METAL SOLUTIONS

EOS CaseHardeningSteel 20MnCr5

Material Data Sheet

EOS CaseHardeningSteel 20MnCr5

Case hardening steel with good hardenability reaching good wear resistance due to high surface hardness after heat treatment.

MAIN CHARACTERISTICS

  • Good wear resistance
  • Excellent surface hardness after carburizing
  • Material according to EN-10084 alloy number 1.7147
  • Carburizable to achieve surface hardness of 60 HRC

Download Process Data Sheet (PDF)

TYPICAL APPLICATIONS

  • Automotive and general engineering applications 
  • Gears, mechanical parts

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

EOS CaseHardeningSteel 20MnCr5 powder material is in accordance with EN-10084 alloy number 1.7147.

Powder Chemical Composition (wt.-%)

Element Min. Max.
Fe Balance
Mn 1.1 1.4
Cr 1.0 1.3
C 0.17 0.22
Si 0.0 0.4
S 0.0 0.035

Powder Particle Size

GENERIC PARTICLE SIZE DISTRIBUTION 15 - 55 μm

HEAT TREATMENT

Steps

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

Optional softening treatment:
Normalizing 870 °C, hold time 1 h when thoroughly heated, air cooling

Optional carburizing in carbon rich atmosphere:
Carburizing treatment 860-900 °C, cooling in air. Hardening and tempering to be performed after carburizing.

Process Data Sheet

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

EOS M 290 - 40 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 40/80 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 Yield Strength [MPa] Tensile Strength [MPa] Elongation at Break A [%] Reduction of Area Z [%] 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 Yield Strength [MPa] Tensile Strength [MPa] Elongation at Break A [%] Reduction of Area Z [%] 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
Process Data Sheet

EOS CaseHardeningSteel 20MnCr5 for EOS M 400-4 | 40/80 µm

EOS M 400-4 - 40 µm - TRL 3

System Setup EOS M 400-4
EOS Material set 20MnCr5_040_080_CoreM404
Software Requirements

EOSPRINT 2.13 or newer
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 - 7.9 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 Yield Strength [MPa] Tensile Strength [MPa] Elongation at Break A [%] Reduction of Area Z [%] Number of Samples
Vertical 1310 1510 8 - - -
Horizontal 1300 1500 8 - - -

Mechanical Properties Heat Treated

EN ISO 6892-1 Room Temperature Yield Strength [MPa] Tensile Strength [MPa] Elongation at Break A [%] Reduction of Area Z [%] Number of Samples
Vertical 1270 1490 8 - - -
Horizontal 1270 1490 8 - - -

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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