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440F Stainless Steel | Stainless Steel Supply

440F stainless steel is a type of martensitic stainless steel that boasts high carbon and chromium content, resulting in exceptional strength, hardness, and resistance to wear, corrosion, and high temperatures. Due to its outstanding properties, it is a favored material for creating parts that require robust hardness and corrosion resistance, such as valves, bearings, and blades. Furthermore, this stainless steel is straightforward to machine, making it a popular choice in the manufacturing industry. With a maximum hardness of approximately 60 HRC, 440F stainless steel is considered an exceptionally hard material.

Chemical composition


Note: These values are approximate

Mechanical properties

Tensile strengthYield strengthElongationHardness
1170-1310  MPa1050-1180 MPa10-20%57-60 HRC

Note: These values are approximate

Physical properties

Density7.7 g/cm³
Coefficient of thermal expansion10.4 x 10^-6 /K (20-100°C)
Thermal conductivity24 W/(m·K) (100°C)
Specific heat capacity460 J/(kg·K) (0-100°C)
Electrical resistivity0.60 x 10^-6 Ω·m
Magnetic propertiesHigh magnetic permeability,

Note: These values are approximate

As a premium supplier of stainless steel, we offer a wide range of grades, sizes and finishes to suit your needs.
Size: according to customer requirements
Standards: GB, ASTM, EN, JIS, etc.
Austenitic type
Ferritic type
Martensitic type

Looking forward to your inquiry!