I believe that one reason you can't get the quest from him is that you haven't done the
Quest: The Way of the Weaponsmith. Ironus can be found in the Great Forge area of Ironforge. If you stand in front of the two guys near the big anvil, he is the one on the left (the one on the right is for amoursmithing).
I think to start the quest you actually need to talk to Myolor Sunderfury first. He stands in the middle of the great forge area near the three blacksmithing trainers.
After finishing this quest you should directed to head to Everlook. You also might want to do the other
Blacksmithing quest as well. You do get more recipes from completing those.
Hope this helps you out.