About

CNC machined Steel 4340 is a high-strength nickel-chromium-molybdenum alloy steel designed for applications requiring exceptional toughness, fatigue resistance, and mechanical durability. Known for its superior hardenability and strength compared to many other alloy steels, Steel 4340 is widely used in critical structural and high-performance engineering applications.

The material provides an outstanding combination of strength, toughness, and impact resistance, making it suitable for components subjected to high loads, repeated stress, and demanding operating conditions.

Steel 4340 responds extremely well to heat treatment, allowing it to achieve very high hardness and strength while maintaining excellent toughness. This makes it especially suitable for heavily loaded components where both durability and resistance to fatigue failure are critical. While its corrosion resistance is limited, protective finishes such as plating, coating, or oiling are typically applied when environmental exposure is expected.

Technical Details

Accuracy

±0.2% (lower limit of ±0.13 mm)

Density

7.85 g/cm³

Min. wall thickness

-

Tensile strength

745 - 860 MPa

Tensile elongation

20 - 25%

Flexural modulus

205000 MPa

Embossing

min. 0.3 mm

Engraving

min. 0.3 mm

Warping risk

N/A

Maximum printing dimensions