ÁñÁ«ÊÓƵ

Subsidiary

State or Country
of Incorporation

Adela Investment Company S.A.

Chrome Deposit Corporation

Clairton 1314B Partnership, L.P.

Compagnie de Gestion de Mifergui-Nimba, LTEE.

Cygnus Mines Limited

Delaware ÁñÁ«ÊÓƵ Corporation

Delray Connecting Railroad

Double Eagle Steel Coating Company

Double G Coatings, Inc.

Double G Coatings Company, L.P.

Essex Minerals Company (Societe des Mineraux Essex)

Farms Sewer Company, Inc.

Farms Water Company, Inc.

Feralloy Processing Co.

Grant Assurance Corporation

La Pointe Iron Company

New Deal Development, Inc.

New King Court Development Associates, LLC

Oilfield Technologies, Inc.

Olympic Laser Processing

Orinoco Mining Company

Pasadena Yacht and Country Club, Inc.

Perdido Land Development Co., Inc.

Phil Prop, Inc.

PITCAL, Inc.

ÁñÁ«ÊÓƵ-POSCO Industries

ProCoil Company, LLC

Smart Screen Systems, Inc.

Societe Des mines de Fer de Guinee Pour L’Exploitation Des Monts Nimba (Mifergui Nimba)

Steel Health Resources, LLC

Straightline Source, Inc.

Straightline, Inc.

Swan Point Yacht & Country Club, Inc.

Transtar, Inc.

Birmingham Southern Railroad Company

Elgin, Joliet and Eastern Railway Company

Fairfield Southern Company, Inc.

Lake Terminal Railroad Company, The

McKeesport Connecting Railroad Company

Tracks Traffic and Management Services, Inc.

Union Railroad Company

Warrior & Gulf Navigation Company

Mobile River Terminal Company

Sisco Stevedoring, LLC

The Southern International Services Company, Inc.

The Southern International Services Company II, Inc.

Transtar Logistics, LLC

EX-IM Logistics, LLC

U. S. Steel China, LLC

U. S. Steel International of Canada, LTD.

U. S. Steel Mining Company, LLC

ÁñÁ«ÊÓƵ Mine Management, Inc.

United States Steel International, Inc.

Compania de Representaciones Mercantiles, Cubacero, S.A.

United States Steel Export Company de Mexico, S.R.L. de C.V.

Acero Prime, S.R.L. de C.V.

Acero Prime Servicios, S.R.L. de C.V.

United States Steel International de Mexico, S.R.L. de C.V.

U. S. Steel Receivables, LLC

U. S. Steel Timber Company, LLC

ÁñÁ«ÊÓƵ Coal Sales, LLC

ÁñÁ«ÊÓƵ Galvanizing, Inc.

PRO-TEC Coating Company

PRO-TEC Coating Company, Inc.

ÁñÁ«ÊÓƵ International Services, LLC

ÁñÁ«ÊÓƵ Oilwell Supply Co., LTD.

ÁñÁ«ÊÓƵ Oilwell Tubular, Inc.

ÁñÁ«ÊÓƵ Portfolio Delaware, Inc.

ÁñÁ«ÊÓƵ Tubular Processing, Inc.

U. S. Steel Holdings, Inc.

ÁñÁ«ÊÓƵ Global Holdings I B.V.

U. S. Steel Kosice (ÁñÁ«ÊÓƵK)

Elektroservis VN a VVN a.s. Kosice

Energoservis a.s. Kosice

Hutnictvi zeleza (Czech Republic)

International Trade Center a.s.

U. S. Steel Kosice Belgium

NV Promet SA (Belgium)

U. S. Steel Kosice Bohemia a.s.

U. S Steel Kosice France S.A.

U. S. Steel Hungary kft

U. S. Steel Kosice SBS, s.r.o.

U. S. Steel Kosice Germany GmbH

SZ Stahl GmbH (Germany)

Waltzwerke Finow GmbH

Betrieber Gesellschaft Nordbahn GmbH

Stawa Stahlbau GmbH

Vozmult a.s. Kosice

Refrako, s.r.o.

Trgovinsko Preduzece, ÁñÁ«ÊÓƵKS d.o.o.

Reliningserv, s.r.o.

VSZ (U.K.) Ltd. (United Kingdom)

Vulkmont a.s. Kosice

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

U. S. Steel Serbia, B.V.

Sartid, a.d.

Sartid Beli Limovi, a.d.

Luka Smedervo d.o.o.

Veljko Dugosevic d.o.o. Kucevo

Spin d.o.o.

Slobodna Zona Smederevo

Stara Zelezara d.o.o. Smederevo

U. S. Steel Balkan, d.o.o.

U. S. Steel Enterprises, B.V.

U. S. Steel Europe, B.V.

U. S. Steel Holdings III, Inc.

United States Steel Credit Corporation

UEC Technologies, LLC

Met-Chem Canada Inc.

UEC Sail Information Technology, LTD.

USX Engineers and Consultants, Inc.

USX International Sales Company, Inc.

USX Participacoes LTDA.

Merinds Mineracao

Mineracao Carajas, LTDA.

Mineracao Maraba, LTDA.

USX RTI Holdings, Inc.

Republic Technologies International Holdings LLC

Republic Technologies International LLC

Worthington Specialty Processing