EOS MaragingSteel MS1

Material Data Sheet | Powder Product No. 9011-0016, 9030-0024

EOS MaragingSteel MS1 is an ultra high strength tooling grade maraging steel.
Its excellent properties are enabled by forming intermetallic phases and precipitates in heat treatment. It's nickel, cobalt, molybdenum and titanium alloying results in an excellent material for additive manufacturing and provide low distortion and balanced properties. The properties enable successful use in diverse applications including injection molding and cold and hot working.

MAIN CHARACTERISTICS

Ultra high strength and hardness
Properties adjustable with different heat treatment
Low distortions
Good machinability

TYPICAL APPLICATIONS

Injection molding tools & inserts
Mechanical engineering parts

The EOS Quality Triangle

Material Data Sheet | Powder Product No. 9011-0016, 9030-0024

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

Chemical composition of EOS MaragingSteel MS1 corresponds to AMS6514 18Ni300 maraging steel standard.

Powder Chemical Composition (wt.-%)

Element	Min.	Max.
Ni	17	19
Co	8.5	9.5
Mo	4.5	5.2
Ti	0.6	0.8
Al	0.05	0.15
Cr	0	0.5
Cu	0	0.5
C	0	0.03
Mn	0	0.1
Si	0	0.1
P	0	0.01
S	0	0.01

Powder Particle Size

Generic Particle Size Distribution

15 - 65 µm

HEAT TREATMENT

Description

EOS MaragingSteel 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 hardening takes place through forming of intermetallic phases and precipitates

Steps

Solution annealing: 2 h at 940 °C (±10 °C) measured from the part followed by rapid air cooling to room temperature (below 32 °C). Cooling rate 5-60 °C/min. Reaching room temperature before starting aging treatment is required to achieve desired microstructure.

Aging: For peak hardness of 54 HRC age 6 h at 490 °C (±10 °C) measured from the part followed by air cooling. Mechanical properties presented in this document achieved through this aging procedure. For lower hardness and strength choose aging temperature according to the graph below

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