Exhibit 21

UNITED STATES STEEL CORPORATION

Subsidiary and Joint Ventures

2012 Form 10-K

 

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.

  


UNITED STATES STEEL CORPORATION

Subsidiary and Joint Ventures

2012 Form 10-K

 

Swan Point Yacht & Country Club, Inc.

  

SPDC Hotel, LLC

  

Swan Point Development Company, Inc.

  

Brookfield Swan Point, LLC

  

Timber Wolf Land, LLC

  

Transtar, Inc.

  

Delray Connecting Railroad Company

  

Gary 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

  

Sisco Stevedoring, LLC

  

U. S. Steel China, LLC

  

U. S. Steel Holdings, Inc.

  

U. S. Steel Holdings II, LLC

  

Worldwide Steel C.V.

  

U. S. Steel Global Holdings I B.V.

  

U. S. Steel Košice, s.r.o. (USSK)

  

OBAL-SERVIS, a.s. Košice

  

U. S. Steel Europe (UK) Limited

  

U. S. Steel Košice – Labortest, s.r.o.

  

U. S. Steel Services s.r.o.

  

U. S. Steel Europe - Bohemia a.s.

  

U. S. Steel Europe - France S.A.

  

U. S. Steel Košice - SBS, s.r.o.

  


UNITED STATES STEEL CORPORATION

Subsidiary and Joint Ventures

2012 Form 10-K

 

U. S. Steel Europe - Germany GmbH

  

U. S. Steel Europe - Italy S.r.l.

  

RMS, a.s. Košice

  

U. S. Steel Enterprises BV

  

U. S. Steel Global Holdings II, B.V.

  

U. S. Steel Canada Limited Partnership

  

U. S. Steel Canada Inc.

  

The Steel Company of Canada, Limited

  

4347226 Canada Inc.

  

The Stelco Plate Company Ltd.

  

U. S. Steel Tubular Products Canada GP Inc.

  

U. S. Steel Tubular Products Canada Limited Partnership

  

742784 Ontario Inc.

  

Baycoat Limited

  

Baycoat Limited Partnership (Baycoat L.P.)

  

D.C. Chrome Limited

  

U. S. Steel Serbia, BV

  

U. S. Steel Holdings IV, Inc.

  

U. S. Steel International of Canada, LTD.

  

U. S. Steel Mining Company, LLC

  

U. S. Steel Receivables LLC

  

U. S. Steel Timber Company, LLC

  

U. S. Steel Tubular Products, Inc.

  

Patriot Premium Threading Services, LLC

  

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

2012 Form 10-K

 

Lone Star Steel Holdings, Inc.

  

Lone Star Steel Holdings II, Inc.

  

Fintube (Thailand) Limited

  

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.