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U.S. Steel

AKA Mon Valley Works, United States Steel; FKA Carnegie Steel, Carnegie-Illinois Steel, multiple locations, PA


U.S. Steel is one of the largest steel manufacturers in the country.  Founded in 1901,  U.S. Steel owns several mills in the midwest and abroad.  In Pennsylvania, U.S. Steel has operated as many as 7 plants, three of which have since closed.  The remaining plants are collectively referred to as Mon Valley Works.

Address or general location

Current and former locations include Fairless Hills, McKeesport, Duquesne, Homestead, Clairton, Braddock, and West Mifflin, PA.


Founded in 1901, U.S. Steel has been a significant player in the steel industry.  See below for more information on both current and former U.S. Steel plants in Pennsylvania:

Mon Valley Works

Mon Valley Works is an integrated steelmaking operation which is comprised of four separate plants:  Fairless Works, Clairton Works, Edgar Thomson Plant, and the Irvin Plant.

Fairless Works, 400 Middle Drive, Fairless Hills, PA.  Located on a 1,600 acre site, the Fairless Works plant began operating in 1952.  Over the years, parts of the plant were closed but the galvanizing facility is still in operation.  

Clairton Works (AKA Clairton Coke Works), 400 State Street, Clairton, PA.  In operation since 1918, Clairton Works is located on 392 acres along the west bank of the Monongahela River.

Edgar Thomson Plant, 13th Street and Braddock, Avenue, Braddock, PA.  The Edgar Thomson Plant began operating in 1872 and was originally owned and operated by Carnegie Steel Company.  The Edgar Thomson Plant eventually became a part of U.S. Steel in the early 1900s.  The mill currently employs approximately 900 workers.

Irvin Plant, Camp Hollow Road, West Mifflin, PA.  Steel making operations began in 1938 and continues to the present.  The mill is located on 650 acres of land above the Monongahela Valley.

Closed U.S. Steel Facilities

McKeesport Tubular Operations (FKA National Tube Works), McKeesport, PA.  The McKeesport plant began operating in the late 1800s and became a part of U.S. Steel in 1901.  Due to economic circumstances, U.S. Steel closed the facility in 2014, resulting in the layoff of 175 workers.  Dura-Bond plans to reopen the 317,000 square foot plant in 2017.

Duquesne Steel Works, Duquesne, PA.

Duquesne Steel Works began as a Bessemer steel rail mill in the late 1800s.  Acquired by U.S. Steel in 1901, the plant continued to operate until the mill was closed in 1984.

Homestead Works, Homestead, PA.

The Homestead Works facility was constructed by Carnegie Steel Company in the late 1800s and later became a part of U.S. Steel.  At one time, the mill dominated the industry and helped make western Pennsylvania the Steel-Making Capital of the World.  The mill was closed in 1986.

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