History
| 1940 | Hitachi, Ltd. established Mito Works |
|---|---|
| 1941 | Construction of forging plant |
| 1944 | Completion of 5,000-ton hydraulic forging press |
| 1951 | Development of forged rolls commenced |
| 1953 | Production and sale of forged rolls commenced |
| 1961 | Hitachi, Ltd. established Katsuta Works (operations of Mito Works split between old and new sites) |
| 1970 | Completion of 6,000-ton hydraulic forging press |
| 1987 | Production and sales of composite high-speed-steel rolls commenced |
| 1998 | Completion of 2,000-ton hydraulic forging press |
| April 2004 | Shaped industrial materials business of Hitachi, Ltd. spun off to Hitachi Kyowa Engineering Co., Ltd. |
| April 2013 | Hitachi Kyowa Engineering Co., Ltd., Hitachi Engineering & Services Co., Ltd., Hitachi Setsubi Engineering Co., Ltd., and Hitachi Electric Systems Co., Ltd. merged and renamed Hitachi Power Solutions Co., Ltd. |
| March 2018 | Japan Advanced Roll Co., Ltd. commenced operations, taking over the forged rolls operations spun off from Hitachi Power Solutions Co., Ltd. |
| September 2023 | Formed capital alliance with TOKYO BOEKI MATERIALS LTD., and became a subsidiary of Tokyo Boeki Group |