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AK Steel Holding Corporation is an American steel company whose predecessor, Armco, was founded in 1899 in Middletown, Ohio, United States. In 2007, the company moved its corporate headquarters from Middletown to West Chester, Ohio.〔(【引用サイトリンク】title=AK Steel Holding, Form 8-K, Current Report, Filing Date Feb 20, 2007 )〕〔(【引用サイトリンク】title=AK Steel Holding, Form 10-K, Annual Report, Filing Date Feb 26, 2008 )〕 The company derives its name from the first letters of "Armco" and "Kawasaki Steel Corporation," which entered into a limited partnership with Armco in 1989. The company was formally renamed AK Steel in 1993 when it became a publicly traded company. ==History== The company was founded in 1899 as The American Rolling Mill Company (which is the basis for the eventual ARMCO name) in Middletown, Ohio, and operated the Middletown Works there. In 1901 it opened the Ashland Works in Ashland, Kentucky. In 1948 it adopted the ARMCO name which in turn became Armco Steel Corporation.〔 The Middletown, Ashland, and at least Zanesville, Ohio, and Butler, Penna.,were the company's only plants until the 1950s when it began buying more mills and diversifying.〔 Armco had more patience than any other steel company during the 1960s.In the later 1960s Armco upgraded and added production facilities which included a new Middletown Works hot strip rolling facility that required a building, the worlds first, so massive the curvature of the Earth had to be factored in its design. During the late 1970s and 1980s corporate finances and business declined, as with much of the US steel industry, and Armco faced a number of pollution and obselescence/international competition issues, which resulted in a general decline of workforce size and profitability and closure of a number of older facilities. In 1978 it was renamed Armco, Inc. and it moved its headquarters for a now diversified company to New Jersey in 1985. In 1989 it entered into a limited partnership with Kawasaki Steel Corporation as well as with Itochu Corporation owning 50 percent of its Nova Steel Processing unit.〔 In 1993 the company moved its headquarters to Pittsburgh, Pennsylvania and renamed itself AK Steel Holdings reflecting its Armco roots and sizable investment by Kawasaki. The company became publically traded in 1993. In 1995 it moved its headquarters back to Middletown.〔 In 2007 it moved its headquarters to West Chester Township, Butler County, Ohio. In 2008 it became a component of S&P500. AK Steel was listed #1 on the Mother Jones Top 20 polluters of 2010; dumping over 12,000 tons of toxic chemicals into Ohio waterways.〔http://motherjones.com/blue-marble/2012/03/top-10-polluted-rivers-waterways〕 On July 21, 2014, AK Steel Holding announced that it had agreed to purchase Russia-based steelmaker OAO Severstal's Dearborn, Michigan steel-making assets for $700 million cash. The acquisition would also include a coke-making facility and interests in three joint ventures that process flat-rolled steel products.〔http://www.aksteel.com/news/press_release.aspx?doc_id=1062&year=2014〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「AK Steel Holding」の詳細全文を読む スポンサード リンク
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