Proterial (株式会社プロテリアル, formerly known as Hitachi Metals) is a company that manufactures steel, rolls, magnetic materials, power electronics, wires, and automotive parts. Its products include tool steels, materials for industrial machinery, aircraft and energy applications, electronic materials, metal powders for 3D printing, ceramics, electrical wires, and medical components. The company serves clients in the automotive, industrial infrastructure, electronics, medical, and energy sectors.