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The American Rolling Mill Company was founded on December 2, 1899 by a group of investors led by George M. Verity in Trenton, New Jersey. Its industry was metal products and its headquarters were in Middletown, Ohio (1900-1985), Parsippany, New Jersey (1985-1993), Pittsburgh, Pennsylvania (1993-1995) and back to Middletown from 1995 to 1999. In 1978, the company changed its name to Armco, Inc. to reflect its non-steel operations it had acquired and its steel mills were placed in a newly-formed group called the Eastern Steel Division.

In 1989, the company entered into a partnership with the Kawasaki Steel Corporation allowing use of several of its production facilities to Armco in exchange for a large stake in the company. The Armco Steel Company L.P. (later known as AK Steel Holding Corporation) was formed as a result of the merger, and it acquired Armco Inc. in 1999.


  • American Rolling Mill Company (1910-1948)
  • Armco Steel Corporation (1948-1978)
  • Armco, Inc. (1978-1999)


  • Columbus, Ohio
  • Middletown, Ohio
  • Zanesville, Ohio


  • "Armco" Ingot Iron
  • "Armco Paintgrip" Sheets
  • Polygon Pipe