Abstract: Hitachi Metals is the world's largest manufacturer of amorphous ribbons and renamed as Proterial in 2023. In this paper, the development of Hitachi metals’ amorphous ribbon was reviewed. The process features of single furnace production and continuous multi-furnaces production were compared. In the process of continuous multi-furnaces production, the realizable continuous casting and coiling can greatly enhance the production efficiency and yield, but require high stability of production equipment and process control. Furthermore the development of new products, new application field and new standards about amorphous ribbons were also introduced. The new production HB1M with high saturation induction and magnetic domain controlled low iron loss Fe-based amorphous alloys “MaDC-A^TM”can effectively reduce the core loss. A recycling plant to handle the amorphous metal cores used in amorphous transformers was established. The recyclings are used as raw materials for amorphous ribbons to achieve low production cost and recycling of products. They also expand in other areas of application such as amorphous motor, amorphous block core for solar power generation and Ni-based amorphous brazing materials.

Key words: Hitachi Metals, Proterial, amorphous ribbons, planar flow casting