Proterial, Ltd. (Formerly Hitachi Metals, Ltd.)

Company Profile

■URL

https://www.proterial.com/e/

■Address

Toyosu Prime Square, 5-6-36 Toyosu, Koto-ku, Tokyo 135-0061, Japan

Business Overview

-The Company is a manufacturer of iron and metals, producing high-grade special steel and various types of magnets.

-The Company delivers products in the following areas of business: automotive, industrial infrastructure, and electronics.

-Products are listed below. (As of Mar 31, 2025)

Segment	Main Products
High-grade Metal Products	Steel for tools, automotive materials, materials for knife blades and razor blades, precision cast products, aircraft, and materials for energy use, materials for displays, semiconductor packaging materials, battery materials
Rolls	Various types of rolls, injection molding machine parts, structural ceramic parts, structural parts for steel frames
Magnetic materials	Neodymium magnets [NEOMAX], ferrite magnets, and other various magnets and their applications
Power electronics	Soft magnetic materials and their applications, ceramic products
Wiring	Industrial wires, equipment wires, electrical materials, processed cables
Automotive parts	Automotive electrical components, brake hoses, industrial rubber

Proterial to transfer automotive casting and ceramic filter businesses to US investment firm
-Proterial, Ltd. (Proterial) announced on September 9 that it will transfer its automotive casting and exhaust gas ceramic filter businesses currently run by Proterial and its subsidiaries to a US-based investment company. The transfer will take place in January 2026. The subjects of the transfer to the investment company are Proterial’s Moka Works (Moka City, Tochigi Prefecture) and the Casting Technology Research Laboratory (same) as well as its subsidiaries: Proterial Machinery, Ltd. (same), Kyushu Techno Metal, Ltd. (Kanda Town, Fukuoka Prefecture), NamYang Metals Co., Ltd. (South Korea), HNV Castings Private Limited (India), and Effingham Machining & Assembly Components, Inc. (Illinois, the U.S.). The company’s engine and exhaust-related automotive parts business, including ductile cast iron products, heat-resistant casting components, and honeycomb ceramics filters, is subject to the transfer. (From an article in the Nikkan Jidosha Shimbun on September 11, 2025)

Shareholders

-Delisted on December 29, 2022.

-As of March 31, 2024, K.K. BCJ-52 owns 100% of the company's stock.

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Products

Products for Electric Vehicles
Motor materials
-Neodymium, iron, and boron sintered magnetic material NEOMAX
-Ferrite magnetic material
-Enameled wires for power motors used in electric and hybrid-electric vehicles
-Highly function pure copper HiFC
-Power-supply parts
-Motor housings with water-cooling circuits for electric vehicles
-Magnetic slot wedges for Motors
-Permendur (Soft Magnetic Alloy with High Magnetic Flux Density)

Materials for inverters, onboard chargers, DC/DC converters
-Insulation transformers for power-drive circuits (soft ferrite)
-Amorphous powder core HLM50
-Nano-crystal cores (Finemet)
-Insulation transformers (soft ferrite)
-Choke coils for power-correction circuits
-Common-mode choke coils
-Irregular formed copper strips
-Clad material
-SiC epitaxial wafer
-Copper strips
-Silicon nitride

Battery Materials
-Clad material
-Clad material for electro-bonding
-Aluminium forged battery cases for electric vehicles

Electric Power Harnesses
-High-capacity electric-power cables
-Power-source cables for electric-power compressors (used on air-conditioners)

Materials for Quick-charging
-Pre-cut cores for reactors used in high-frequency transmissions
-Uncut cores used in high-frequency transmissions

Engine and Exhaust System Parts
-Hercunite for engine and exhaust-system parts
-Turbine wheels
-Nickel-based amorphous filtering material
-Piston-ring material
-Vane and engine-valve material
-Ceramic honeycomb carrier “Cerakat”
-Anti-friction alloys
-Transmission material (copper alloy)

Suspension Parts
-High-quality diecast HV mark, high-vacuum diecast HIVAC-V
-HNM series high-strength ductile cast-iron
-Harnesses for electric parking brakes (EPBs）
-Harnesses for electric brakes
-Brake hoses
-Brake disks

Electric parts
-Neodymium-sintered magnetic NEOMAX
-High-performance magnets for motors
-Ferrite magnets
-Casting magnets
-Bonding magnets
-Coils
-Harnesses
-Onboard sensors

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History

Apr. 1956	Established Hitachi Metals Industry, Ltd. (with capital of 1 billion yen, Hitachi, Ltd. invested 100%).
Oct. 1956	Took over Hitachi, Ltd.'s steel division business, including 5 plants at Tobata, Fukagawa, Kuwana, Wakamatsu and Yasuki and began operations.
Jul. 1961	Established the Kumagai Plant.
Aug. 1961	Issued stocks over the counter.
Oct. 1961	Listed on the Second Section of the Tokyo and Osaka Stock Exchanges.
Aug. 1962	Re-listed on the First Section of the Tokyo and Osaka Stock Exchanges.
Nov. 1965	Established Hitachi Metals America, Ltd. (currently a consolidated subsidiary) in the USA.
Jan. 1967	Merged with Hitachi Metals, Ltd. to change share par value and the company name.
Oct. 1970	Established Hitachi Metals Europe GmbH (currently a consolidated subsidiary, in Germany.
Mar. 1973	Established Hitachi Magnetics Corporation, a magnetic material manufacturing company, in the USA.
Oct. 1975	Established Moka Works, moving facilities from Fukagawa Plant.
Feb. 1979	Established Hitachi Metals Singapore Pte. Ltd. in Singapore.
Mar. 1980	Renamed Tobata Works Kanda Plant to Kyushu Works.
Jan. 1985	Established Facility System Laboratory (called Production System Laboratory since October 1993).
Oct. 1987	Established AAP St. Marys Corporation, an aluminum wheel manufacturer, in the USA.
Sep. 1988	Established Hitachi Metals Electronics (Malaysia) Sdn. Bhd., a magnetic head part manufacturer, in Malaysia.
Oct. 1988	Integrated Moka Works and an electric part plant to form new Moka Works.
Dec. 1989	Established Ward Manufacturing Inc., a pipejoint manufacturing company, in the USA. Established Hitachi Metals North Carolina, Ltd., an electric component ferrite manufacturing company, in the USA.
Oct. 1991	Reorganized ex-Moka Works, dividing it into Moka Works and Electronic Component Device Plant.
Oct. 1993	Separated Metallurgical Research Laboratory from Yasugi Works to form an individual laboratory.
Jun. 1995	Separated Automotive Component Company Molds Center to individually form Molds Laboratory.
Oct. 1995	Merged with Hitachi Ferrite, Co., Ltd., acquiring its Tottori Works and Hitachi Ferrite (Thailand) Ltd.
Nov. 1995	Established Luzon Electronics Technology, Inc., a magnetic head parts manufacturer, in the Philippines.
Jun. 1996	Established Luzon Magnetic, Inc. (currently a consolidated subsidiary) for rare-earth magnetic processing and finishing in the Philippines
Apr. 2000	Merged the die research center into the materials research center.
Nov. 2000	Hitachi Metals America, Ltd. acquired SinterMet, LLC (USA) (currently a consolidated subsidiary), a manufacturer of ultra-hard rolls.
Aug. 2003	Acquired the Amorphous Metal Business Division of Honeywell International, Inc.
Jan. 2005	Established Soft Magnetic Materials Company.
Jan. 2006	Established Hitachi Metals (China), Ltd. in China, which is currently a consolidated subsidiary.
Jan. 2006	Established Hitachi Metals Pvt. Ltd. in India, which is currently a consolidated subsidiary.
Sep. 2006	The Company and Shanghai Baosteel Group jointly established Bao Steel Hitachi Rolls (Nantong) Ltd. (now a consolidated subsidiary) to manufacture and sell cast rolls for hot strip mills in China.
Apr. 2007	Merged with Neomax Co., Ltd. and took over the operations of Neomax's Yamazaki Works, Kumagaya Works, Saga Works, and the research center for magnetic materials.
Jul. 2013	Merged with Hitachi Cable. Established Electric Wire Materials Company.
Apr. 2014	Acquired all the stock shares in Waupaca Foundry, Inc. in the U.S. held by Waupaca Foundry Holdings, Inc. (Currently Hitachi Metals Foundry America, Inc.), turning both companies into consolidated subsidiaries.
Mar. 2015	Solicited a tender offer of stock shares in Hitachi Metals Techno, Ltd. and transferred all of the shares of the company to the tender offeror. As a result, Hitachi Metals Techno, Ltd. ceased being a consolidated subsidiary.
May. 2015	Transferred 51% of Hitachi Tool’s stock shares to Mitsubishi Materials, and as a result, Hitachi Tool ceased being a consolidated subsidiary and its corporate name was changed to Mitsubishi Tool.
Apr. 2016	Established the Eastern Japan, Central Japan, and Western Japan branch offices.
Dec. 2016	Transferred all of the stock shares of the Information Systems Business, including all of the issued shares of HC Networks Ltd., to AAA Holdings.
Jan. 2017	Acquired all of the stock shares held by Sumitomo Metal Mining Co., Ltd. in SH Copper Products, a company accounted for using the equity method at the time, and turned the company into a consolidated subsidiary.
Apr. 2017	Established the Global Research & Innovative Technology Center (GRIT)
Oct. 2017	After acquiring all of the stock shares held by Mitsubishi Materials in Hitachi Metals MMC Superalloy, Ltd., which was a consolidated subsidiary at the time, turned the company into a wholly owned subsidiary. (Since then, the operations of the company were absorbed and merged in April 2018.)
Apr. 2018	Established the North Kanto Office and the Okegawa Plant.
Mar. 2019	Sold AAP St. Marys Corp. (AAP) to Kosei Aluminum Co., Ltd., after transferring all outstanding stock shares, and as a result, AAP was removed as a consolidated subsidiary.
Apr. 2019	Transitioned to a new corporate structure based on two business segments, the metal materials business and the component business, under the "company system" that started from April 2001.
Oct. 2019	Consolidated the metallurgy R&D center and materials R&D center
Oct. 2019	Consolidated the magnetic materials R&D center, electrical wire R&D center, and engineering function engaged in developing power electronics
Apr. 2021	Established the Shinshu Branch
Apr. 2022	Moved from the First Section of the Tokyo Stock Exchange to the Prime Market due to the TSE's reorganization.
Oct. 2022	K.K. BCJ-52 successfully completes public tender offer for the Company's common stock.
Dec. 2022	Delisted from the Prime Market of the Tokyo Stock Exchange.
Jan. 2023	Changed the corporate name from Hitachi Metals Ltd. to Proterial, Ltd. The parent company transferred the shares from the Company to K.K. BCJ-52, based on the buy-back of shares by Hitachi Metals, Ltd.