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4130 is a Chromium-Molybdenum alloy steel. It is one of the most used aircraft steels because of 4130’s ease of manufacturing and weldability. It is also known for its hardenability, strength and ductility. If additional abrasion and wear resistance are needed this material can be provided in a nitrided condition.

Chemical Properties

Element min max
Carbon 0.28 0.33
Manganese 0.40 0.60
Silicon 0.15 0.35
Phosphorus — 0.025
Sulfur — 0.025
Chromium 0.80 1.10
Molybdenum 0.15 0.25
Nickel — 0.25
Copper — 0.35

Mechanical Properties, Longitudinal , Minimum (Hardened and Tempered)

Property Value
Tensile strength 125 ksi
Yield strength at 0.2% Offset 100 ksi
Elongation in 4D 17%
Reduction of Area 55%