The Steelers signed safety Damontae Kazee after the end of the draft on Saturday, and two more defensive backs joined the team after being exhausted.
Cornerbacks Chris Steele and Bryce Watts are among the 10 players announced as new members of the club this weekend.
Steele had 95 tackles, 12 passes defense, a fumble recovery, a forced fumble, a sack and three interceptions while making 23 starts at USC. Watts played two seasons at Virginia Tech before switching to UMass. He had 43 tackles and one interception last season.
The Steelers have also signed Duquesne tackle Jake Dixon, Duke running back Mataeo Durant, Michigan defender Donovan Jeter, Texas A&M linebacker Tyree Johnson, Auburn linebacker TD Moultry, Alabama guard Chris Owens, North Carolina tackle Jordan Tucker and Oklahoma State running back Jaylen Warren.