April 1937	Established with 500,000 yen in capital at 30 Nagamachi Azahigashiurakita, Sendai City.
1940☆	Commerced the production of heat-resistant steel.
1948☆	Began to supply heat-resistant steel to Toyota Motor Co., Ltd.
1960☆	First in the world to develop the corrosion-resistant, soft-magnetic stainless "K-M steel."
August 1961	The foundation for Promotion of Metallic Materials was established, and began annually awarding a financial incentive (The Harada Research Encouraging Award).
November 1975	Started manufacturing and selling of processed products.
October 1980	Started heat treatment business.
February 1986	Opened a heat treatment plant in Tsuchiura.
May 1990	Completed and started operation of a new heat treatment plant in Murata.
July 1991	Completed and started operation of a new precision processing plant.
November 1991	Capital increased to 827.5 million yen.
April 1992	Changed the Murata Plant to the main office and plant.
May 1992	Completed and started operation of a secondary machining plant (currently, the steel plant).
October 1993	Completed and started operation of a cold-forging plant.
December 1993	Completed and started operation of a new melting and forging plant.
September 1997	The shopping mall "The Mall Sendai Nagamachi" opened.
September 1998	Won TPM Excellent Award for Total Productive Maintenance improvement activities.
July 2005	Won the "21st Century Invention Award" of the Japan Institute of Invention and Innovation for the next generation, Pb-free, free-cutting steel "TiCS."
November 2007	Won the "Tohoku Bureau of Economy, Trade and Industry Chief's Award" of the Japan Institute of Invention for the high hardness, soft-magnetic stainless steel "K-M57."
May 2011	Established TOHOKU Manufacturing (Thailand) Co., Ltd. in Thailand.
September 2013	Developed soft-magnetic stainless steel "K-M38CS" for fuel batteries in collaboration with Tohoku University.
December 2013	Developed new magnetostrictive materials in collaboration with Hirosaki University and Tohoku University.
January 2016	The surface treatment process "Kirin Coat C" series was qualified as MIYAGI SUGURE MONO.
February 2016	Developed an IoT sensor system in collaboration with the Industrial Technology Institute of the Miyagi Prefectural Government.
April 2016	Developed the surface treatment "TM3 (TM Cube) series" in collaboration with Daido Steel Co., Ltd.
May 2017	Established TOHOKU STEEL INDIA PRIVATE LIMITED in India. (Under Construction)
February 2018	Conducted joint development with Tohoku University for magnetostrictive composite material sheets with vibration power generation that surpasses that of piezoelectric transducers.