| Nov | 1969 | Yamamoto Special Steel Shokai was founded as sole proprietorship at 6 hannan-cho, Abeno-ku, Osaka. Started selling stainless seamless pipes. |
|---|---|---|
| 1978 | Our head office moved to 4 Kujo Minami, Nishi-ku, Osaka, and a warehouse opened. | |
| Jul | 1980 | Yamamoto Special Steel Shokai was renamed to YAMAMOTO SPECIAL STEEL CO.,LTD. |
| Aug | 1984 | Our head office moved to 4 Namiyoke, Minato-ku, Osaka and a warehouse opened. |
| Jun | 1986 | We started acting as general agent in west japan for Kobe Steel,Ltd., Today's KOBELCO STEEL TUBE CO.,LTD. |
| Jan | 1988 | Our head office moved to 1 MinamiIchioka, Minato-ku, Osaka and a warehouse opened. |
| Sep | 1995 | A second warehouse opened at 1 Namiyoke, Minato-ku, Osaka. |
| May | 1998 | The head office was enlarged at 1 Minamiichioka, Minato-ku, Osaka. |
| Sep | 2002 | Private placement bonds was issued at the Kujo branch of the Bank of Tokyo-Mitsubishi UFJ, Ltd. |
| Jul | 2005 | Another private placement bonds was issued at the Kujo branch of the Bank of Tokyo-Mitsubishi UFJ, Ltd. |
| Jun | 2006 | Yoshikazu Yamamoto became CEO. |
| Oct | 2009 | The company started selling duplex seamless stainless steel pipes in stock. |
| Sep | 2010 | The company started selling duplex stainless joints in stock. |
| May | 2011 | Our sales office opened at Yaesu, Chuo-ku, Tokyo. |
| Dec | 2013 | Our Online quoting system called Yamatoku-Net was started. |
| May | 2014 | Our head office moved to 1 , Ishida, Minato-ku, Osaka. |
| Jun | 2015 | Our sales office moved to Nihonbashihoncho,Chuo-ku,Tokyo. |
| Sep | 2018 | Private placement bonds was issued at the Kujo branch of the Bank of The Kinki Osaka Bank, Limited. |
| Nov | 2019 | We are celebrating the 50th anniversary in business. |
| Mar | 2021 | Our sales office moved to Shimbashi,Minato-ku,Tokyo. |
| May | 2023 | We was acquired all shares of TAKAHASHI STAINLESS CO,.LTD and made it a group subsidiary. |
