Alloy Steel 4120

Alloy Steel 4120, also sold as SAE/AISI 4120, is a chromium-molybdenum structural alloy steel. This case-hardened alloy offers users good strength, toughness, and wear-resistance. Leaders in a wide variety of industries, including aerospace, oil and gas, automotive, agricultural and defense, rely on Alloy Steel 4120 for critical products and parts such as:

  • Piston pins
  • Crankshafts
  • Forgings
  • Structural tubing
  • Frames
  • Gears
  • Flywheel components

To be sold as Alloy Steel 4120, an alloy must consist of a specific chemical composition that includes:

  • Fe Balance
  • C 0.15-0.20%
  • Si 0.20-0.35%
  • Mo 0.20-0.30%
  • P .040% max
  • S .040% max

Continental Steel offers Alloy Steel 4120 in a number of different sizes and shapes including rounds, bars, and plates. All of our Steel Alloy 4120 meets or exceeds the leading industry standards like ASTM, UNS, DIN, ISO, BS, and more. To learn more about our selection of Alloy Steel 4120 or any of our other high-quality alloy steel products, please contact the experts at Continental Steel today.

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