| 1926 | Maruichi Production founded as a bicycle parts production company . | ![]() |
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| 1935 | Started producing bicycle steel pipes. | |
| 1940 | Company name changed to Maruichi Steel Tube Works and separated from its bicycle parts division. | |
| 1947 | Maruichi Steel Tube Ltd. established. | |
| 1956 | Osaka Office rearranged and Maruichi Kohan Ltd. founded. | |
| 1957 | Osaka Plant opened. | |
| 1958 | Tokyo Office opened. Electric tube welding system imported from Abby Etona Co. of US. Changed from welding system to seem-welding system. | |
| 1960 | Changed trade name to Maruichi Steel Tube Ltd. Nagoya Office opened. | |
| 1961 | Tokyo Plant opened. | |
| 1962 | Company listed 2nd board in the Tokyo and Osaka Stock Exchange. | |
| 1964 | Company listed 1st board in the Tokyo and Osaka Stock Exchange. Fukuoka Office opened. | |
| 1965 | Sakai Plant opened. | |
| 1966 | Nagoya Plant opened (merged into present Nagoya Plant in 1984). Hiroshima Office opened. | |
| 1970 | Hokkaido Maruichi Steel Tube Ltd. founded. Sapporo Office opened. | |
| 1971 | Indonesia Steel Tube Works Ltd. (ISTW) founded. | |
| 1972 | Sakai Pole Plant opened. Osaka office opened. | |
| 1973 | Tokyo No.2 Plant newly opened. | |
| 1974 | Shikoku Maruichi Steel Tube Ltd. founded. Kyushu Maruichi Steel Tube Ltd. founded. | |
| 1977 | Nagoya Second Plant (present Nagoya Plant) opened. Tachibana Industry Co.,Ltd. and Shikoku Maruichi Steel Tube Ltd. merged. |
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| 1978 | Main office relocated to present address, Kitahorie, Nishi-ku, Osaka. Maruichi American Corporation (MAC) established. | |
| 1989 | Takuma Plant opened. | |
| 1995 | Kashima Pole Plant opened. Tokyo No.2 Plant renewal completed. | |
| 1998 | Sapporo Plant united into Tomakomai Plant under Hokkaido Maruichi Steel Tube Ltd. | |
| 2000 | Hiroshima Office and warehouse opened. | |
| 2001 | Annealing facilities built in Takuma Plant. | |
| 2002 | Tokyo No.2 Plant's new warehouse constructed. Hamamatsu's new warehouse completed. | |
| 2003 | New warehouse and cutting factory opened in Nagoya Plant. | |
| 2004 | Kyushu Maruichi Steel Tube Ltd. renewal completed. | |
| 2005 | New factory opened in Tomakomai Plant of Hokkaido Maruichi Steel Tube Ltd. | |
| 2006 | New warehouse opened in Nagoya Plant. Maruichi Metal Product(Foshan)Co.,Ltd.(MMP) founded. Sun Steel Corporation joins Maruichi Steel tube Group. |
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| 2007 | New warehouse building opened in Okayaka warehouse. New plant built in Sakai plant. SEIKEI STEEL TUBE CORPORATION joins Maruichi Steel Tube Group. |
|
| 2008 | Leavitt
Tube Company,
LLC (LTC) joins,and
it has become
one of subsidiary
companies of Maruichi
Steel Tube Ltd. Sun Steel Joint Stock Company(Sunsco) has become one of subsidiary companies of Maruichi Steel Tube Ltd. |
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