6K Additive CEO details circularity model with Siemens Energy, 20 tons of nickel superalloy powder processed

6K Additive has formalized a long-term supply agreement with Siemens Energy that transforms spent nickel alloy powder from Siemens’ own AM operations into premium, AM-ready feedstock. Under the deal, Siemens Energy supplies revert material — powder that would otherwise enter lower-value recycling streams — to 6K Additive, which reprocesses it through its proprietary UniMelt microwave plasma system. The company reports that nearly 20 tons of nickel superalloy powder from Siemens Energy have already been processed and returned to the AM market. CEO Frank O’Brien framed the arrangement as the industrial-scale version of circularity that moves beyond paper commitments.

This partnership directly addresses a structural inefficiency in metal AM: the high cost and environmental burden of virgin powder production. 6K Additive’s UniMelt process has demonstrated a 91% energy reduction and 92% carbon emission reduction for nickel-based alloys versus conventional atomization, per its life cycle assessments. The deal also reflects a recurring pattern in the industry — the aerospace qualification grind — where material provenance and supply chain security matter as much as performance. Siemens Energy, a major AM user in gas turbine repair and production, gains a closed-loop solution that reduces its powder procurement costs and waste liability. For 6K Additive, the agreement provides a predictable feedstock stream and validates its circularity model at a scale that few competitors in the metal powder recycling space can match.

For the broader metal AM market, this deal demonstrates that circularity is not a marketing angle but a procurement strategy that can lower input costs for high-value nickel superalloys. The practical next step for 6K Additive is to replicate this model with other large AM users in energy and aerospace, where powder waste volumes are significant. Buyers evaluating powder suppliers should weigh feedstock provenance and reprocessing capability alongside traditional metrics like particle size distribution and flowability.