I'm not sure what to make of this, but according to Schefter, the Steelers made an effort to get Jake Long.
Most of the remaining guys on the tackle market appear to be RTs, so I'm not sure if the Steelers would make a play for one of these guys (with Adams/Gilbert to compete at LT) or if their interest was just in an elite LT like Long. Here is the list:
Adam Schefter @AdamSchefter
Just before OT Jake Long agreed to a four-year deal worth up to $36 million with Rams, Steelers made a play to try to get him to Pittsburgh.
If Schefter's report is true, then perhaps the Steelers reported interest in Dumervil is legit.