FILE PHOTO: Workers clean up around the steel slab roller line at the Novolipetsk Steel PAO steel mill in Farrell

FILE PHOTO: Workers clean up around the steel slab roller line at the Novolipetsk Steel PAO steel mill in Farrell

FILE PHOTO: Workers clean up around the steel slab roller line at a steel mill in Farrell, Pennsylvania, U.S., March 9, 2018. REUTERS/Aaron Josefczyk/File Photo