ltd. japan steel works headquarters located in gate city ohsaki west tower type 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 products iron and steel products chemical machinery nuclear power related machinery pressure containers plastic injection machinery resin manufacturing and processing machinery hydraulic equipment revenue 2.346 billion usd fy 2012 220.65 billion jpy fy 2012 net income 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 1 2 japan steel works ltd. kabushiki kaisha nihon seik sho is a steel manufacturer founded in muroran hokkaid japan in 1907 . 3 contents 1 history 2 products 3 financial information 4 gallery 5 references 6 external links history edit 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 products edit 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 pressure vessels for nuclear reactors 4 5 at the company s factory which is located on the island of hokkaid . the other manufacturers as of 2010 are two companies in china one in russia and one in france . 6 however japan steel works is the only one that can make cores in a single piece without welds which reduces risk from radiation leakage . 7 the company has boosted production to 6 units per year from 4 previously of the steel pressure vessel forgings which contain the 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 edit 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 gallery edit 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 references edit japan steel works annual report 2013 pdf . retrieved march 14 2014 . corporate profile . retrieved march 14 2014 . a b company information official website japan steel works ltd. retrieved 2008 03 14 a b c d e takemoto yoshifumi ; katz alan 2008 03 13 bloomberg exclusive samurai sword maker s reactor monopoly may cool nuclear revival bloomberg.com retrieved 2008 03 14 kid steve 2009 03 03 new nuclear build sufficient supply capability nuclear engineering international retrieved 2011 01 17 heavy manufacturing of power plants world nuclear association december 2010 retrieved 2011 01 17 a b suga masumi ; song yasumasa 2010 06 01 japan steel to sell parts for 26 nuclear reactors businessweek retrieved 2011 01 17 a b japan steel works revises downward earnings for year to march . japan weekly monitor 2002 03 20 retrieved 2008 03 14 japan steel works ltd. 5631 stock quote & company profile businessweek businessweek retrieved 2011 01 17 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