METAL SOLUTIONS

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.

MAIN CHARACTERISTICS

  • 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

TYPICAL APPLICATIONS

  • 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 PROPERTIES

Powder Chemical Composition (wt.-%)

Element Min. Max.
Fe Balance
Cr 11.0 13.0
Ni 8.4 10.0
Mo 1.1 1.7
Al 1.2 2.0
Mn 0.0 0.4
Si 0.0 0.4
C 0.0 0.05

Powder Particle Size

GENERIC PARTICLE SIZE DISTRIBUTION 20 - 65 μm

SEM micrograph of EOS StainlessSteel CX powder

HEAT TREATMENT

Description

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

Steps

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.

Process Data Sheet

EOS StainlessSteel CX for EOS M 290 | 30µm

EOS M 290 - 30 µm - TRL 7

Process Information Metal

This process product is optimized for flexible and reliable production of CX parts with emphasis on quality.

System Setup EOS M 290
EOS Material set CX_030_HiPerM291
Recoater Blade Ceramic
Nozzle EOS Grid Nozzle
Inert gas Argon
Sieve 75 µm
Additional Information
Layer Thickness 30 µm
Volume Rate 3.2 mm³/s
Typical Dimensional Change after HT [%] +0.1 %

Microstructure of the Produced Parts

Defects Thickness Result Number of Samples
Average Defect Percentage - 0.03 % -
Density EN ISO 3369 Thickness Result Number of Samples
Average Density - ≥ 7.69 g/cm³ -

Mechanical Properties Heat Treated

EN ISO 6892-1 Room Temperature Yield Strength [MPa] Tensile Strength [MPa] Elongation at Break [%] Reduction of Area Z [%] Number of Samples
Vertical 1670 1730 6 - - -
Horizontal 1650 1720 7.5 - - -

Mechanical Properties As Manufactured

EN ISO 6892-1 Room Temperature Yield Strength [MPa] Tensile Strength [MPa] Elongation at Break [%] Reduction of Area Z [%] Number of Samples
Vertical 770 1050 12 - - -
Horizontal 810 1110 16 - - -

Hardness

EN ISO 6508 Heat Treated
Value 50
Unit HRC
EN ISO 6508 As Manufactured
Value 33
Unit HRC

Fatigue

Heat Treated
Fatigue strength [MPa] 695

Fatigue strength at 1 x 10 million cycles in heat treated state ASTM E466 Fatigue strength determines a stress level where specimen fails at a defined number of stress cycles [ISO 12107]. Fatigue strength was estimated statistically according to ISO 12107. Testing was done according to ASTM E466. Fatigue results typically show large deviations due to the nature of the fatigue process [ISO 12107].

Coefficient of Thermal Expansion

ASTM E228 Temperature
11.1*10-6/K 25 – 100 ºC
11.6*10-6/K 25 – 200 ºC
11.9*10-6/K 25 – 300 ºC
12*10-6/K 25 – 400 ºC
Process Data Sheet

EOS StainlessSteel CX for EOS M 290 | 40/80 µm

EOS M 290 - 40 µm - TRL 3

Process Information Metal

This process product is optimized for flexible and fast production of CX parts with EOS M 290 system. The parameter  set has three different layer thickness options that can all be utilized within the same build: 40µm, 80 µm and 40/80 µm Skin. For high productivity needs a 80 µm parameter set is included with a build rate more than double the long established 40 µm parameter set. Both can be used separately for different parts or combined by using 40/80 µm Skin with faster 80 µm for the core of the part and higher quality 40 µm building for the surface of the part with defined thickness. Sectionioning parts in vertical direction for different parameters is also possible.

System Setup EOS M 290
EOS Material set CX_040_080_Core M291
Required Software Plan EOS BUILD
Recoater Blade Ceramic
Nozzle EOS Grid Nozzle
Inert gas Nitrogen
Sieve 75 µm
Additional Information
Layer Thickness 40/80 µm
Volume Rate 4.1 -7.8 mm³/s
Typical Dimensional Change after HT [%] +0.1 %

Chemical and Physical Properties of Parts

Etched micrograph of powder with 40 µm (left), 80 µm (right)

Microstructure of the Produced Parts

Defects Thickness Result Number of Samples
Average Defect Percentage 40 µm <0.1 % -
Average Defect Percentage 80 µm <0.2 % -

Mechanical Properties

Mechanical Properties Heat Treated

EN ISO 6892-1 Room Temperature Yield Strength [MPa] Tensile Strength [MPa] Elongation at Break [%] Reduction of Area Z [%] Number of Samples
Vertical 1640 1720 6 - - -
Horizontal 1630 1720 7 - - -

Mechanical Properties Heat Treated

EN ISO 6892-1 Room Temperature Yield Strength [MPa] Tensile Strength [MPa] Elongation at Break [%] Reduction of Area Z [%] Number of Samples
Vertical 1600 1680 5.5 - - -
Horizontal 1590 1700 6.5 - - -

Impact Toughness

EN ISO 148-1, Charpy-V Heat Treated
Typical Impact Toughness [J] 14
Layer Thickness 40 µm
Heat Treated
Typical Impact Toughness [J] 10
Layer Thickness 80 µm

Surface Roughness

Process Data Sheet

EOS StainlessSteel CX for EOS M 400-4 | 40/80 µm

EOS M 400-4 - 40 µm - TRL 3

Process Information Metal

This process product is optimized for flexible and fast production of CX parts with EOS M 400-4 system. The parameter  set has three different layer thickness options that can all be utilized within the same build: 40µm, 80 µm and 40/80 µm Skin. For high productivity needs a 80 µm parameter set is included with a build rate more than double the long established 40 µm parameter set. Both can be used separately for different parts or combined by using 40/80 µm Skin with faster 80 µm for the core of the part and higher quality 40 µm building for the surface of the part with defined thickness. Sectionioning parts in vertical direction for different parameters is also possible.

System Setup EOS M 400-4
EOS Material set CX_040_080_Core M404
Required Software Plan EOS BUILD
Software Requirements

EOSPRINT 2.16 or higher
EOSYSTEM 2.17 or newer
Recoater Blade Ceramic
Nozzle Standard
Inert gas Nitrogen
Sieve 75 µm
Additional Information
Layer Thickness 40/80 µm
Volume Rate 4.1 -7.8 per laser mm³/s
Typical Dimensional Change after HT [%] +0.1 %

Chemical and Physical Properties of Parts

Etched micrograph of powder with 40 µm (left), 80 µm (right)

Microstructure of the Produced Parts

Defects Thickness Result Number of Samples
Average Defect Percentage 40 µm <0.1 % -
Density Thickness Result Number of Samples
Average Density 80 µm <0.2 g/cm³ -

Mechanical Properties

Mechanical Properties Heat Treated

EN ISO 6892-1 Room Temperature Yield Strength [MPa] Tensile Strength [MPa] Elongation at Break [%] Reduction of Area Z [%] Number of Samples
Vertical 1650 1720 5.5 - - -
Horizontal 1650 1720 6.5 - - -

Mechanical Properties Heat Treated

EN ISO 6892-1 Room Temperature Yield Strength [MPa] Tensile Strength [MPa] Elongation at Break [%] Reduction of Area Z [%] Number of Samples
Vertical 1600 1690 4.5 - - -
Horizontal 1610 1700 5.5 - - -

Impact Toughness

EN ISO 148-1, Charpy-V Heat Treated
Typical Impact Toughness [J] 14
Layer Thickness 40 µm
Heat Treated
Typical Impact Toughness [J] 10
Layer Thickness 80 µm

Surface Roughness

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