440C Stainless Steel Plate - UNS S44004

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Type 440C is a martensitic stainless steel with high carbon and chromium content.  After heat treatment, it is capable of attaining the highest strength, hardness and wear resistance of all stainless alloys.  Compared to austenitic grades, 440C has moderate corrosion resistance, comparable to 304.  This grade of stainless steel plate can be hardened through heat treatment, but machining is preferable in the annealed condition and becomes extremely difficult once hardened.

Highest resistance can be achieved through hardening and polishing, and the properties of 440C steel make it ideal for knife blades and cutting instruments like surgical blades. This grade, once hardened, hold a sharp edge and resists corrosion, and can be polished to a near mirror finish. Its toughness and ability to resist wear makes 440C stainless steel a good choice for tools like chisels and ball bearings.

440C Inventory Size Ranges


0.1875" - 2.500"

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Standard Inventory Specifications

  • UNS S44004
  • AMS 5630 Chem Only
  • ASTM: A480

Other industry standards we comply with:

  • DFARS Compliant

Common Trade Names

  • 440C Surgical Steel Plate

Common Applications of 440C

  • Cutting Instruments
  • Knife Blades
  • Surgical Instruments
  • Chisels
  • Measuring instruments
  • Ball Bearings and Valves


  • Hardenable chromium steel
  • High strength
  • High wear resistance
Chemical Properties of 440C Stainless Steel
Element Percent by Weight
C Carbon 1.20%
Cr Chromium 18%
Mn Manganese 1%
Mo Molybdenum 0.75
P Phosphorous 0.04
Si Silicon 1%
S Sulfur 0.030%

Physical Properties of 440C Stainless Steel



Density kg/mᶟ


Thermal Conductivity at 212°F (100°C)


Thermal Conductivity at 932°F (500°C)


Electrical Resistivity


Elastic Modulus (Gpa)


Mechanical Properties


Yield Strength 0.2% Proof (Mpa)


Tensile Strength (Mpa)


Elongation (% in 50mm)


Hardness (HB)

269 max



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The technical data provided is for information only and not for design purposes. It is not warranted or guaranteed.