Shinhokoku Steel Corporation



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Responding Customer Needs with Developing Special Alloy.

Workd Ieading manufacture of Low Thermal Expansion Alloy.

President and CEOTadashi Naruse

We appreciate your kind and continuous support for our company.

We started our business since 1949 at Kawagoe-shi, Saitama-ken as manufacturing of special steel.
We have developed on new alloy material to respond with our customer needs. As a proposal oriented special steel manufacturer, we believe we could make contribution to support Japanese basic industries.

As January 1, 2017, we have merged our 100% owned Shinhokoku Steel Mie Corporation and combine development, manufacturing and sales together, aiming for our further growth.

One of our main product is alloy with Zero and Low thermal expansion cast and forged alloy (Invariable alloy). Extremely low thermal expansion alloy (High young’s modulus zero expansion super invar) is used for the core parts of semiconductor, FPD and organic EL panel making equipment which require nano level dimensional control. Also low thermal expansion alloy is used for lapping plate which need to achieve submicron flatness by precise polishing for large area of their various kind of wafer.
Low thermal expansion alloys are developed which can adjust CTE from zero to every 1ppm and also with corrosion resistance, machinability and rigidity, cope with various customers needs. Through this development, we have many kind of low thermal expansion materials and will be pleased to offer most suitable material to our customer based on their needs.

Our 2nd main product is heat resistance steel and abrasion resistant steel. This special steel is used for piercing plug of high-end world class seamless pipe which is used for oil and natural gas drilling and developed by our collaboration with Japanese major steel makers . We are supplying our special steel to most of Japanese seamless pipe steel makers.
Accumulated technologies through our activities are also applied to upper process of iron mill, glass wool makers and bio mass boiler makers etc. With every suitable assortment which can not be realized by general materials. We would like to be more problem solving and proposal oriented sales activities to our customers.

The base of our company as a proposal oriented alloy maker feature is made as we have our own productive R&D division.
50kgs high frequency furnace, heat treatment furnaces, SEM(Scanning Electron Microscope) are equipped in our R&D, these have been contributed to our new alloy development, joint development with our customers and also collaboration with outside institute or university to develop new alloys and high functionality of existing alloys. Our many researchers are trying their best for these activities in daily basis.

Based on our R&D activities, backed up with thorough craftsmanship main production is made at our Mie plant. We have 3t, 2t, 1t, 700kgs, 500kgs and 100kgs high frequency furnaces and totally 4t molten metal product can be made at our Mie plant.
Slag refining technology which has been cultivated in long years so that no follower allow and also accumulated casting method and adding to these, casting simulation is now available which made us possible further up grading of our quality, shorter lead time and also cost reduction. By utilizing neighbor such as marching, surface treatment as our cooperative companies with tight collaboration, we could establish position of comprehensive metal manufacturer.

Headquarters in Saitama, has R&D, Sales, Administration and Material Fabrication Divisions. Based on R&D development result, Material Fabrication Division utilize domestic and overseas net-work cultivated in many years through our technical guidance for various Zero and Low thermal expansion cast and forged alloy (Invariable alloy), special rolling stocks, wire drawing material, special cast iron, small roll for steel pipe production, tin plate for sapphire substrate polishing, cupper plate and titanium rod by centerless grinding machining.

Based on our core strength of special steel, we will try our best to comply with our customer’s needs even in niche area of entire metallic material as a professional in this field.

January 1, 2017



Headquarters : 5-13-1 Arajuku-machi, Kawagoe, Saitama, Japan,
Tel +81-49-242-1950
Mie plant
835-1 Takamatsu,Kawagoe-cho, Mie-gun, Mie, Japan
Tel +81-59-363-2313

For our product information For metal and alloy information please kindly contact to us.