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 Jeffrey P. Bennett, 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 April 28, 2014, 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