440 Stainless Steel Supply

440 Stainless Steel Properties

Corrosion Resistance: 440 stainless steel is known for its excellent corrosion resistance in mild environments. It is resistant to corrosion from chemicals, solvents, and salts.

Wear Resistance: 440 stainless steel is known for its excellent wear resistance, making it a popular choice for applications that require high levels of wear resistance such as knives, bearings, and cutting tools.

Hardness: 440 stainless steel is a high-hardness material that can be heat-treated to achieve a hardness of up to 58 HRC. This property makes it suitable for applications that require high levels of hardness, such as cutting tools and industrial blades.

Weldability: 440 stainless steel is known for its poor weldability due to its high carbon content. It is not recommended for welding applications.

Magnetic Properties: 440 stainless steel is magnetic in all conditions.

Heat Resistance: 440 stainless steel has good heat resistance up to 260°C (500°F). It can be used in high-temperature applications such as furnace parts, heat exchangers, and exhaust systems.

Compostion

GradeCMnSiPSCrMoNiN
440Cmin.
max.
0.95
1.20
-
1
-
1
-
0.04
-
0.030
16.00
18.00
-
0.75
--

Mechanical Properties

Tempering Temperature (°C)Tensile Strength (MPa)Yield Strength 0.2% Proof (MPa)Elongation (% in 50mm)Hardness Rockwell (HR C)Impact Charpy V (J)
Annealed*75844814269HB max#-
204203019004599
260196018304579
316186017404569
371179016604569
* Annealed properties are typical for Condition A of ASTM A276# Brinell Hardness is ASTM A276 specified maximum for annealed 440A, B and C.

Physical Properties

GradeDensity (kg/m3)Elastic Modulus (GPa)Mean Coefficient of Thermal Expansion (mm/m/°C)Thermal Conductivity(W/m.K)Specific Heat
0-100°C (J/kg.K)Electrical Resistivity (nW.m)
0-100°C0-200°C0-600°Cat 100°Cat 500°C
440 C765020010.110.311.724.2-460600

440 Stainless Steel Applications

440 stainless steel is a group of martensitic stainless steels known for their high carbon content, good corrosion resistance, and high hardness. Within the 440 stainless steel family, there are several grades, such as 440A, 440B, and 440C, each with slightly different properties. Here are some common applications for 440 stainless steel:

  1. Cutlery and Knife Blades: One of the primary applications of 440 stainless steel is in the manufacturing of knives and blades. Its high hardness and corrosion resistance make it suitable for producing durable and sharp cutting edges.
  2. Ball Bearings: Components in ball bearings, such as races and balls, may be made from 440 stainless steel due to its hardness and wear resistance. It helps extend the life of bearings in various applications.
  3. Surgical Instruments: Some surgical instruments, including scalpels and dental tools, are made from 440 stainless steel due to its sharpness, corrosion resistance, and ease of sterilization.
  4. Tool and Die Manufacturing: 440 stainless steel is used in the production of various tools and dies, including punches, chisels, and cutting tools, where hardness and wear resistance are crucial.
  5. Industrial Blades: Blades used in industrial settings, such as cutting paper, plastic, or other materials, can be made from 440 stainless steel for its sharpness and durability.
  6. Valve Components: Parts of valves, especially those requiring hardness and corrosion resistance, may be manufactured using 440 stainless steel.
  7. Bearings and Races: Beyond ball bearings, 440 stainless steel is used in various bearing applications, where high hardness and corrosion resistance are essential.
  8. Firearms Components: Some firearm components, such as certain parts of gun barrels, are made from 440 stainless steel due to its hardness and resistance to corrosion.
  9. Aerospace Components: In certain aerospace applications, 440 stainless steel may be used for components where a combination of hardness and corrosion resistance is required.
  10. Sporting Goods: Components in sporting goods like fishing knives, pocket knives, and certain types of scissors may be made from 440 stainless steel for its sharpness and durability.

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