The Pittsburgh Post-Gazette's Ed Bouchette tweeted that DeCastro signed a four-year deal with a fifth-year option.
The no. 24 pick overall was seen as the best interior offensive lineman prospect in the draft and the best one to come along in years. DeCastro will more than likely slide right into one of the guard spots - most likely Doug Legursky's left guard spot - and start right away for the Steelers on what is shaping up to be an imposing line in front of quarterback Ben Roethlisberger.
DeCastro gave up only one sack during his entire college career and his intense demeanor should fit right into a Steelers' culture of professionalism, grit and passion.
Oh, and he'll help keep Roethlisberger off his backside, which is always a good thing if you're a Steelers fan.
To discuss DeCastro with Stanford football fans, check out Rule of Tree.