 PITTSBURGH, July 14, 2021 PRNewswire -- Allegheny Technologies Incorporated NYSE: ATI announced its employees have ratified a new four-year labor agreement with the United Steelworkers, ending the strike that began March 30, 2021. As part of an orderly return to work process, employees will begin returning to active employment the week of July 19, 2021, with production ramping in the weeks ahead. 