Process Data Sheet

EOS CaseHardeningSteel 20MnCr5 for EOS M 290 | 40/80 µm

EOS M 290 - 40/80 µm - TRL 3

System Setup EOS M 290
EOS Material set 20MnCr5_040_080_CoreM291
Software Requirements

EOSPRINT 2.13 or newer
EOSYSTEM 2.17 or newer
Recoater Blade Ceramic
Nozzle EOS Grid Nozzle
Inert gas Nitrogen
Sieve 75 µm
Additional Information
Layer Thickness 40 µm, 80 µm, 40/80 µm
Volume Rate 4.1 - 7.9 mm³/s

Chemical and Physical Properties of Parts

Micrograph of polished surface
Etched microstructure image. Heat treated state.

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 | 40 µm | Yield Strength [MPa] Tensile Strength [MPa] Elongation at Break A [%] Reduction of Area Z [%] Modulus of elasticity [GPa] Number of Samples
Vertical 1310 1510 9 - - -
Horizontal 1320 1510 9 - - -

Step 1 Hardening: 
840 - 870 °C, hold time 30 min when thoroughly heated, water or oil quenching

Step 2 Tempering: 
160 - 200 °C, hold time 2 h when thoroughly heated, air cooling

Mechanical Properties Heat Treated

EN ISO 6892-1 Room Temperature | 80 µm | Yield Strength [MPa] Tensile Strength [MPa] Elongation at Break A [%] Reduction of Area Z [%] Modulus of elasticity [GPa] Number of Samples
Vertical 1280 1490 9 - - -
Horizontal 1270 1490 9 - - -

Impact Toughness

EN ISO 148-1, Charpy-V As Manufactured
Typical Impact Toughness [J] 30
Layer Thickness 40 µm
EN ISO 148-1, Charpy-V As Manufactured
Typical Impact Toughness [J] 30
Layer Thickness 80 µm

Surface Roughness

Coefficient of Thermal Expansion

ASTM E228 Temperature
12.8*10-6/K 25 – 100 ºC
13.7*10-6/K 25 – 200 ºC
15.1*10-6/K 25 – 300 ºC
15.1*10-6/K 25 – 400 ºC
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