Tobata seisakusho co.,Ltd.

We supply commercialized copper-cast tuyeres mainly made of high-strength aluminum bronze for high quality.
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We manufacture nonferrous metal products for the iron and steel, shipbuilding, and industrial machinery industries. Our products are mainly made of pure copper or copper alloy. We have also expanded our manufacturing to a magnesium alloy featuring excellent heat resistance and non-flammability. In addition, we are developing a copper alloy casting made of high-strength aluminum bronze and copper-cast tuyeres. These are used in an environment where the ambient temperature is 1,800°C or more.


  • Pure copper and copper alloy casting

    Pure copper and copper alloy casting

    [Product description] We manufacture products by casting pure copper and copper alloys. Pure copper casting has good thermal conductivity. With this merit we propose products with excellent cooling functions for blowing facilities and walls of blast furnaces, converters, and electric furnaces at iron works, which receive great thermal loads. Our long experience and unique know-how are highly appreciated in Japan and overseas. Copper alloy casting is excellent in corrosion resistance and wear resistance. Our products are widely used as facility parts in the shipbuilding and industrial machinery industries, as well as the iron and steel industry. [Market share/Ranking] Market share of tuyeres for blast furnaces: 60% share of the domestic market in Japan. [Major facilities and equipment] Three-cycle induction furnace (one dimension, two furnaces), automatic sand processing and molding equipment, Furan sand reclamation equipment, shot blast, lathe, milling machine, radial drilling machine, and DC-AC semi-automatic welder.

  • Nonflammable magnesium alloy

    Nonflammable magnesium alloy

    [Product description] Our nonflammable magnesium alloy is an epoch-making light metal alloy whose ignition temperature is greater than 900°. Since 2003 we have been manufacturing and selling ingots, billets, and other materials and cast products, and these have been enjoying good popularity. This is an environmentally friendly alloy requiring no flux or inert gas with high global warming potential (SF6). Special facilities are unnecessary and existing aluminum melting facilities can be used as they are. Our alloy enables dry processing. Chips can be recycled and are easy to handle. We support small-quantity production and test specimens.

  • Nonferrous welded boiler tanks

    Nonferrous welded boiler tanks

    [Product description] We possess product technologies for copper welding, copper and steel welding, and nonferrous metal welding. Our technologies as a welding manufacturer are highly appreciated. It was previously impossible to join metals of different kinds, but our R&D and experience since 1984 have made it possible. This is done by making use of vacuum diffusion bonding equipment. We have also installed portal machining centers and other large machines for in-house product manufacturing. This includes welding and processing large nonferrous products and making boiler tanks. [Major facilities and equipment] Diffusion bonding furnaces: 2; 300-ton hydraulic press: 1; portal machining centers: 2; machining center: 1, planing machine: 1; radial drilling machine: 1; milling machine: 1; DC-AC semi-automatic welding machines: 37; CO2 gas semi-automatic welding machines: 3; and industrial X-ray equipment: 1 set.



Tobata seisakusho co.,Ltd.



0 JPY (Yen)


0 (Number of full-time employees: 0)


February, 1948




8-21, Shinsone, Koguraminami-ku, Kitakyushu, Fukuoka, 800-0211


Manufacture of fabricated metal products


Kazuaki Matsumoto   President


[Company strength]
We supply pure copper cast products, which are manufactured by only a few companies in Japan. We deliver products to iron works as tuyeres for blast furnaces, lance nozzles for converters, and wall coolers for electronic furnaces. They are highly appreciated for their high quality. We can handle small-quantity production for prototyping and mass production, and can propose materials and manufacturing methods suitable for customer needs. Quality assurance begins from the design meeting, and we conduct inquiries after use and solicit improvement proposals to supply products that satisfy customers.

[Business description]
We manufacture and sell nonferrous metal products. In particular, we provide net copper products and copper alloy products for the iron and steel, shipbuilding, and industrial machinery industries. We have also been tackling magnesium manufacturing in recent years. Our heat-resistant nonflammable magnesium alloy has been attracting attention from various industries.

Nonferrous metal manufacturing

[Strength of products/technologies]
Our copper alloy casting is appreciated in various industries as worm wheels and so on, with the high-strength aluminum we developed being first on the list. Our copper-cast tuyeres for blast furnaces in the iron and steel industry are used under severe environments where the ambient temperature is 1,800°C or more and high quality is expected. We believe that we are leading other manufacturers in Japan in copper welding, which is said to be a difficult technology. We are sure that we can make satisfactory proposals for magnesium alloys because we handle various kinds of materials.

[Representative's message]
We have been engaged in pure copper casting and nonferrous special welding for many years. We are always committed to enhancing casting and welding technologies and to developing new products without losing our ambition. Exports were not active for several years but the recent trend of a weak yen is establishing a competitive environment. We will take this opportunity to expand our overseas sales. We aim to make our heat-resistant nonflammable magnesium alloy one of our key businesses. To accomplish this we will conduct broad-based public relations activities in the automotive field and so on, as well as the rolling stock field.

[Company structure for market development/overseas expansion]
The iron and steel industry accounts for the greatest percentage of our transactions. We sell our products mainly to major iron and steel manufacturers represented by Nippon Steel & Sumitomo Metal Corporation and JFE Steel Corporation. Our sales system is organized based on sales staff in respective areas. They are carrying out sales and follow-up activities in their assigned areas, with a commitment to quickly supporting clients, including local trading firms. We make use of trading firms in various regions for overseas activities. Our standard practice is for staff in charge of overseas activities to accompany staff from a trading firm in customer visits and to conduct public relations activities. We are hoping to increase our exports by further strengthening our systems.

[Market share/Ranking]
Copper-cast tuyeres for blast furnaces: 60% share of the domestic market in Japan.
Copper-cast lances for converters: 60% share of the domestic market in Japan.

Strategic Core Technology Advancement Program approval

[Joint research and development]
NEDO “Development of Evaluation Technology for the Manufacturing Process and Quality of Heat-Resistant Nonflammable Magnesium Alloy” (Kyushu University, AIST, etc., in 2013); Strategic Core Technology Advancement Program Project “Development of Innovative Electrode Material Using Thin Plates Cast from Nonflammable Magnesium Alloy to Implement Magnesium Air Batteries as an Emergency Power Supply” (AIST, etc., in 2013 to 2015); and many others.

[Main Clients / Business History (domestic)]
Nippon Steel & Sumitomo Metal Corporation, JFE Steel Corporation, Mitsubishi Heavy Industries Co., Ltd., IHI Corporation, and many other major iron and steel manufacturers.

[Main Clients / Business History (overseas)]
China Steel, Danieli Corus, BSL, AHMSA, and other major iron and steel companies.

[Exhibition History/Information]
Kumamoto Industrial Business Fair 2013, International Magnesium Fair 2013, IFEX 2013 India, Automotive World 2014 (scheduled), the 4th Automotive Weight Reduction Expo (scheduled).