50 grades of stainless steel
BSSA

The BSSA has selected 50 Grades of Stainless Steel as its theme for 2014. Each week throughout the year, we will showcase one grade and illustrate the variety of corrosion resistant, mechanical and physical properties which determine its suitability for a wide range of applications.

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440A/440B/440C 1.4109/1.4112/1.4125 S44002/S44003/S44004  

Bearings

Bearings

Knife Blade

Knife Blade

The 440 grades form a series of high carbon martensitic stainless steels. They have basic corrosion resistance and extremely high hardness and wear resistance.

Approximate Composition – 16% Cr, 0.60-1.0% C plus Mo and V in EN grades (Exact composition ranges vary between EN and ASTM standards. Equivalents much looser than for most grades).

This grade combines the following characteristics:

  • Basic corrosion resistance. Lower than other martensitic grades like 431
  • Very high hardness increasing with carbon content. 440C capable of 60 Rockwell HRC (~700 HV)
  • Very high strength up to 2000 MPa UTS, 1900 MPa 0.2% PS
  • Low elongation 4%
  • Low toughness 10J
  • Very high wear resistance
  • Difficult to weld
  • Difficult to machine

This series of grades give the highest level of strength/hardness in any martensitic stainless steel. Consequently, they are used where a basic level of corrosion resistance is required coupled with high wear resistance or blade sharpness. They are usually supplied in the annealed condition for improved machinability and then hardened and tempered to develop the high hardness.

Applications which illustrate these features include:

Bearings, valves, knife blades, surgical instruments, tools, moulds, dies.

Find out more about the 50 Grades of Stainless Steel campaign
 

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British Stainless Steel Association (BSSA): registered in England and Wales as a private company limited by guarantee; registration no. 07547349

 

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