Michizo Amano establishes Amano Shoten, a limited partnership, in Maruta-cho, Naka-ku, Nagoya,
to sell specialty steel and wire rod products.

Becomes an authorized distributor for Nisshin Steel Co., Ltd. (now Nippon Steel Corporation).

Reorganizes Amano Shoten into Amano Steel Co., Ltd. with a capital of 5 million yen.

Relocates to Chiyoda 4-chome, Naka-ku, Nagoya, upon completion of a new company building.

Increases capital to 50 million yen.

Increases capital to 60 million yen.

Receives capital investment from Nisshin Steel Co., Ltd. (now Nippon Steel Corporation).

Completes construction of a service center in Kasugai City, Aichi Prefecture.

Enters into a business alliance with Toyota Tsusho Corporation.

Increases capital to 100 million yen.

Completes construction of the Steel Center in Odaka-cho, Midori-ku, Nagoya. Closes the service center and completes the relocation.

Receives capital investment from Toyota Tsusho Corporation.

Completes construction of the new head office building. Relocates the head office from Naka-ku, Nagoya, to its current location, completing the integration of the head office and factory.

Opens the Hamamatsu Sales Office.

Installs a wide slitter line.

Receives capital investment from Mitsubishi Corporation (now Metal One Corporation).

Changes the company name to PROSTEEL Co., Ltd.

Installs Slitter Line No. 3.

Constructs the V Yard warehouse.

Installs a gamma-ray thickness gauge on the wide slitter line.

Constructs the I Yard warehouse.

Establishes TT PROSTEEL (THAILAND) CO., LTD.

Obtains ISO 9001:2015 quality management system certification.

Obtains ISO 14001:2015 environmental management system certification.

Certified as a Health & Productivity Management Outstanding Organization.

Transfers the business of TT PROSTEEL (THAILAND) CO., LTD. to TT Automotive Steel (THAILAND) CO., LTD.

Metal One Corporation transfers all its shares to Toyota Tsusho Corporation.

Nippon Steel Corporation transfers all its shares to Toyota Tsusho Corporation, making PROSTEEL a wholly owned subsidiary of Toyota Tsusho Corporation.

Increases capital to 310 million yen.