Building the Future. – The Strength of M

M is for the future (Mirai) and the markets (Māketto)
we aim to develop,aiming to bring satisfaction (Manzoku)
to everyone (Minasama).

Message from the President


MM&KENZAI Corporation is a trading house that specializes in steel. It was established in November 2014, taking over the steel products for construction businesses and ferrous raw materials businesses of Mitsui & Co. Steel Ltd. and Metal One Corporation. Supported by the information network of MITSUI & CO., LTD., Mitsubishi Corporation, and Sojitz Corporation, shareholders in both our parent companies, and in cooperation with their group companies, we are involved in the construction of buildings and infrastructure needed in people’s lives through the trading, stocking, and processing of steel products for construction. Our business also covers construction, ferrous raw materials, and more.

At present, all employees are coming together to work on two things in particular. One is to create new functions. Thanks to our relationship with our shareholders’ group companies, we are fortunate to have a large number of excellent customers. With major changes taking place in the Japanese and international economies, we are constantly asking ourselves what functions are necessary to maintain the trust of customers. Whatever tasks we face, we are working on them, making an effort to create new functions, and continue to be a company valued by its customers for them.

The other companywide effort is to transform the way we work. MM&KENZAI Corporation handles a wide variety of work as a specialized trading house, and this involves an enormous amount of work in total. In order to avoid losing sight of the purpose of each job and the role we play, I feel it is necessary to rethink the work we are engaged in and by constantly reexamining the methods we use and why we use them for each job, we will be able to replace old methods with more efficient, more functional ways to succeed without getting obsessed with conventional ways.

Companies will not make any progress if they are stuck in a rut. I will make sure that MM&KENZAI Corporation responds to the trust that our long-established customers have placed in us by making us ready to take on the challenges that may arise at any time.

President &CEO
Masaaki Miyazawa

Opening Markets of the Future [="M"irai]


  • 1A one-stop solution provider of steel

    We contribute to customers as a “one-stop solution provider”, who deals with not only ferrous scraps that come out of the demolition of existing buildings, but also structural steel products. When an old building is demolished, we deal with the ferrous scrap, which will be used as a raw material for steel products. When a new building is constructed, we supply a wide range of materials from civil engineering-related parts to structural components and outer accessories such as steel pipe piles, foundations, deformed bars, fabricated steel-frames, outer walls, fences, and the like. This wide range of items we deal with enables us to service a variety of customer needs, with a courteous and attentive manner.

  • 2A broad-based network backed by corporate groups

    We have a broad-based network backed by the group strength of our parent companies—Mitsui & Co. Steel Ltd. and Metal One Corporation—and their parent companies—MITSUI & CO., LTD., Mitsubishi Corporation and Sojitz Corporation. We provide services best suited to customers’ needs by utilizing the most up-to-date information and a solid understanding of steel material market trends, which enables us to earn the trust of our customers in both structural steel products and ferrous raw materials.

  • 3Partnership; trust and a track record we have fostered with partners for many years

    We have fostered trust and accumulated strong track records with partners over many years. We have a wide variety of partners such as general contractors, developers, wholesalers, and materials processors, in addition to maintaining strong ties with steelmakers and building materials manufacturers. Strong and reliable support of cooperative partners is the essential basis for us to engage in a number of major projects in Japan, including construction of high-profile facilities, huge redevelopment projects, various infrastructure development projects, and more. Strong partnerships support the excellent track record of MM&KENZAI Corporation.

Company History


Mitsui & Co. Steel Ltd.

Metal One Structural Steel & Resource Corporation

  • Mitsui & Co. Steel Construction Material Ltd.establishedApr. 1993

  • Sep. 1994Nissho Iwai Structure Steel established

  • Apr. 2004Nissho Iwai Structural Steel and MC Metaltech are integrated and launched as Metal One Structural Steel & Resource Corporation

  • Mitsui & Co. Steel Construction Material Ltd. changes its name to Mitsui & Co. Steel Ltd.Oct. 2007

  • Mitsui & Co. Steel Ltd. is merged with the domestic Iron & Steel Products team of MITSUI & CO. LTD., Sintsuda Corporation, Mitsui & Co. Special Steel Ltd., and Mitsui & Co. Plate Processing Ltd.Apr. 2008

  • Oct. 2012Steel products for construction and ferrous raw materials businesses of Metal One Corporation’s regional companies (Metal One Hokkaido, Metal One Nishinihon, Metal One Shikoku and Metal One Kyushu) are transferred to Metal One Structural Steel & Resource Corporation

  • Ferrous raw materials business is transferred from Mitsui Bussan Metals Co., Ltd. to Mitsui & Co. Steel Ltd.Apr. 2013

  • Oct. 2013Metal One SSS West Japan, Ltd. integrated with Metal One Structural Steel & Resource Corporation

  • Nov. 2014Metal One Mitsui Bussan Resource & Structural Steel Corporation is formed

  • Nov. 2015Company name is changed to MM&KENZAI Corporation

Corporate Profile


Company Name MM&KENZAI Corporation
Head office Shiodome City Center 17/18F, 5-2 Higashi-Shimbashi 1-chome, Minato-ku, Tokyo 105-7117, Japan
Capital ¥10.375 billion
Sales ¥767.2 billion (year ended March 2019)
Representatives Chairman of the Board: Yasuo Yamamoto
President & CEO: Masaaki Miyazawa
Shareholders Metal One Corporation (50%); Mitsui & Co. Steel Ltd. (50%)
No. of employees Approx. 670 (non-consolidated); approx. 1,000 (consolidated) (as of April 2019)
Main businesses 1.Steel products for construction
Sales, processing and import/export of steel products for construction, civil engineering materials, Base Pack, system construction,
deformed bars and section steel, plus a range of civil engineering and architecture-related construction work

2. Ferrous raw materials
Domestic, import/export transactions of ferrous raw materials,
and environmental recycling business promotion

Our Business


Supporting Social Investments in Infrastructure for the Future

Structural Steel Business / Civil Engineering Business

All-around capabilities from making estimates to construction work

MM&KENZAI Corporation supplies a wide variety of structural steel products such as H beams and thick plates to our clients who include steel frame and bridge fabricators and steel tower manufacturers. We maintain close collaboration with our branch offices, sales offices, and group companies across Japan. Also, with a strong domestic network of fabricators, we are able to swiftly carry out sales and procure materials for all types of buildings. We are effective in responding to the demands of our clients, such as for construction, quality control, process control, and construction progress management by utilizing the functions of our group companies.

Supporting people’s lives through building foundations and infrastructure development

MM&KENZAI Corporation handles a wide range of products essential for building and maintaining infrastructure. These include: materials for civil engineering and building foundation work (steel pipe piles, steel pipe sheet piles, steel sheet piles, etc.); shield construction materials such as underground railways and utility tunnels (segments, FRPM pipes, etc.); road materials (guard rails, sound barriers, railings, etc.); and materials for outdoor structures (fences, gratings, etc.). We support people’s lives by supplying products needed for building foundations and infrastructure including for: foundation work for buildings and bridges; revetment work to reinforce coastlines and river embankments; tunnel excavation work; and exterior construction of commercial facilities and distribution warehouses. We are also involved in large-scale projects such as disaster prevention and recovery work and transportation infrastructure building, and our extensive capabilities, based on data and know-how accumulated through countless projects, are unique to MM&KENZAI Corporation.

Capturing Future Demand

Base Pack Business & System Construction Business / Steel Bars Business / Long Steel Products Business

Meeting the needs of customers through stable material supply and reliable construction

In addition to Base Pack—a column base product for steel frames that is a staple for us—we handle a wide range of products including: OS rings (steel frame through-hole reinforcements), antiseismic and vibration-damping components (unbond braces, B-UP braces, NS-SSB devices, Octobases), and Stan packages (pre-engineered building components). We also perform contracted construction work in addition to selling materials. Base Pack, which we sell, is characterized by outstanding earthquake resistance using an exposed column base construction method to achieve joints that meet holding strength requirements. With a record of zero collapses in the Great Hanshin Awaji Earthquake of 1995 and the Great East Japan Earthquake of 2011, the Base Pack system is used for a wide range of buildings from private homes to large-scale stores and factories, giving our business partners, residents, and users peace of mind. MM&KENZAI Corporation has a network of about 70 sales contractors throughout Japan, and contributes to a safer society by consistently supplying materials and ensuring reliable installation to meet the demands of customers.

Stable supply with industry-high volume

We primarily deal in deformed bars, which is the main material of reinforced concrete structures. We also handle threaded deformed bar, deformed bar mechanical joints, structural round bar, and semi-finished billets. Deformed bars are the most common structual steel products used in Japan. It is known for its high versatility, and is used for apartment buildings, schools, and hotels, as well as for the foundations of steel-framed high-rise buildings, distribution warehouses, and wooden houses, as well as for civil engineering projects. Deformed bars also happen to be a recycled product manufactured from ferrous scrap by electric furnace steel makers, and is eco-friendly because in the manufacturing process it emits less CO2, said to be the main cause of global warming. MM&KENZAI Corporation takes pride in handling the industry’s highest volume of deformed bars, and has achieved stable supply of deformed bars based on market/supply trends for raw materials and billets.

Meeting the diverse needs of customers through our wide range of networks

We mainly sell shaped steel products used for structures such as buildings and factories. These products, which are used in a wide range of applications, include: H beams, columns, angles, channels, flat bars, rails, light beams, and so on. We purchase these products from manufacturers and sell them to customers, mainly steel wholesalers (stock distributors). Our strength is our wide range of purchasing and sales networks, which are unique to the MM&KENZAI Corporation Group. We have offered a one-stop service for our customers by utilizing our stock, processing, and distribution bases spread throughout the country. We are always maintaining close contacts with customers in each region of the country and preparing a system to meet the diverse needs of our customers.

Preserving the Future Global Environment

Ferrous Raw Materials and Environmental Recycling Business

Selling ferrous scrap in overseas markets as one of the leading companies in the Japanese domestic scrap business field

We trade in ferrous scrap and stainless steel scrap domestically and through imports/exports. Utilizing business relations with approximately 1,000 companies across Japan, we have been able to establish an optimal raw material supply system that matches the demand of the blast furnace and electric furnace mills. We handle the largest amounts of scrap in Japan, and have been focusing in particular on exports to South Korea, Taiwan, and countries in Southeast Asia and elsewhere.

Guaranteeing Safety for the Future

Construction Contractor

Contributing to the stability of construction infrastructure development
and lifestyle-supporting infrastructure

MM&KENZAI Corporation Group has an extensive track record in steel frame construction to meet needs for buildings of all kinds, from high-rise and medium-height buildings to commercial facilities such as large shopping centers. We contribute to the stability and sturdiness of construction infrastructure and to stability in the business of building lifestyle-supporting infrastructure. Needs have been diversifying in the steel frame building industry in recent years, and those demands call for the integration and management capabilities of a trading company that includes the procurement of steel products. MM&KENZAI Corporation Group has abundant knowledge and experience that we can draw upon to meet such demands from customers, including reduced costs, quality assurance, and reliable delivery. We accomplish this by centrally managing a range of operations from the manufacturing of steel frame products to on-site construction. With safety as our top priority, we will continue to provide high quality and quick, sturdy construction.


Specific Construction Business License: Approved by the Minister of Land, Infrastructure, Transport and Tourism (Toku-27) No. 18777