Exhibit 99.1

MRC Global Announces Third Quarter 2020

Earnings Release and Conference Call Schedule

HOUSTON, TX – September 3, 2020 – MRC Global Inc. (NYSE: MRC) will release its third quarter 2020 results on October 28, 2020 after the market closes. In conjunction with the release, the Company will host a conference call, which will be webcast, on Thursday, October 29, 2020 at 10:00 a.m. Eastern / 9:00 a.m. Central.

A replay will be available through November 12, 2020 by dialing 201-612-7415 using passcode 13709094#. An archive of the webcast will be available shortly after the call at www.mrcglobal.com for 90 days.

About MRC Global Inc.

MRC Global is the largest distributor of pipe, valves and fittings (PVF) and other infrastructure products and services to the energy industry, based on sales. Through approximately 240 service locations worldwide, approximately 2,850 employees and with nearly 100 years of history, MRC Global provides innovative supply chain solutions and technical product expertise to customers globally across diversified end-markets including the upstream production, midstream pipeline, gas utility and downstream and industrial. MRC Global manages a complex network of over 200,000 SKUs and 10,000 suppliers simplifying the supply chain for its over 13,000 customers. With a focus on technical products, value-added services, a global network of valve and engineering centers and an unmatched quality assurance program, MRC Global is the trusted PVF expert. Find out more at www.mrcglobal.com.

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