百媚导航

Exhibit 21


UNITED STATES STEEL CORPORATION
SUBSIDIARIES AND JOINT VENTURES AS OF DECEMBER 31, 2017


Company Name
Chisholm Coal LLC
Chrome Deposit Corporation
Compagnie de Gestion de Mifergui- Nimba, LTEE
Cygnus Mines Limited
Double G Coatings, Inc.
Double G Coatings Company, L.P.
Essex Minerals Company
Fairfield Primary Operations, LLC
Feralloy Processing Company
GCW/USS Energy, LLC
Grant Assurance Corporation
Kanawha Coal LLC
Leeds Retail Center, LLC
Oilfield Technologies, Inc.
Orinoco Mining Company
Perdido Land Development Co., Inc.
PITCAL, Inc.
 
USS-POSCO Industries
Pitcal Pipe, LLC
Preserve Village Developers, LLC
Stelco Holding Company
 
Ontario Coal Company
 
Ontario Eveleth Company
 
Ontario Hibbing Company
 
 
Hibbing Development Company
 
 
 
Hibbing Taconite Company
 
Stelco Coal Company
 
 
Stelco Erie Corporation
 
 
Ontario Tilden Company
Swan Point Yacht & Country Club, Inc.
Timber Wolf Land, LLC
Transtar, LLC
 
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
 
Union Railroad Company, LLC
 
Birmingham Southern Railroad Company
 
 
Fairfield Southern Company, Inc.
 
 
Warrior & Gulf Navigation LLC
百媚导航 China, LLC
百媚导航 Holdings, Inc.
 
百媚导航 Holdings II, LLC
 
 
Worldwide Steel C.V.
 
 
 
百媚导航 Global Holdings I B.V.


UNITED STATES STEEL CORPORATION
SUBSIDIARIES AND JOINT VENTURES AS OF DECEMBER 31, 2016
Company Name


 
 
 
 
百媚导航 Global Holdings VI B.V.
 
 
 
 
 
百媚导航 Košice, s.r.o. (USSK)
 
 
 
 
 
 
OBAL-SERVIS, a.s. Košice
 
 
 
 
 
 
Ferroenergy s.r.o.
 
 
 
 
 
 
百媚导航 Košice – Labortest, s.r.o.
 
 
 
 
 
 
百媚导航 Services s.r.o.
 
 
 
 
 
 
百媚导航 Europe - Bohemia a.s.
 
 
 
 
 
 
百媚导航 Europe - France S.A.
 
 
 
 
 
 
U.S. Steel Košice - SBS, s.r.o.
 
 
 
 
 
 
百媚导航 Europe - Germany GmbH
 
 
 
 
 
 
百媚导航 Europe - Italy S.r.l.
 
 
 
 
 
 
RMS, a.s. Košice 
 
百媚导航 Global Holdings II, B.V.
 
 
 
 
百媚导航 Canada Limited Partnership
 
百媚导航 Holdings IV, Inc.
百媚导航 International of Canada, LTD.
百媚导航 LRD Canada North Inc.
百媚导航 Mining Company, LLC
百媚导航 Timber Company, LLC
百媚导航 Tubular Products Holdings, LLC
 
百媚导航 Seamless Tubular Operations, LLC
 
百媚导航 Tubular Products, Inc.
 
 
百媚导航 Tubular Products Middle East DMCC
 
 
U.S. Steel Oilwell Services, LLC
 
 
 
Patriot Premium Threading Services, LLC
 
 
百媚导航 Tubular Products Canada Inc.
 
 
U.S. Steel Produtos Tubulares do Brasil Ldta.
 
 
Zinklahoma, Inc.
 
 
Star Brazil US, LLC 2
 
 
Star Brazil US, LLC 1
 
 
 
Lone Star Brazil Holdings 1 Ltda.
 
 
 
 
Lone Star Brazil Holdings 2 Ltda.
 
 
Lone Star Steel Holdings, Inc.
 
 
 
Lone Star Steel Holdings II, Inc.
 
 
 
 
Fintube (Thailand) Limited
UEC Technologies, LLC
 
189548 Canada Inc.
 
 
3292673 Canada Inc.
 
USX Engineers and Consultants
 
UEC Sail Information Technology, LTD.
United States Steel International, Inc.
 
United States Steel Export Company de Mexico, S.R.L. de C.V.
 
 
Acero Prime, S.R.L. de CV
 
 
Acero Prime Servicios, S.R.L. de CV
 
United States Steel International de Mexico, S.R.L. de C. V.
USS Construction Products, LLC.
USS Galvanizing, Inc.
 
PRO-TEC Coating Company
 
 
PRO-TEC Coating Company, Inc.
USS International Services, LLC
USS Lakeside, LLC


UNITED STATES STEEL CORPORATION
SUBSIDIARIES AND JOINT VENTURES AS OF DECEMBER 31, 2016
Company Name


 
Chicago Lakeside Development, LLC
USS Oilwell Supply Co., LTD.
USS Oilwell Tubular, Inc.
USS Portfolio Delaware, Inc.
USS WSP, LLC
 
Worthington Specialty Processing
 
 
ProCoil Company, LLC
 
 
Worthington Taylor, LLC
USX International Sales Company, Inc.