| 1958 | Tokyo Heat Treatment Co., Ltd. established. Yokohama plant commenced operations. Yokohama factory commenced operations. |
|---|---|
| 1968 | Nagoya factory commenced operations. |
| 1973 | Moka plant commenced operations. |
| 1981 | Shiga plant commenced operations. |
| 1985 | Licensing of technology to HIGHTEMP FURNACES, LTD. (INDIA) |
| 1987 | Toyota plant commenced operations. Hamamatsu plant (former Tenryu Netsushori Kogyo Co., Ltd.) commenced operations. |
| 1990 | Chukyo Handa plant commenced operations. |
| 1991 | Merged with DOWA MINING CO., LTD. DOWA Thermotech business operational headquarters established. |
| 1997 | DOWA THT AMERICA, INC. established. |
| 2006 | Holding company system implemented. (DOWA MINING CO., LTD. changed its name to DOWA Holdings Co., Ltd.) CEMM Co., Ltd. joined Dowa Group. |
| 2008 | DOWA THERMOTECH (THAILAND) CO., LTD. established Ota plant commenced operations Headquarters relocated to Nagoya-shi, Aichi. |
| 2010 | Kunshan Dowa Thermo Furnace Co., Ltd. established. |
| 2011 | Development center established in Nagoya headquarters. Acquired a controlling interest of HIGHTEMP FURNACES, LTD. (INDIA) |
| 2012 | PT. DOWA THERMOTECH INDONESIA established. PT. DOWA THERMOTECH FURNACES established. |
| 2015 | Hamamatsu-kita plant commenced operations. DOWA THERMOTECH MEXICO, S.A. de C.V. established. |
| 2016 | New construction of heat treatment processing plant in Hamamatsu-kita plant. |
| 2017 | Research and development center established in Hamamatsu-kita plant. |