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Established with capital of 500,000 yen at 30 Higashihara Kita, Miyagino Ward, Sendai City
Established in April 1937 in 30 Nagamachi Asahi East Urahoku, Sendai City with capital of 500,000 yen.
Established with 500,000 yen in capital at 30 Nagamachi Azahigashiurakita, Sendai City.
Start of heat-resistant steel production
Started manufacturing heat-resistant steel in 1940.
Started production of heat-resistant steel.
Start of delivery of heat-resistant steel to Toyota Motor Corporation
Started supplying heat-resistant steel to Toyota Motor Corporation in 1948.
Began supplying heat-resistant steel to Toyota Motor Co., Ltd.
Development of the world's first corrosion-resistant soft magnetic material K-M steel
Developed the world's first stainless steel "K-M Steel" with corrosion resistance and soft magnetic properties in 1960.
First in the world to develop corrosion-resistant, soft-magnetic stainless "K-M steel."
Established the Metal Assistance Foundation, awarding research grants annually (Harada Research Encouragement Award)
Established a fund for the promotion of metal materials in August 1961 and began awarding the "Harada Research Encouragement Award" annually.
The foundation for Promotion of Metallic Materials was established, and began annually awarding a financial incentive (The Harada Research Encouraging Award).
Start of manufacturing and sales of processed products
Started manufacturing and selling processed products in November 1975.
Started manufacturing and selling of processed products.
Start of contract heat treatment processing
Started heat treatment business in October 1980.
Started heat treatment business.
Established Tsuchiura Heat Treatment Plant
Opened a heat treatment plant in Tsuchiura in February 1986.
Opened a heat treatment plant in Tsuchiura.
Completion and start of operation of Murata Heat Treatment Plant
Completed and began operation of a new heat treatment plant in Murata in May 1990.
Completed and started operation of a new heat treatment plant in Murata.
Completion and start of operation of Precision Processing Plant
Completed and began operation of a precision processing plant in July 1991.
Completed and started operation of a new precision processing plant.
Capital increased to 827.5 million yen
In November 1991, capital was increased to 827.5 million yen.
Capital increased to 827.5 million yen.
Changed Murata Plant to headquarters plant
In April 1992, Murata Factory was changed to headquarters and factory.
Changed the Murata Plant to the main office and plant.
Completion and start of operation of secondary processing plant (currently Steel Material Plant)
In May 1992, a secondary processing factory (currently steel materials factory) was completed and operations began.
Completed and started operation of a secondary machining plant (currently, the steel plant).
Completion and start of operation of Cold Forging Plant
In October 1993, a cold forging factory was completed and operations began.
Completed and started operation of a cold-forging plant.
Completion and start of operation of Melting Forging Plant
In December 1993, a new melting and forging factory was completed and operations began.
Completed and started operation of a new melting and forging plant.
Open the shopping center "The Mall Sendai Nagamachi"
In September 1997, the shopping mall "The Mall Sendai Nagamachi" was opened.
The shopping mall "The Mall Sendai Nagamachi" opened.
Received the TPM Excellence Award Category 1
In September 1998, received the TPM Excellence Award for improvement in comprehensive production maintenance activities.
Won TPM Excellent Award for Total Productive Maintenance improvement activities.
Received the 21st Century Invention Encouragement Award from the Invention Association... Next-generation leadless high-speed steel "TiCS"
In July 2005, received the "21st Century Invention Award" from the Japan Invention Association for next-generation Pb-free steel "TiCS".
Won the "21st Century Invention Award" of the Japan Institute of Invention and Innovation for the next generation, Pb-free, free-cutting steel "TiCS."
Received the Tohoku Bureau of Economy, Trade and Industry Award from the Invention Association... High-hardness electromagnetic stainless steel "K-M57"
In November 2007, received the grand prize from the Invention Association for high-hardness and soft magnetic stainless steel "K-M57".
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."
Established TOHOKU Manufacturing (Thailand) Co., Ltd. in the Kingdom of Thailand
In May 2011, established TOHOKU Manufacturing (Thailand) Co., Ltd. in Thailand.
Established TOHOKU Manufacturing (Thailand) Co., Ltd. in Thailand.
Joint development of electromagnetic stainless steel for fuel cells with Tohoku University
In September 2013, jointly developed soft magnetic stainless steel "K-M38CS" for fuel cells with Tohoku University.
Developed soft-magnetic stainless steel "K-M38CS" for fuel batteries in collaboration with Tohoku University.
Joint development of new magnetostrictive materials with Hirosaki University and Tohoku University
In December 2013, jointly developed new magnetic induction materials with Hirosaki University and Tohoku University.
Developed new magnetostrictive materials in collaboration with Hirosaki University and Tohoku University.
Surface hardening treatment method "Kirin Coat® C Series" certified as Miyagi Excellent MONO
In January 2016, surface treatment "Kirin Coat C" series was certified as a recommended product by Miyagi Prefecture.
The surface treatment process "Kirin Coat C" series was qualified as MIYAGI SUGURE MONO.
Joint development of IoT sensor system with Miyagi Prefectural Technology Center
In February 2016, jointly developed IoT sensor system with Miyagi Prefectural Institute of Industrial Technology.
Developed an IoT sensor system in collaboration with the Industrial Technology Institute of the Miyagi Prefectural Government.
Joint development of surface treatment "TM : 3 : (T.M. Cube) Series" with Daito Steel Co., Ltd.
In April 2016, jointly developed surface treatment "TM:3:(TM Cube) series" with Daido Steel.
Developed the surface treatment "TM : 3 : (TM Cube) series" in collaboration with Daido Steel Co., Ltd.
Established TOHOKU STEEL INDIA PRIVATE LIMITED in the Republic of India
In May 2017, established TOHOKU STEEL INDIA PRIVATE LIMITED in India (under construction).
Established TOHOKU STEEL INDIA PRIVATE LIMITED in India. (Under Construction)
Joint development of magnetostrictive clad material with vibration generation function surpassing piezoelectric elements with Tohoku University
In February 2018, jointly developed vibration power generation magnetic induction composite material sheet with Tohoku University.
Conducted joint development with Tohoku University for magnetostrictive composite material sheets with vibration power generation that surpasses that of piezoelectric transducers.
Tohoku Special Steel carried out the consolidation of common shares effective on October 21, 2026, based on the resolution of the extraordinary general meeting of shareholders held on September 16, 2026. No claims under Article 182-3 of the Companies Act were made up to the effective date. Additionally, by the day before the effective date, two shareholders had made a share repurchase claim for a total of 1,300 shares.
Tohoku Special Steel Group will continue to sponsor Sendai 89ERS for the 2026-27 season. Since 2021, we have supported the team's philosophy of 'building communities through basketball'. We will continue to contribute to the local community by supporting regional sports promotion and next-generation development.
Tohoku Special Steel Co., Ltd. announced planned changes to its executive officer structure. Details are provided in the attached PDF.
Tohoku Special Steel Co., Ltd. apologized for an error in the link destination of the QR code in an advertisement published in the Japan Agricultural Newspaper on June 12, and announced guidance to the correct URL and measures to prevent recurrence.
Employees of Tohoku Special Steel will appear on TV Tokyo's "Connecting Green People." The program introduces individuals working on SDGs, and this time it features the development of the tomato pest control device "Tomatable." The broadcast is scheduled for June 9, 2026, and will also be available on the official website afterward.
Tohoku Special Steel Co., Ltd. announced that due to rising raw material and energy costs, it will increase the sales prices of special steel products, special alloys, and precision processed products, as well as heat treatment processing fees by more than 10% starting from contracts in May 2026. The company will continue to monitor cost trends and consider further price increases as necessary.
Tohoku Special Steel visited the NIMS research facility to observe advanced research sites. Participants aimed to promote technological development and enhance development mindset, advancing research activities toward the 2030 vision. The visit is part of the company's efforts to support R&D activities and strengthen collaboration.
Tohoku Special Steel Co., Ltd. will exhibit at the 9th Adhesion and Bonding Expo held from November 12 to 14, 2025. The company will showcase its material development and processing, including diffusion bonding technology and methods that meet diverse bonding needs. The exhibition will include samples with flow channel structures and magnetostrictive clad materials.
Tohoku Special Steel Co., Ltd. contributed an article to the metal magazine "Metal" in the November 2025 issue, discussing the characteristics of Fe-Co alloys as magnetic materials and the current state of industrial applications. The company pioneered the development of corrosion-resistant soft magnetic materials, offering a range of Fe-Co products and magnetostrictive clad materials. The article presents the alloy’s features and future prospects, incorporating the company’s experience and insights.
The 2025 entry ceremony was organized and managed by young employees to foster independence and teamwork. New employees participated in workplace introductions using videos and quizzes, creating an event that broke away from traditional ceremonies. Employees who joined in 2023 also participated in planning and management, promoting cross-departmental collaboration and information sharing.