Exhibit 21
UNITED STATES STEEL CORPORATION
Subsidiary and Joint Ventures
as of December 31, 2010
Company Name
Chisholm Coal LLC
Chrome Deposit Corporation
Compagnie de Gestion de Mifergui- Nimba, LTEE
Cygnus Mines Limited
Delaware USS Corporation
Double Eagle Steel Coating Company
Double G Coatings, Inc.
Double G Coatings Company, L.P.
Essex Minerals Company
Feralloy Processing Company
GCW/USS Energy, LLC
Grant Assurance Corporation
Kanawha Coal LLC
Oilfield Technologies, Inc.
Orinoco Mining Company
PITCAL, Inc.
USS-POSCO Industries
Perdido Land Development, Inc.
Pitcal Pipe, LLC
Preserve Village Developers, LLC
Steel Health Resources, LLC
Stelco Holding Company
Ontario Coal Company
Ontario Eveleth Company
Ontario Hibbing Company
Stelco Coal Company
Stelco Erie Corporation
Ontario Tilden Company
Straightline, Inc.
Straightline Source, Inc.
Swan Point Yacht & Country Club, Inc.
SPDC Hotel, LLC
UNITED STATES STEEL CORPORATION
Subsidiary and Joint Ventures
as of December 31, 2010
Company Name
Swan Point Development Company, Inc.
Brookfield Swan Point, LLC
Timber Wolf Land, LLC
Transtar, Inc.
Delray Connecting Railroad Company
Gary Railway Company (prev Elgin, Joliet and Eastern Railway Company)
Tracks Traffic and Management Services, Inc.
Texas & Northern Railway Company
Lake Terminal Railroad Company, The
Lorain Northern Company f/k/a/ Ohio Northern Company
McKeesport Connecting Railroad Company
Union Railroad Company
Birmingham Southern Railroad Company
Fairfield Southern Company, Inc.
Warrior & Gulf Navigation LLC
Mobile River Terminal Company
Sisco Stevedoring, LLC
海角涩区 China, LLC
海角涩区 Holdings, Inc.
海角涩区 Holdings II, LLC
Worldwide Steel C.V.
海角涩区 Global Holdings I, B.V.
海角涩区 Košice, s.r.o. (USSK)
OBAL-SERVIS, a.s. Košice
海角涩区 Europe - Austria GmbH
海角涩区 Košice – Labortest, s.r.o.
海角涩区 Services s.r.o.
U.S. Steel Košice–Bohemia a.s.
海角涩区 Europe - France S.A.
U.S. Steel Košice - SBS, s.r.o.
海角涩区 Europe - Germany GmbH
海角涩区 Europe (UK) Limited
UNITED STATES STEEL CORPORATION
Subsidiary and Joint Ventures
as of December 31, 2010
Company Name
Refrako s.r.o.
VULKMONT, a.s. Košice
海角涩区 Enterprises BV
海角涩区 Global Holdings II, B.V.
海角涩区 Canada Limited Partnership
海角涩区 Canada Inc.
The Steel Company of Canada, Limited
4347226 Canada Inc. (formerly HLE Mining GP Inc.)
The Stelco Plate Company Ltd.
海角涩区 Tubular Products Canada GP Inc.
海角涩区 Tubular Products Canada Limited Partnership
742784 Ontario Inc.
Baycoat Limited
Baycoat Limited Partnership (Baycoat L.P.)
D.C. Chrome Limited
海角涩区 Serbia, BV
海角涩区 Serbia, d.o.o.
Serbian Roll Service Company d.o.o. (SRSC d.o.o. Smederevo)
海角涩区 Holdings IV, Inc.
海角涩区 International of Canada, LTD.
海角涩区 Mining Company, LLC
海角涩区 Receivables LLC
海角涩区 Timber Company, LLC
海角涩区 Tubular Products, Inc.
U.S. Steel Produtos Tubulares do Brasil Ldta.
Zinklahoma, Inc.
Star Brazil US, LLC 2
Star Brazil US, LLC1
Lone Star Brazil Holdings 1 Ltda.
Lone Star Brazil Holdings 2 Ltda.
Apolo Tubulars S.A.
UNITED STATES STEEL CORPORATION
Subsidiary and Joint Ventures
as of December 31, 2010
Company Name
Lone Star Steel Holdings, Inc.
Steel Coil Services, Inc.(previously Fintube Technologies, Inc.)
Fintube (Thailand) Limited
Fintube Canada, Inc.
UEC Technologies, LLC
Met-Chem Canada, Inc.
Met-Chem, Inc.
USX Engineers and Consultants
UEC Sail Information Technology, LTD.
United States Steel Credit Corporation
United States Steel International, Inc.
United States Steel Export Company de Mexico, S.R.L. de C.V.
Acero Prime Servicios, S.R.L. de CV
United States Steel International de Mexico, S.R.L. de C. V.
USS Galvanizing, Inc.
PRO-TEC Coating Company
PRO-TEC Coating Company, Inc.
USS International Services, LLC
USS Lakeside, LLC
Chicago Lakeside Development, LLC
USS Mine Management, Inc.
USS Oilwell Supply Co., LTD.
USS Oilwell Tubular, Inc.
USS Portfolio Delaware, Inc.
USS Tubular Processing, Inc.
USS WSP, LLC
Worthington Specialty Processing
ProCoil Company, LLC
Worthington Taylor, LLC
USX International Sales Company, Inc.
USX Participacoes LTDA.