Japan Steel Works

Japan Steel Works

The Japan Steel Works, Ltd.
Public KK
Traded as TYO: 5631
OSE: 5631
NAG: 5631
FSE: 5631
Nikkei 225 Component
Industry Industrial machinery
Founded November 1, 1907
Headquarters Gate City Ohsaki-West Tower, 11-1, Osaki 1-chome, Shinagawa-ku, Tokyo 141-0032, Japan
Key people
Ikuo Sato, (CEO and President)

$ 2.346 billion USD (FY 2012)

(¥ 220.65 billion JPY) (FY 2012)

$ 88.04 million USD (FY 2012)

(¥ 8.28 billion JPY) (FY 2012)
Number of employees
4,804 (consolidated) (as of March 2013)
Subsidiaries 31
Website Official website
Footnotes / references

Japan Steel Works, Ltd. (株式会社日本製鋼所 Kabushiki Kaisha Nihon Seikōsho) is a steel manufacturer founded in Muroran, Hokkaidō, Japan in 1907.[3]


  • History 1
  • Products 2
  • Financial information 3
  • Gallery 4
  • References 5
  • External links 6


Japan Steel Works was set up with investment from British firms Vickers, Armstrong Whitworth and Mitsui.[3] During World War II, they manufactured what was then the world's largest gun barrel to be fitted on the battleship Yamato. 200 workers in their main plant in Muroran were killed in a 1945 attack by Allied Forces.[4]


Japan Steel Works' industrial processes which are used to purify steel are held to high standards. These include the use of argon gas to eliminate impurities, and the addition of manganese, chromium and nickel to make the steel harder.[4]

Japan Steel Works' services are in great demand owing to its role as one of only five manufacturers worldwide of large single-piece nuclear reactor core. It is scheduled to take capacity to 11 by 2013.[7] Due to the production bottleneck, utilities across the world are submitting orders years in advance of any actual need, along with deposits worth hundreds of millions of dollars. Other manufacturers are examining various options, including finding ways to make a similar item using alternate methods, or making the component themselves with welds.[4] However, welds are weak points which can result in reactor leakage.

Other items manufactured by Japan Steel Works include machines for processed plastics.[8] They also continue to make a limited number of traditional Japanese swords.[4] They are also involved in the development of the Type 10 battle tank, Type 99 155 mm self-propelled howitzer and Naval artillery.

Financial information

In fiscal year 2001, Japan Steel Works posted a net loss of ¥1.81 billion on sales of ¥119.70 billion. Their performance improved in 2002, with net profit of ¥100 million on sales of ¥129 billion; however, this was far short of their earlier estimate of ¥600 million net profit on sales of ¥134 billion.[8]

Japan Steel Works Ltd. increased net profit to ¥12.6 billion for the nine months to December 31, 2007. Revenue was up to ¥159.2 billion. Operating profit increased to ¥21.9 billion and ordinary profit rose to ¥21.2 billion. Full-year revenue forecast is unchanged at ¥ 218 billion to March 31, 2008. The company maintained a full-year net profit forecast of ¥15 billion.[9]


Cmdr. Dan Dusek, commanding officer of USS Fitzgerald (DDG 62), exchanges business cards with Muroran Mayor Masashi Shingu during a reception held in the Japanese Steel Works reception hall. 
Type 10 tank 120 mm L44 smoothbore cannon developed by Japan Steel Works 
FH-70 Towed Howitzer built under license by Japan Steel Works for the JGSDF 


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External links

  • Official Website (English)