The team is reportedly hosting draft prospect Lache Seastrunk at some point (dates weren't confirmed), and although Seastrunk fell short of his 2013 prediction of winning the Heisman Trophy, he put together an excellent career - 2,189 yards and 18 touchdowns in two seasons.
He has excellent core strength and great acceleration. NFL Films' Greg Cosell said Seastrunk would fit in well with a team that uses running backs as receivers often - which the Steelers did in 2013 and look to do in the future.
Where he'd be expected to be drafted is up for some debate. He blew scouts away with an 11-foot-2 broad jump at the NFL Scouting Combine (6th longest since 2006), and put up a strong 4.51 40-yard dash time. Considering his explosion and lower body strength, the top end speed isn't quite as important. His career 7.6 yards per carry mark on 289 collegiate carries, it's obvious he can make plays with the ball in his hands.
To what end the Steelers select a running back in this draft could be determined by what they do in free agency - or vice versa. There are several good running backs still available, and a draft pick would be cheaper financially, but perhaps more expensive in terms of depth-building. It's possible the team could spend a middle-tier pick on a player like Seastrunk (although he may not make it past the third round, where the Steelers do not currently have a pick, but are expected to receive one in the distribution of compensatory selections), but perhaps signing a veteran as well as bringing along a player like Seastrunk is the best option.