Status as of 25.11.2025

METAL SOLUTIONS

EOS StainlessSteel 17-4PH

Material Data Sheet

Precipitation hardening steels are widely used in engineering applications, which require corrosion resistance and strength. Parts built from EOS StainlessSteel 17-4PH can be machined, shot-peened and polished in as-built or heat treated states. Solution annealing together with ageing treatment are necessary in order to achieve proper hardness and mechanical properties (ASTM A564 – 13). Due to the layerwise building method, the parts have a certain anisotropy which can be eased by solution annealing.

MAIN CHARACTERISTICS

Corrosion resistance and strength
Parts can be machined, shot-peened and polished in asbuilt or heat treated states
Solution annealing together with aging treatment are necessary in order to achieve proper hardness and mechanical properties (ASTM A564-13)
Chemical composition and part properties corresponding to 1.4542, UNS 17400 and ASTM A564M

TYPICAL APPLICATIONS

Acid and corrosion resistant engineering parts
Medical instruments (surgical tools, orthopedic instrumentation)

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

POWDER PROPERTIES

The chemical composition of parts is in compliance with standards “F899 – 12b Standard Specification for Wrought Stainless Steels for Surgical Instruments” and “A564M – 13 Standard Specification for Hot-Rolled and Cold-Finished AgeHardening Stainless Steel Bars and Shapes”. Composition complies the material composition in “powder properties” section. Part accuracy is adjustable by changing the “Beam Offset, X-, Y- and Z-Shrinkage”-parameters.

Powder Chemical Composition (wt.-%)

Element	Min.	Max.
Cr	15.0	17.5
Ni	3.0	5.0
Cu	3.0	5.0
Si	0.0	1.0
Mn	0.0	1.0
C	0.0	0.07
P	0.0	0.04
S	0.0	0.03
Nb + Ta	0.15	0.45

Powder Particle Size

GENERIC PARTICLE SIZE DISTRIBUTION	15 - 65 μm

HEAT TREATMENT

Description

Vacuum H900 & Atmospheric HT procedures

Steps

Vacuum H900 heat treatment procedure

Solution annealing: Hold at 1040°C (1904°F) ±15°C (± 59°F) for 30 minutes, air cooling under 32°C (89°F).

Ageing: Hold at 480°C (896°F) for one hour, air cooling under 32°C (89°F).

Atmospheric HT procedure (preferred atmosphere: Argon)

Solution annealing: Hold at 1040°C (1904°F) ±15°C (± 59°F) for 30 minutes, air cooling under 32°C (89°F).

Ageing: Hold at 460°C (860°F) for one hour, air cooling under 32°C (89°F).

Process Data Sheet

EOS StainlessSteel 17-4PH 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 17-4PH 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	17-4PH_040_080_Core M291
Required Software Plan	EOS BUILD
Software Requirements	EOSPRINT 2.14 or newer EOSYSTEM 2.18 or newer
Recoater Blade	Ceramic
Nozzle	EOS Grid Nozzle
Inert gas	Argon
Sieve	75 µm

Additional Information
Layer Thickness	40/80 µm
Volume Rate	4.1-7.9 mm³/s
Typical Dimensional Change after HT [%]	+0.2 %

Chemical and Physical Properties of Parts

Etched micrograph of powder

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	1240	1360	14	-	-	-
Horizontal	1240	1360	14	-	-	-

H900 Heat treatment

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	1240	1360	13	-	-	-
Horizontal	1230	1355	14	-	-	-

H900 Heat treatment

Impact Toughness

EN ISO 148-1, Charpy-V Heat Treated
Typical Impact Toughness [J]	20
Layer Thickness	40 µm

H900 Heat treatment

Heat Treated
Typical Impact Toughness [J]	20
Layer Thickness	80 µm

H900 Heat treatment

Surface Roughness

Surface roughness of powder

Process Data Sheet