| Company name | Group | Parent | Subsidiary | Customer | Supplier | Alliance | Bank | Shareholder |
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| Ningbo Sanyo Special Steel Products Co., Ltd. | ||||||||
| Ovako Group AB | ||||||||
| SANYO SPECIAL STEEL U.S.A., INC. | ||||||||
| Santoku Computer Service Co., Ltd. | ||||||||
| Santoku Kogyo Co., Ltd. | ||||||||
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| Santoku Tech Co., Ltd. | ||||||||
| Sanyo Special Steel (Thailand) Co., Ltd. | ||||||||
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| Ningbo Sanyo Special Steel Products Co.,Ltd. | ||||||||
| Yamato Special Industry Co., Ltd. | ||||||||
| Ovako AB |
Founded as Sanyo Steel Works
3-ton electric furnace
Founded as Sanyo Steel Works
3-t electric arc furnace
Establishment of Sanyo Steel Co., Ltd. (registration) : Commencement of bearing steel production
Factory panorama
Incorporation registered : Bearing steel production begun
View of factories
Listing on the Osaka Stock Exchange : Designated by the Japanese government as a specialist bearing steel manufacturer
Listed on Osaka Securities Exchange (OSE) : Designated by government as an authorized bearing steel mill
Listing on the Tokyo Stock Exchange
Listed on Tokyo Stock Exchange (TSE)
Name changed to Sanyo Special Steel Co., Ltd. : Completion of seamless steel pipe manufacturing equipment (2,000-ton hot‑die extrusion press)
Renamed as Sanyo Special Steel Co., Ltd. : Seamless steel tube plant (2,000-t hot extrusion press) completed
Completion of slab rolling machine and large‑size rolling machine
Cogging mill and large diameter bar rolling mill completed
Absorption merger of Osaka Special Steel Co., Ltd.
Merged with Osaka Special Steel Co., Ltd.
No.1 60-ton electric furnace
60-t electric arc furnace
Application for corporate rehabilitation and delisting
Corporate Rehabilitation Law filed for/Stock de-listed
Order of Shinkansen bearing steel from Japanese National Railways
Order for bearing steel for Shinkansen (bullet trains) received from Japan National Railways
Completion of seamless steel pipe manufacturing equipment (Asseml Mill)
Seamless steel tube plant (assel tube rolling mill) completed
Completion of 60‑ton 2nd electric furnace : Conclusion of corporate rehabilitation procedures
60-t No.2 electric arc furnace completed : Rehabilitation proceedings completed
Establishment of Yōkō Manufacturing Co., Ltd.
Yohkoh Bussan Co., Ltd. founded
Re‑listing on the Osaka Stock Exchange
Re-listing of shares on the Tokyo Stock Exchange
Re-listed on OSE
Establishment of Yantoku Industrial Co., Ltd.: Completion of the second steel plant
Construction work of the second steel plant
Santoku Kogyo Co., Ltd. founded : No. 2 steelmaking plant completed
Construction of No.2 steelmaking plant
Completion of 3,000‑ton high‑speed forging press
3,000-t high speed forging press completed
Re‑listing on the Tokyo Stock Exchange
Re-listed on TSE
Completion of the second bar line factory
No.2 Bar & Wire Rod mill completed
Ultra‑low‑oxygen bearing steel adopted by the Japan Iron & Steel Federation as a sample for steel‑gas analysis : Completion of metal powder manufacturing and processing plants
Ultra low oxygen bearing steel supplied to the Iron and Steel Institute of Japan as intrasteel gas analytical control samples Metal powder manufacturing and processing plants completed
Establishment of Santoku Computer Service Co., Ltd. : Establishment of SKJ Metal Industries Co., Ltd. (Thailand)
Santoku Computer Service Co., Ltd. founded : SKJ Metal Industries Co., Ltd. founded in Thailand
Co‑development of ultra‑high‑purity bearing steel with NSK Ltd.
Premium cleanliness bearing steel developed jointly with NSK Ltd.
Completion of 1,500‑ton high‑speed forging press
Building 2 of the Technology Research Institute
1,500-t high speed forging press completed
No.2 technical research laboratories
Establishment of the Sanyo Special Steel Cultural Promotion Foundation
Sanyo Special Steel Cultural Promotion Foundation established
P.T. SANYO SPECIAL STEEL INDONESIA founded
Sanyo Special Steel U.S.A., Inc. (USA) established
SANYO SPECIAL STEEL U.S.A., INC. founded
"Large-scale development of the planetary inclined roll rolling machine and advanced special steel billet manufacturing technology" awarded the Daikouchi Memorial Production Award
Okochi Memorial Production Award granted by Okochi Memorial Foundation
Santo K Precision Co., Ltd. established
Santoku Seiken Co., Ltd. founded
Establishment of Ningbo Sanyo Special Steel Products Co., Ltd. (China)
Large rolling machine
Ningbo Sanyo Special Steel Products Co., Ltd. founded in China
Large-diameter bar rolling mill
Advanced Green Components, LLC founded in U.S.A.
Santo K Processing Co., Ltd. merged into Yamato Precision Steel Co., Ltd. and renamed to Santo Tech Co., Ltd.
Santoku Precision Forging Co., Ltd. merged with Santoku Ring Processing Co., Ltd.; renamed to Santoku Tech Co., Ltd.
Received special award from ASTM International: electric furnace slag first used as a resource-recycling road pavement material
Commended by ASTM International : Electric arc furnace slag recycled into road-paving materials
World's first phased-array ultrasonic inspection machine introduced to a mass production
Becomes an associate company applying the equity method: phased array ultrasonic flaw detector applied to mass production process (world first)
Phased array ultrasonic flaw detector
Became Nippon Steel Corporation’s affiliate accounted for by the equity method
Sanyo Special Steel Trading (Shanghai) Co., Ltd. (China) established: Yamato Techno Co., Ltd. established: 5,000-ton free forging press completed
5,000-ton free forging press
SANYO SPECIAL STEEL TRADING (SHANGHAI) CO., LTD. founded
Santoku Technos Co., Ltd. founded
5,000-t free forging press completed
60-ton continuous casting equipment completed: Mahindra Sanyo Special Steel Pvt. Ltd. (India) (now Sanyo Special Steel Manufacturing India Pvt. Ltd.) established
60-ton continuous casting equipment
Sanyo Special Steel India Pvt. Ltd. founded
60-t continuous caster completed
Mahindra Sanyo Special Steel Pvt. Ltd. founded in India
Siam Sanyo Special Steel Product Co., Ltd. (Thailand) established
Siam Sanyo Special Steel Product Co., Ltd. founded in Thailand
Achieved world record of 100 consecutive castings with a single-tandish bearing steel using the second steel plant's continuous casting equipment: Sanyo Special Steel Manufacturing de México, S.A. de C.V. (Mexico) established
Sequential casting world record of 100 heats with a single tundich (for bearing steel) achieved at No.2 steelmaking plant's continuous caster
Sanyo Special Steel Manufacturing de Mexico, S.A. de C.V. founded in Mexico
"Development of high-yield process for ultra-high purity bearing steel" awarded the Daikouchi Memorial Production Award: second powder plant completed
Received the Okochi Production Prize award at “Development of High Productivity Process of Ultra-High-Cleanliness Bearing Steel”
Santo Techno Inc. merged into Yamato Industry Inc.: Mahindra Sanyo Special Steel Pvt. Ltd. (India) (now Sanyo Special Steel Manufacturing India Pvt. Ltd.) became a subsidiary: development of ultra-high purity steel manufacturing process (SURP)
Made Mahindra Sanyo Special Steel Pvt.Ltd. (India) a subsidiary
Development of Sanyo Ultra Refining Process (SURP)
Becomes a consolidated subsidiary of Nippon Steel Corporation: Ovako AB (Sweden) fully acquired as a subsidiary
Became a subsidiary of NIPPON STEEL CORPORATION
Made Ovako AB (Sweden) a wholly-owned subsidiary
Santo Guarantee Service Inc. merged into Yamato Industry Inc.
Moved from First Section to Prime Market due to Tokyo Stock Exchange market classification review: Mahindra Sanyo Special Steel Pvt. Ltd. (India) renamed to Sanyo Special Steel Manufacturing India Pvt. Ltd.
Becomes a wholly-owned subsidiary of Nippon Steel & Corp.: Delisting of stock
The Sanyo Special Steel Group expressed condolences to those who lost their lives in the Kumamoto Earthquake of Reiwa 8 and extended sympathies to the victims. They have decided to donate 5 million yen in aid through the Japanese Red Cross Society to support assistance and reconstruction efforts. We sincerely pray for the early recovery of the affected areas.