Molybdenum, Mo - 0.1
Nickel, Ni - 0.25
Copper, Cu - 0.3
Aluminum, Al - 0.05
Oxygen, O - 0.0015

Common Applications

  • Aerospace Aerospace
  • Defense Defense
  • Industrial Industrial


  • High Hardness
  • High Wear Resistance
  • Good Machinability

We stock 52100 VM SPH ANN to the following specifications:

  • AMS-2300
  • AMS-6440
  • AMS-6444
  • AMS-S-7420
  • MIL-S-7420

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

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