EOS StainlessSteel CX

Material Data Sheet

EOS StainlessSteel CX

Combines Corrosion Resistance with High Strength and Hardness

EOS StainlessSteel CX is a tooling grade steel characterized by having a good corrosion resistance combined with high strength and hardness. Parts built from EOS StainlessSteel CX can be machined, shot-peened and polished in as manufactured or heat treated state.


  • Stainless steel with excellent corrosion resistance combined with high strength and hardness
  • The parts are easily machinable and offer excellent polishability
  • The parts offer excellent wear and fatigue resistance


  • Plastic injection molding tools and tool parts for demanding applications
  • Rubber molding tools and tool parts
  • Molding tools and tool parts for corrosive plastics
  • Other industrial applications where high strength and hardness are required

The EOS Quality Triangle

EOS uses an approach that is unique in the AM industry, taking each of the three central technical elements of the production process into account: the system, the material and the process. The data resulting from each combination is assigned a Technology Readiness Level (TRL) which makes the expected performance and production capability of the solution transparent.

EOS incorporates these TRLs into the following two categories:
  • Premium products (TRL 7-9): offer highly validated data, proven capability and reproducible part properties. 
  • Core products (TRL 3 and 5): enable early customer access to newest technology still under development and are therefore less mature with less data.

All of the data stated in this material data sheet is produced according to EOS Quality Management System and international standards
EOS 3D Printing Solutions Quality Triangle


Powder Chemical Composition (wt.-%)

Element Min. Max.
Fe Balance
Cr 11 13
Ni 8.4 10
Mo 1.1 1.7
Al 1.2 2
Mn - 0.4
Si - 0.4
C - 0.05

Powder Particle Size


SEM micrograph of EOS StainlessSteel CX powder



EOS StainlessSteel CX can be heat treated to match various needs of different applications. The two step heat treatment can be performed under vacuum or inert gas atmosphere. First step is solution annealing to minimize amount of austenite in the martensitic matrix. The needed hardness and strength is achieved through aging treatment where preci - pitation hardening takes place


Solution Annealing: 30 minutes at 850 °C (±10 °C) measured from the part followed by rapid air cooling to room temperature (below 32 °C). Cooling rate 20-60 °C/min. Reaching room temperature before starting aging treatment is required to achieve desired microstructure.

Aging: For peak hardness and strength 2 h at 525 °C (±10 °C) measured from the part followed by air cooling. Mechanical properties presented in this document achieved through this aging procedure.

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