EOS CobaltChrome MP1 is a cobalt-chrome-molybdenum-based superalloy powder which has been optimized especially for processing on EOSINT M systems.

Parts built from EOS CobaltChrome MP1 conform to the chemical composition UNS R31538 of high carbon CoCrMo alloy. They are nickel-free (< 0.1 % nickel content) and are characterized by a fine, uniform crystal grain structure. As built EOS CobaltChrome MP1 meets the chemical and mechanical specifications of ISO 5832-4 and ASTM F75 for cast CoCrMo implant alloys, as well as the specifications of ISO 5832-12 and ASTM F1537 for wrought CoCrMo implants alloys except remaining elongation. The remaining elongation can be increased to fulfil even these standards by high temperature stress relieving or hot isostatic pressing (HIP).

Parts made from EOS CobaltChrome MP1 can be machined, spark-eroded, welded, micro shot- peened, polished and coated if required. They are suitable for biomedical applications (note: subject to fulfilment of statutory validation requirements where appropriate), and for parts requiring high mechanical properties in elevated temperatures (500 - 1000 °C) and with good corrosion resistance. 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 CobaltChrome MP1 pow- der (EOS art.-no. 9011-0012) on the following system specifications:

• EOSINT M 270 Installation Mode Standard with PSW 3.3 or 3.4 and default job CC20_MP1_020_default.job or CC20_MP1_040_default.job

• EOSINT M 270 Dual-Mode with PSW 3.5 and EOS Original Parameter Set MP1_Surface 1.0 or MP1_Performance 1.0

• EOSINT M 280 with PSW 3.5 and EOS Original Parameter Set MP1_Surface 1.0, MP1_Performance 1.0 or MP1_Speed 1.0

Typical achievable part accuracy:
small parts ± 20-50 µm
large parts ± 50-200 µm