About

CNC machined Stainless Steel 440C is a high-carbon martensitic stainless steel designed for applications requiring exceptional hardness, strength, and wear resistance. The material can be heat treated to achieve very high hardness levels, making it one of the hardest stainless steels commonly used in precision engineering and mechanical components.

Stainless Steel 440C offers excellent resistance to wear, abrasion, and deformation under load, while also providing moderate corrosion resistance in mild environments. Compared to austenitic grades such as 304 or 18-8, it provides significantly higher hardness and edge retention but lower corrosion resistance and reduced toughness. The material is typically machined in a softer condition and then heat treated to maximize hardness and performance.

Typical applications include bearings, cutting tools, valve components, molds, surgical instruments, and high-precision wear-resistant parts where durability, dimensional stability, and long service life are critical.

Technical Details

Accuracy

±0.2% (lower limit of ±0.13 mm)

Density

7.75 g/cm³

Min. wall thickness

-

Tensile strength

700 - 1900 MPa

Tensile elongation

10 - 20%

Flexural strength

200000 MPa

Embossing

min. 0.3 mm

Engraving

min. 0.3 mm

Warping risk

N/A

Maximum printing dimensions