| 1934 |
Founded in 1934. |
| 1934-11-23 |
Established in Adachi-ku, Tokyo, with a capital of 1 million yen, for the purpose of manufacturing and selling various steel products. |
| 1934-11-23 |
Establishment |
| 1934-11-23 |
Established in Adachi-ku, Tokyo, with capital of 1 million yen for manufacturing and selling various steel materials. (Founded November 23, 1934) Since then, engaged in the production of various special steels at two open-hearth furnaces, one electric furnace, and medium and small rolling mills. |
| 1953-03 |
Absorbed and merged with Toa Steel Pipe Industry Co., Ltd. |
| 1953-03 |
Absorbed Toa Steel Pipe Industry Co., Ltd. (capital 2.5 million yen). |
| 1960-07 |
Acquired factory land in Kurashiki City, Okayama Prefecture. |
| 1960-07 |
Acquired factory land (about 503,000 square meters) in Kurashiki City, Okayama Prefecture, based on factory site acquisition regulations. |
| 1962-10 |
Completion and start of operation of the first blast furnace at Okayama Factory. |
| 1962-10 |
Completed and started operation of the first open-hearth furnace at Okayama Factory. Subsequently, completed five 120-ton open-hearth furnaces, and medium and small rolling facilities, engaged in the production of medium and small shaped steels. |
| 1969-01 |
Completion of large-scale rolling mill at Okayama Factory, start of H-shaped steel production. |
| 1969-02 |
Transferred and started production at Kochi Factory, as Tosa Electric Steel Works. |
| 1969-02 |
Received transfer of the Kochi Factory from Tosa Electric Steel Works Co., Ltd., and started production as our Kochi Factory. |
| 1970-02 |
Acquired factory land in Kitakyushu City, Fukuoka Prefecture. |
| 1970-02 |
Acquired factory land (about 154,000 square meters) in Kitakyushu City, Fukuoka Prefecture. |
| 1971-09 |
Absorbed and merged with Daimaru Steel Co., Ltd., and started operation as Kyushu Factory. |
| 1971-09 |
Daimaru Steel Co., Ltd. (Capital: 5 million yen, acquired all shares since July 1969) was absorbed and merged, and began operation as our Kyushu factory. |
| 1971-11 |
Updated equipment at Kyushu Factory and resumed production. |
| 1971-11 |
Completion of two 50-ton electric furnaces and two continuous casting facilities at Kyushu factory, updating and rationalizing equipment, and starting production. |
| 1973-02 |
Completion of medium-sized rolling mill at Kyushu Factory, start of medium steel section production. |
| 1973-06 |
Completion and start of operation of continuous casting equipment at Okayama Factory. |
| 1974-05 |
Relocated headquarters from Adachi-ku, Tokyo, to Chiyoda-ku. |
| 1974-05 |
Relocated headquarters from Adachi-ku, Tokyo to Chiyoda-ku. |
| 1974-07 |
Listed on the Second Section of the Tokyo Stock Exchange. |
| 1974-07 |
Listed on the Second Section of the Tokyo Stock Exchange. |
| 1975-12 |
Absorbed and merged with Tosa Electric Steel Works, started production at Takamatsu Factory. |
| 1975-12 |
Absorbed Tosa Electric Steel Co., Ltd., and started production at our Takamatsu factory. |
| 1976-09 |
Listed on the First Section of the Tokyo Stock Exchange and the First Section of the Osaka Securities Exchange. |
| 1976-09 |
Listed on the First Section of the Tokyo Stock Exchange and the Osaka Securities Exchange. |
| 1977-12 |
Stopped operation of blast furnace at Okayama Factory. |
| 1978-01 |
Closed Edogawa Factory. |
| 1978-04 |
Completed and started operation of 140-ton electric furnaces No. 1 and No. 2 at Okayama Factory. |
| 1978-12 |
Completed remodeling of medium-sized steel section plant at Okayama Factory and started production. |
| 1979-01 |
Completion and start of production at Okayama Plant Small Bar Steel Factory. |
| 1979-04 |
Opening of Osaka Sales Office, successful casting of beams and blanks at Kochi Plant. |
| 1979-09 |
Completion of renovation work at Senju Plant Large and Medium Shape Steel Factory, start of production. |
| 1984-07 |
Completion of Kyushu Plant Large Rolling Mill, start of production of large H-shaped steel, universal plates. |
| 1986-01 |
Closure of Senju Plant. |
| 1987-03 |
Closure of Kochi Plant. |
| 1987-04 |
Renaming of Osaka Sales Office to Osaka Branch, establishment of Amazing Co., Ltd. |
| 1987-04 |
Renamed Osaka Sales Office to Osaka Branch, established Amazing Co., Ltd. (subsidiary). |
| 1989-08 |
Completion and start of operation of 130-ton DC Electric Furnace at Kyushu Plant. |
| 1991-10 |
Completion of Hot Rolled Wide Strip Steel Rolling Mill at Okayama Plant, start of hot coil production. |
| 1992-04 |
Completion and start of operation of 150-ton DC Electric Furnace Wide Strip Steel Mill at Okayama Plant. |
| 1992-12 |
Acquisition of factory site in Utsunomiya City, Tochigi Prefecture. |
| 1992-12 |
Acquired factory land (about 147,000 square meters) in Utsunomiya City, Tochigi Prefecture. |
| 1994-02 |
Start of steel sheet pile production at Kyushu Plant Large Rolling Mill. |
| 1994-04 |
Establishment of Nagoya Branch, Kyushu Branch, and Takamatsu Sales Office. |
| 1994-04 |
Established Nagoya Branch, Kyushu Branch, Hiroshima Sales Office, and Takamatsu Sales Office. |
| 1995-04 |
Completion of Pickling Line for Hot Rolled Wide Strip Steel at Okayama Plant, start of pickled coil production. |
| 1995-08 |
Completion and start of operation of Rolling Mill at Utsunomiya Plant. |
| 1995-11 |
Completion and start of operation of Steel Manufacturing Plant at Utsunomiya Plant. |
| 1996-10 |
Completion of 60-ton DC Electric Furnace at Takamatsu Plant, renewal of bar rolling equipment, start of production. |
| 1997-02 |
Completion and start of operation of Wire Rod Rolling Equipment at Takamatsu Plant. |
| 1997-03 |
Completion of Cold Rolling Equipment and Surface Treatment Equipment at Okayama Plant, start of galvanized coil production. |
| 1999-04 |
Establishment of Utsunomiya Sales Office. |
| 1999-11 |
Renamed the Kyushu Branch to Kyushu Sales Office and integrated Hiroshima Sales Office into Osaka Branch. |
| 2000-01 |
All factories completed ISO9002 (Quality System) certification. |
| 2001-11 |
All factories completed ISO14001 (Environmental Management System) certification. |
| 2001-11 |
All factories completed ISO 14001 (Environmental Management System) certification. |
| 2003-08 |
All factories completed ISO9001 (Quality System 2000 Edition) certification. |
| 2003-08 |
All factories completed ISO 9001 (Quality System 2000 Edition) certification. |
| 2004-06 |
Integrated Nagoya Branch into Osaka Branch. |
| 2004-09 |
Completed the new equipment for the leveler shear line at Okayama Factory and started production of cut sheets. |
| 2004-11 |
Integrated Takamatsu Sales Office into Osaka Branch. |
| 2005-04 |
Started construction of new thick plate manufacturing equipment at Kyushu Factory. |
| 2005-09 |
Decided to acquire land for a new factory in Tahara City, Aichi Prefecture. |
| 2005-09 |
Decided to acquire new factory site (104 hectares) in Tahara City, Aichi Prefecture. |
| 2007-01 |
Completed thick plate manufacturing equipment at Kyushu Factory. |
| 2007-04 |
Completed land acquisition for Tahara Factory and started construction of the new factory. |
| 2008-01 |
Opened Okayama Sales Office. |
| 2008-01 |
Established Tahara Sales Office. |
| 2009-04 |
Opened Tahara Sales Office and renamed Osaka Branch to Osaka Sales Office. |
| 2009-11 |
Completed the hot-rolled wide strip steel rolling mill at Tahara Factory and started production of hot coils. |
| 2009-12 |
Completed the leveler shear line equipment at Tahara Factory and started production of cut sheets. |
| 2009-12 |
Completed Tahara Factory hot-rolled wide strip steel rolling mill, started production of hot coils. |
| 2010-03 |
Completed the square steel pipe equipment at Tahara Factory and started production. |
| 2010-03 |
Completed Tahara Factory leveler shear line equipment, started production of cut sheets. |
| 2010-06 |
Started operation of the steelmaking plant at Tahara Factory. |
| 2010-06 |
Completed Tahara Factory square steel pipe equipment, started production. |
| 2011-08 |
Completed the hot-rolled wide strip steel pickling equipment at Tahara Factory and started production of pickled coils. |
| 2011-08 |
Started operation of Tahara Steelmaking Factory. |
| 2012-03 |
Production stopped at Takamatsu Factory. |
| 2012-03 |
Completed Tahara Factory hot-rolled wide strip steel pickling equipment, started production of pickled coils. |
| 2012-04 |
Established Takamatsu Steel Center. |
| 2012-04 |
Production stopped at Takamatsu Steel Factory. |
| 2013-04 |
Abolished Osaka Sales Office and Tahara Sales Office, established Osaka Branch and Nagoya Branch. |
| 2013-04 |
Established Takamatsu Steel Center. |
| 2015-04 |
Abolished Kyushu Sales Office and established Kyushu Branch. |
| 2015-04 |
Abolished Osaka Sales Office and Tahara Sales Office, established Osaka Branch and Nagoya Branch. |
| 2017-06 |
Announced the long-term environmental vision "Tokyo Steel EcoVision 2050". |
| 2017-06 |
Abolished Kyushu Sales Office and established Kyushu Branch. |
| 2018-01 |
Installed and started operation of No.4 CCM equipment at Okayama Factory. |
| 2018-01 |
Announced the long-term environmental vision "Tokyo Steel EcoVision 2050". |
| 2020-08 |
Decided to acquire 66,100㎡ of land adjacent to Utsunomiya Factory. |
| 2020-08 |
Installed and commenced operation of No. 4 CCM equipment at Okayama Factory. |
| 2021-06 |
Revised the long-term environmental vision "Tokyo Steel EcoVision 2050". |
| 2021-06 |
Decided to acquire 66,100㎡ of land adjacent to Utsunomiya Factory. |
| 2021-07 |
Completed solar power facilities at four domestic factories. |
| 2021-07 |
Revised the long-term environmental vision "Tokyo Steel EcoVision 2050". |
| 2022-06 |
Established Nagoya Satellite Yard. |
| 2022-06 |
Completed solar power facilities at four domestic factories. |
| 2022-12 |
Restarted hot rolling mill at Okayama Factory. |
| 2022-12 |
Established Nagoya Satellite Yard. |
| 2024-06 |
Established Kansai Satellite Yard. |
| 2024-09 |
Reactivated pickling equipment at Tahara Factory. |
| 2025-06 |
Established Tokyo Bay Area Satellite Yard. |
