AK Steel Holding Corporation is a steelmaking company headquartered in West Chester Township, Butler County
Severstal (Russian: Северсталь, 'Northern Steel') is a Russian company mainly operating in the steel and mining industry, headquartered in Cherepovets.
In 2014, Severstal divested its steelmaking operations in the US, selling the former rouge steel plant in Dearborn, Michigan to AK for $700 million, and its mini-mill in Columbus to Steel Dynamics for $1.63 Billion.
Kawasaki Steel Corporation (Kawasaki Seitetsu) was a Japanese steel manufacturing company.The company was renamed AK Steel Holding in 1993 when it became publicly traded.
Major industrial employers in the first half of the 20th century included Armco, Ashland Oil and refining company, the C&O Railroad, Allied Chemical & Dye company's.