US Steel - Southworks

FORMER MILL NAMES
North Chicago Rolling Mill (1880)
Illinois Steel (1889)
Carnegie Steel (1892)
US Steel Corporation (1901)
Carnegie Illinois Steel (subsidiary of US) (1936)
USX Corporation (1986)
 

Iroquois

FORMER MILL NAMES
Iroquois Iron (1890)
Steel and Tube Company of America (1916)
Youngstown Sheet and Tube (1923)
 

Wisconsin Steel

FORMER MILL NAMES
Joseph H. Brown Iron & Steel (1875)
Calumet Iron and Steel (1882)
South Chicago Furnace Company (1899)
Deering Harvester Company (1900)
Wisconsin Steel Works (International Harvester) (1905)
Wisconsin Steel Works (Envirodyne) (1977)
 

Acme/Interlake

FORMER MILL NAMES
By-products Coke corporation (1905)
Federal Furnace (1905)
By Products Coke & Federal Furnace Merge (1915)
Interlake Iron (1929)
Interlake Steel (1929)
Acme Steel (1986)
ISG (2002)
ArcelorMittal (2002)
Cleveland Cliffs (2020)
 

Republic Steel

FORMER MILL NAMES
Grand Crossing Tack Company (1883)
Interstate Iron and Steel Company (1916)
Republic Steel (1930)
LTV (1984)
Republic Engineered Steel (1989)
 

Youngstown Steel

FORMER MILL NAMES
Sheet and Tube (1918)
Youngstown Sheet and Tube (1923)
Jones and Laughlin (1978)
LTV (1984)
ISG (2002)
Mittal Steel (2005)
Arcelor Mittal - Indiana Harbor West (2006)
Cleveland Cliffs (2020) to present
 

Inland Steel

FORMER MILL NAMES
Inland Steel (1902)
Ispat (1998)
Mittal Steel (2005)
Arcelor Mittal - Indiana Harbor East (2007)
Cleveland Cliffs (2020) to present
 

US Steel - Gary Works

FORMER MILL NAMES
1906 to present
(same ownership but temporarily renamed USX 1986-2001)
2025 Nippon Steel (Japan)
 

Burns Harbor

FORMER MILL NAMES
Bethlehem Steel (1962)
ISG (2003)
Mittal Steel (2006)
Arcelor Mittal (2007)
Cleveland Cliffs (2020) to present