4130 Steel (Chromoly)

UNS G41300 low_alloy_steel
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Quick answer

4130 Steel (Chromoly) is a low alloy steel specified by AMS 6350, AMS 6351, ASTM A29, MIL-S-6758. Typical composition: .

Chromium-molybdenum low-alloy steel offering an excellent combination of weldability, strength, and toughness. Widely used in aircraft structures and motorsport roll cages.

Applicable Standards

  • AMS 6350
  • AMS 6351
  • ASTM A29
  • MIL-S-6758

Composition Ranges (wt %)

Element Min (%) Max (%) Typical Range
Fe 96.0 99.0 ~97.5
Cr 0.8 1.1 ~0.95
Mo 0.15 0.25 ~0.2
Mn 0.4 0.6 ~0.5
C 0.28 0.33 ~0.31
Si 0.15 0.35 ~0.25
Fe 96.0–99.0% Cr 0.8–1.1% Mo 0.15–0.25% Mn 0.4–0.6% C 0.28–0.33% Si 0.15–0.35%

Typical Applications

  • Aircraft fuselage structures
  • Motorsport roll cages
  • Bicycle frames
  • Hydraulic tubing and pressure vessels

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