EOS MaragingSteel MS1 is a steel powder which has been optimized especially for processing on EOSINT M systems.

Parts built in EOS MaragingSteel MS1 have a chemical composition corresponding to US classification 18% Ni Maraging 300, European 1.2709 and German X3NiCoMoTi 18-9-5. This kind of steel is characterized by having very good mechanical properties, and being easily heat- treatable using a simple thermal age-hardening process to obtain excellent hardness and strength.

Parts built from EOS MaragingSteel MS1 are easily machinable after the building process and can be easily post-hardened to more then 50 HRC by age-hardening at 490 °C (914 °F) for 6 hours. In both as-built and age-hardened states the parts can be machined, spark-eroded, welded, micro shot-peened, polished and coated if required. Due to the layerwise building method, the parts have a certain anisotropy, which can be reduced or removed by appropriate heat treatment - see Technical Data for examples.

This document provides information and data for parts built using EOS MaragingSteel MS1 powder (EOS art.-no. 9011-0016) on the following system specifications:

• EOSINT M 270 Installation Mode Standard with PSW 3.3 or 3.4 and default job MS1_020_default.job or MS1_040_default.job

• EOSINT M 270 Dual Mode with PSW 3.5 and EOS Original Parameter Set MS1_Surface 1.0 or MS1_Performance 2.0

• EOSINT M 280 with PSW 3.5 and EOS Original Parameter Set MS1_Performance 1.0 or MS1_Speed 1.0

Typical achievable part accuracy:
small parts ± 20 µm
large parts ± 50 µm