High Carbon Martensitic Stainless Steels

High Carbon 440 Stainless Steel Grades Stocked:



Rounds: 3mm dia. to 520mm dia

Rectangular: 50.8mm x 12.7mm to 240mm x 75mm


  • Good strength
  • Good wear resistance
  • Will obtain and hold excellent hardness (Rc 50 to 60)
  • Moderate corrosion resistance
  • Thermal conductivity

These high carbon steels attain high hardness, wear resistance and strength after heat treatment.  They are considered to be slightly cold workable by common practices and do respond well to heat treatment. Grade 440 stainless steels can be easily machined in their annealed state. Machining these grades after hardening is extremely difficult, or impossible in some cases.


Engineering and wear resistant applications, valve components, ball bearings, chisels, surgical equipment, high quality knife blades.

The metallurgy of these steels can be complex and if you need any help concerning usage, heat treatment etc, please do consult our in-house metallurgist for advice specific to your needs.

William Innes Bill@birdstst.com, 01226 766766