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

Company Profile



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.

-Operates business as follows:

Segment Main Products
High-grade Metal Products Materials for automotive use
Formed/forged Materials Forged automotive products (high-grade, ductile steel (HNM); forged products for delivery/transport equipment; heat-resistant forged parts for exhaust systems (hercunite); aluminum parts
Magnetic materials, power electronics <Magnetic Materials> rare-earth magnetic materials (Neomax), ferrite magnetic material, and other magnetic materials; as well as research on uses for their applications
<Power Electronics> Soft-magnetic material (amorphous metal “Metglas”, nano-crystal soft-magnetic material (Finemet), soft ferrite and research on its uses, ceramic products
Wires, Cables, and Related Products Automotive electric parts, brake hoses


-Delisted on December 29, 2022.

-As of March 31, 2023, K.K. BCJ-52 owns 100% of the company's stock.


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

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
-Copper strips
-Silicon nitride

Battery Materials
-Clad material
-Clad material for electro-bonding
-Aluminum 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
-Onboard sensors


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.

Supplemental Information 1