LIMITED POWER OF ATTORNEY
The undersigned, being an executive officer or director of MRC Global
Inc. (the "Corporation"), who will thereby be subject to the reporting
obligations of Section 16 of the Securities Exchange Act of 1934, as amended
(the "Act"), with respect to securities of the Corporation, hereby constitutes
and appoints each of Brian K. Shore and Daniel J. Churay as the undersigned's
true and lawful attorneys-in-fact and agents to execute and file for and on
behalf of the undersigned Forms 3, 4, and 5 with the Securities and Exchange
Commission, and to perform all acts necessary in order to execute and file such
Forms 3, 4, and 5, as he or she, as applicable, shall deem appropriate. The
undersigned hereby ratifies and confirms all that said attorneys-in-fact and
agents shall do or cause to be done by virtue hereof.
This Limited Power of Attorney shall remain in full force and effect
until the undersigned is no longer required to file Forms 3, 4, and 5 with
respect to the undersigned's holdings of and transactions in securities issued
by the Corporation, unless earlier revoked by the undersigned in a signed
writing delivered to the foregoing attorneys-in-fact.
This Limited Power of Attorney is executed as of April 9, 2012.
/s/ Andrew R. Lane /s/ James E. Braun
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Andrew R. Lane James E. Braun
/s/ Daniel J. Churay /s/ Gary A. Ittner
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Daniel J. Churay Gary A. Ittner
/s/ James F. Underhill /s/ Leonard M. Anthony
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James F. Underhill Leonard M. Anthony
/s/ Rhys J. Best /s/ Peter C. Boylan III
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Rhys J. Best Peter C. Boylan III
/s/ Craig Ketchum /s/ Gerard P. Krans
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Craig Ketchum Gerard P. Krans
/s/ Cornelis A. Linse /s/ John A. Perkins
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Dr. Cornelis A. Linse John A. Perkins
/s/ H.B. Wehrle, III /s/ Elton R. Bond
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H.B. Wehrle, III Elton R. Bond
/s/ Neil P. Wagstaff /s/ Scott A. Hutchinson
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Neil P. Wagstaff Scott A. Hutchinson
/s/ Rory M. Isaac
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Rory M. Isaac