The Blue Square Bet North outfit took the lead through ex-Coventry City striker Leon McKenzie before Avelino Viera extended the Steelmen's lead just before the break.
Marcel Henry-Francis struck back for Blues just after the interval but Corby's two-goal advantage was restored through Josh Moreman.
Beale's men will now kick-off their 2012/13 Professional Development League 2 North Division campaign at Sheffield Wednesday this Saturday (11.30am kick-off).
Blues Development Squad starting XI: Callum Preston, Ryan Higgins, Jack Deaman, Emmitt Delfouneso, Josh Hawker, Brice Ntambwe, Ibrahim Farah, Sanchez Payne, Deqwon Ebanks, Marcel Henry-Francis, Jake Jervis.