I'm actually experiencing a similar problem.
I'm a level 41 human pally with Blacksmithing at 230 as well.
I found the trainers in ironforge at the great anvil, but the weapon crafter just announces "greetings human" and the armor crafter states that he will train me, but there is no option to do so.
Is there some kind of quest or prerequisite for activating these trainers to do thier thing?