4130 Normalized - Aircraft Alloys - Fry Steel

Aircraft Alloys / 4130 NORM

4130 normalized is an aircraft quality chromium-molybdenum alloy steel primarily melted in an electric air furnace. This alloy has a maximum carbon content of 0.33 and is considered a low carbon steel. It is an exceptional welding steel and readily machined in its normalized/tempered condition. 4130 normalized steel is easily cold worked, hot worked, and forged, but cannot be aged. It has excellent ductility when annealed and is a through-hardening alloy capable of developing hardness as high as 35 HRC 4130, also known as Chromoly Steel, is often used in the construction of commercial aircrafts, military aircrafts, ground support systems, race cars, off road vehicles, hydraulic tools, and machine tool applications. (UNS G41300)

Chemical Makeup of 4130 Steel Alloy

Element Min Max
Carbon, C 0.28 0.33
Manganese, Mn 0.4 0.6
Silicon, Si 0.15 0.35
Phosphorus, P - 0.025
Sulfur, S - 0.025
Chromium, Cr 0.8 1.1
Molybdenum, Mo 0.15 0.25
Nickel, Ni - 0.25
Copper, Cu - 0.35
Aluminum, Al 0.02 0.05
Vanadium, V 0.02 0.08
Columbium/Niobium, Nb 0.02 0.05

Common Applications of Alloy Steel 4130

  • Aerospace Aerospace
  • Industrial Industrial


  • Great Ductility
  • Capable Of High Toughness
  • Good Weldability

We stock 4130 NORM to the following specifications:

  • AMS-2301
  • AMS-2304
  • AMS-6348
  • AMS-6370
  • AMS-S-6758
  • ASTM-A-322
  • ASTM-A-331
  • MIL-S-6758

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

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