METAL SOLUTIONS

EOS StainlessSteel SuperDuplex

Material Data Sheet

EOS StainlessSteel SuperDuplex

EOS StainlessSteel SuperDuplex is an austenitic-ferritic duplex stainless steel for extreme conditions. The high chromium, molybdenum and nitrogen alloying give excellent corrosion resistance in many difficult environments. The product is optimized for additive manufacturing while maintaining SuperDuplex properties. The optimization of phase balance enables use of the product in as manufactured condition in many use cases. The general pitting resistance equivalent PREN for EOS SuperDuplex is 41 (PREN = %Cr + 3.3 X %Mo + 16 X %N)

MAIN CHARACTERISTICS

  • Excellent resistance to uniform, pitting and crevice corrosion
  • High strength together with high corrosion resistance

Download Process Data Sheet (PDF)

TYPICAL APPLICATIONS

  • Oil and gas industry
  • Pulp and paper manufacturing devices
  • Mining and off-shore equipment

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 22.0 26.0
Ni 9.0 13.0
Mo 3.0 6.0
N 0.15 0.35
C 0.0 0.03

Powder Particle Size

GENERIC PARTICLE SIZE DISTRIBUTION 20 - 65 μm

SEM micrograph of EOS StainlessSteel SuperDuplex powder

HEAT TREATMENT

Description

Heat treatment optional. 

Steps

Solution annealing:

Hold temperature 1100 °C, hold time 0.5 h when thoroughly heated, water quenching

Typical dimensional change after heat treatment -0.4 % (40 µm) or -0.8 % (80 µm)

Process Data Sheet

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

EOS M 290 - 40 µm - TRL 3

System Setup EOS M 290
EOS Material set SuperDuplex_040_080_CoreM291_100
Software Requirements

EOSPRINT 2.9 or newer

EOSYSTEM 2.12 or newer
Recoater Blade Ceramic
Nozzle EOS Grid Nozzle
Inert gas Argon
Sieve 75 µm µm
Additional Information
Layer Thickness 40/80 µm
Volume Rate 4.1-7.9 mm³/s

Chemical and Physical Properties of Parts

Chemical composition of built parts is compliant to EOS StainlessSteel SuperDuplex powder chemical composition.

Micrograph etched, heat treated state. Etchant: Aqua regia

Microstructure of the Produced Parts

Defects Thickness Result Number of Samples
Average Defect Percentage 40 µm 0.04 % -
Average Defect Percentage 80 µm 0.08 % -
Density EN ISO 3369 Thickness Result Number of Samples
Average Density 40 µm ≥ 7.80 g/cm³ -
Density EN ISO 3369 Thickness Result Number of Samples
Average Density 80 µm ≥ 7.80 g/cm³ -

Mechanical Properties

Mechanical Properties As Manufactured

EN ISO 6892-1 Room Temperature Yield Strength [MPa] Tensile Strength [MPa] Elongation at Break A [%] Reduction of Area Z [%] Number of Samples
Vertical 1020 1180 16 - 200 -
Horizontal 1170 1260 13 - 200 -

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 560 860 34 - 200 -
Horizontal 580 870 34 - 200 -

Mechanical Properties As Manufactured

EN ISO 6892-1 Room Temperature Yield Strength [MPa] Tensile Strength [MPa] Elongation at Break A [%] Reduction of Area Z [%] Number of Samples
Vertical 880 1050 20 - 200 -
Horizontal 1030 1130 17 - 200 -

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 560 860 35 - 200 -
Horizontal 570 870 33 - 200 -

Modulus of elasticity testing according to EN ISO 6892-1 Method A, Range 1 (0.00007 1/s).

Solution annealing 
Hold temperature 1 100 °C, hold time 0.5 h when thoroughly heated, water quenching.
Typical dimensional change after heat treatment -0.4 % (40 µm) or -0.8 % (80 µm).

Impact Toughness

EN ISO 148-1, Charpy-V As Manufactured
Typical Impact Toughness [J] 110
Layer Thickness 40 µm
EN ISO 148-1, Charpy-V Heat Treated
Typical Impact Toughness [J] 155
Layer Thickness 40 µm
EN ISO 148-1, Charpy-V As Manufactured
Typical Impact Toughness [J] 70
Layer Thickness 80 µm
EN ISO 148-1, Charpy-V Heat Treated
Typical Impact Toughness [J] 140
Layer Thickness 80 µm

Surface Roughness

Coefficient of Thermal Expansion

As Manufactured Temperature
10.42*10-6/K 25 – 100 ºC
11.12*10-6/K 25 – 200 ºC
11.51*10-6/K 25 – 300 ºC
Heat Treated Temperature
13.63*10-6/K 25 – 100 ºC
14.81*10-6/K 25 – 200 ºC
15.32*10-6/K 25 – 300 ºC
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