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  3. THE JAPAN STEEL WORKS、LTD Material and engineering products business
Machine elements and parts
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THE JAPAN STEEL WORKS、LTD Material and engineering products business

number of employees1450
addressTokyo/Shinagawa/1-11-1 Osaki
phone03-5745-2056
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last updated:Jun 26, 2026
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  • Products/Services(18)
  • catalog(24)
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THE JAPAN STEEL WORKS、LTD Company Overview

Aiming for stable growth companies through "manufacturing" and "value creation."

Our company was established as a business subsidiary on April 1, 2020, through the integration of the material and energy business of Japan Steel Works, Ltd. and the wind turbine maintenance service business, along with four group companies. Our Muroran Works is the birthplace of Japan Steel Works and has been involved in the development and manufacturing of pressure vessels and various industrial machinery, large cast and forged products, thick plates, and clad steel plates, which are essential equipment or major components used in social infrastructure and various plants for over a hundred years. In response to the advanced and diversified needs for materials, we provide various components (M: Materials), including steel, non-ferrous metals, and composite materials. Leveraging our technology and experience, we offer a one-stop solution that encompasses design, manufacturing, construction, installation, maintenance inspection, analysis evaluation, and repair, enabled by our engineering (E: Engineering) capabilities to meet our customers' wide-ranging needs.

Business Activities

Manufacturing and sales of various cast and forged steel products, steel plates, steel pipes, and steel structures; manufacturing, processing, and sales of new materials, various metal materials, and metal products; design, construction, and repair of various plants; various non-destructive testing and welding processing; monitoring, maintenance inspection, and repair of various devices and equipment.

Recommended information

Introduction to Steel Products / Ultra-Thick Carbon Steel Plates (Including Technical Data)

Introduction to Steel Products / Ultra-Thick Carbon Steel Plates (Including Technical Data)

It is possible to manufacture ultra-thick carbon steel. This time, we will introduce the manufacturing data for ultra-thick steel plates of ASME SA516 Gr.70 with a thickness of 200mm.

One of our strengths is our ability to handle extremely thick steel plates exceeding 200mm, even from a single piece. Generally, we ensure a rolling ratio of 3 or more for steel plates, but this time we have compiled data for the case of a rolling ratio of 2, specifically for a steel plate of 200mm thickness made from ASME SA516 Gr.70.

Products/Services (18)

Special clad steel plate combining stainless steel and nickel-nickel based alloy. product image
Special clad steel plate combining stainless steel and nickel-nickel based alloy.
Special clad steel plate combining stainless steel and nickel-nickel based alloy. product image
Special clad steel plate combining stainless steel and nickel-nickel based alloy.
Introduction to Steel Products / Ultra-Thick Carbon Steel Plates (Including Technical Data) product image
Introduction to Steel Products / Ultra-Thick Carbon Steel Plates (Including Technical Data)
Ultra-large mold material - Compatible with Gigacast - product image
Ultra-large mold material - Compatible with Gigacast -

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catalog(24)

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JAPAN STEEL WORKS,LTD Muroran Works Brochure

JAPAN STEEL WORKS,LTD Muroran Works Brochure

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200mm thick carbon steel plate sample test data

200mm thick carbon steel plate sample test data

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Ultra-large mold material - Compatible with Gigacast -

Ultra-large mold material - Compatible with Gigacast -

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(Appendix) Thick Plate Products - Overview

(Appendix) Thick Plate Products - Overview

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news(1)

About the merger with Japan Steel Works, Ltd.

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We would like to inform you that Nippon Steel Corporation (President: Toshio Matsuo, Headquarters: Shinagawa, Tokyo) and its wholly-owned subsidiary, Nippon Steel M&E Corporation (President: Kanade Ueda, Headquarters: Muroran, Hokkaido), have concluded a merger agreement at the board meetings of both companies held today (January 19, 2026) to absorb Nippon Steel M&E Corporation into Nippon Steel Corporation effective April 1, 2026.

Mar 19, 2026

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Detailed information

Company name THE JAPAN STEEL WORKS、LTD Material and engineering products business
number of employees1450
Contact addresspostalcode 141-0032 Tokyo/ Shinagawa/ 1-11-1 OsakiView on map TEL:03-5745-2056 FAX:03-5745-2063
Business LocationsClick here for the list
Industry Machine elements and parts
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