| 1937年12月 |
Osaka Iron & Steel Co.,Ltd. established. |
| 1938年12月 |
Merged with Yodogawa Cast Steel Co.,Ltd. |
| 1947年08月 |
Constructed new small section mill in Amagasaki Works to commence production of wire rods. |
| 1951年06月 |
Constructed new small section mill in Kyobashi Works to commence production of wire rods and steel bars. |
| 1955年04月 |
Constructed new medium section mill in Kyobashi Works to commence production of shape steel. |
| 1957年01月 |
Listed stock on Osaka Stock Exchange. |
| 1960年04月 |
Constructed No. 1 blast furnace in Nishijima Works, located in Nishi-yodogawa-ku, Osaka. |
| 1961年10月 |
Listed stock on Tokyo and Nagoya Stock Exchanges. |
| 1964年11月 |
Constructed two new converters in Nishijima Works. |
| 1968年11月 |
Moved head office to Umeda-cho 8, Kita-ku, Osaka (Nishi-hanshin Building). |
| 1969年08月 |
Constructed No. 2 blast furnace in Nishijima Works. No. 1 blast furnace ceased operation. |
| 1972年08月 |
Constructed No.1 continuous casting machine in Nishijima Works. |
| 1977年06月 |
Merged with Otani Jukogyo Co.,Ltd.; changed company name to Godo Steel, Ltd.; Steel producing bases were organized into three: Osaka, Tokyo and Amagasaki Works. |
| 1978年04月 |
Merged with Japan Iron‐Sand Steel Co.,Ltd. and Koto Seiko Co.,Ltd. to establish Himeji Works as the fourth steel producing base. |
| 1980年03月 |
Closed Amagasaki Works. |
| 1982年02月 |
Constructed No. 2 continuous casting machine in Osaka Works. |
| 1982年04月 |
Replaced wire rod rolling mill in Osaka Works with new mill. |
| 1984年03月 |
Closed Tokyo Works. |
| 1984年12月 |
Constructed new 70 ton electric furnace in Osaka Works. |
| 1984年12月 |
Constructed No. 3 continuous casting machine in Osaka Works. |
| 1991年04月 |
Merged with Funabashi Seiko Co.,Ltd. to integrate steel production bases into three: Osaka, Himeji and Funabashi Works. |
| 1994年09月 |
No. 2 blast furnace in Osaka Works ceased operation. |
| 1998年 |
Three Works obtained ISO9001 certification. |
| 1998年07月 |
Moved head office to Nishijima, Nishiyodogawa-ku, Osaka. |
| 2000年09月 |
Ceased operating steel bar production line in Osaka Works. |
| 2001年07月 |
Moved head office to Dojimahama, Kita-ku, Osaka (Toyobo Building). |
| 2002年02月 |
Established cooperative sales company, Tokyo D・B Steel Co., Ltd. jointly with Tokyo Tekko Co., Ltd. |
| 2003年11月 |
Established Metal Stock Co.,Ltd. |
| 2003年11月 |
Three Works obtained ISO14001 certification. |
| 2004年09月 |
Formed business alliance with Sanko Seiko Co., Ltd. |
| 2007年03月 |
Replaced rolling mill in Funabashi Works with new mill. |
| 2007年06月 |
Strengthened collaboration with Nippon Steel Corporation.; became its affiliated company, accounted for by equity method. |
| 2007年07月 |
Moved Tokyo Office to Marunouchi, Chiyoda-ku, Tokyo. |
| 2007年08月 |
Held shares mutually with Kyoei Steel, Ltd. |
| 2007年12月 |
Acquired shares of Mitsuboshi Metal Industry Co., Ltd. (as a majority owned subsidiary). |
| 2010年08月 |
Constructed new direct rolling (DR) in Funabashi Works. |
| 2013年07月 |
Tokyo D・B Steel Co., Ltd. - dissolution. |
| 2015年06月 |
Introduction of executive officer system; Reinforcement and completion of the auditor system. |
| 2015年07月 |
Consolidated subsidiary Mitsuboshi Metal Industry Co., Ltd. became complete subsidiary. |
| 2016年03月 |
TOKAI STEEL CORPORATION became complete subsidiary. |
| 2019年03月 |
Asahi Industries Co., Ltd. became a consolidated subsidiary by tender offer. |
| 2019年10月 |
Established cooperative sales company, Kanto D-Bar Steel Corporation. jointly with Asahi Industries Co., Ltd. |
| 2024年12月 |
Moved head office to Umeda , Kita-ku, Osaka : (JP Tower Osaka). |
| 2025年06月 |
Godo D-Bar Engeneering Corporation. became complete subsidiary. |
