Metallurgists
Concept · Stellaris 4.5.2
Metallurgists in the Stellaris encyclopedia: Metallurgists turn Minerals into Alloys.
Metallurgists in the game's words
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Metallurgists turn 
Minerals into Alloys.
Highly trained workers are needed to turn raw minerals into the durable alloys that are used in a wide variety of advanced construction.
Entries that mention Metallurgists
Source: common/game_concepts (concept_foundry) and localisation/english, Stellaris Cygnus v4.5.2 (9776).