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About 4130 (E4130) Alloy Steel

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About 4130 (E4130) Alloy Steel

Aircraft quality 4130 alloy steel is a medium carbon, low alloy steel containing 0.15/0.25% molybdenum and 0.80/1.10% chromium as strengthening agents. This type of steel is also commonly referred to as a chromoly steel, or chrome moly steel. Due to its relatively low carbon content of 0.28/0.33%. These 4130 steel properties offer exceptional weldability. With the proper heat treatment it is also readily machined. Annealing 4130 (E4130) alloy steel offers excellent ductility. 4130 steel can also be normalized or otherwise heat treated. Steel 4130 (E4130) has an excellent strength to weight ratio and is considerably stronger and harder than other standard grades of steel. Chromoly steels are especially useful in their ability to retain their bulk properties while allowing for significant hardness to be attained.

 

SAE 4130 Steel Chemical Composition: Typical Chemical Properties (%)

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