LIMITED POWER OF ATTORNEY

The undersigned, each being a 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, with full power of substitution or
revocation, each of Daniel J. Churay and Ann D. Garnett, or such
attorney-in-fact?s substitute or substitutes, as the undersigned?s
true and lawful attorneys-in-fact and agents to execute and file for
and on behalf of the undersigned Forms 4 and 5 with the Securities
and Exchange Commission (the ?SEC?), and to perform all acts necessary
in order to execute and file such Forms 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, or such
attorney-in-fact?s substitute or substitutes, shall do or cause to be
done by virtue hereof.

The undersigned acknowledges that the foregoing attorneys-in-fact,
in serving in such capacity at the request of the undersigned, or
such attorney-in-fact?s substitute or substitutes, are not assuming,
nor is the Corporation assuming, any of the undersigned?s
responsibilities to comply with Section 16 of the Act.  This Limited
Power of Attorney shall remain in full force and effect until the
undersigned is no longer required to file Forms 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 effective as of February 17, 2015,
and any previous power of attorney issued by the undersigned for the
purpose of executing and filing Forms 4 and 5 with the SEC with respect
to holdings of and transactions in securities issued by the Corporation
is hereby revoked (without affecting the effectiveness of any such power
of attorney prior to the date hereof).


/s/ Leonard M. Anthony			/s/ Rhys J. Best
Leonard M. Anthony			Rhys J. Best


/s/ Peter C. Boylan III			/s/ Henry Cornell
Peter C. Boylan III			Henry Cornell


/s/ Craig Ketchum			/s/ Gerard P. Krans
Craig Ketchum				Gerard P. Krans


/s/ Dr. Cornelis A. Linse		/s/ John A. Perkins
Dr. Cornelis A. Linse			John A. Perkins


/s/ H.B. Wehrle, III
H.B. Wehrle, III