Ben Roethlisberger completed 11-of-16 passes 16, in preseason action.
Antonio Brown caught both of Roethlisberger's touchdown passes -- 77 and 44 yards. The second-year pro out of Central Michigan ended with four catches for 137 yards.
Crezdon Butler returned an interception 95 yards for a touchdown in the victory.
The news was not all good for the Steelers, who lost reserve quarterback Byron Leftwich and starting center Maurkice Pouncey. Pouncey exited with a left ankle injury, while Leftwich left with an injured left arm.
Late in the third quarter, Leftwich srambled to his right for six yards. Atlanta linebacker Stephen Nicholas took down Leftwich, who appeared to suffer a serious injury after hitting the turf awkwardly.
Roddy White hauled in eight passes for 101 yards and a touchdown in defeat.