Al, this questions would do better if possed in the CATIA products forum. Futhermore, I think you might find that this problem might be more complex than a pin in a hole. You are going to have plastic deformation with the amount of press fit in those two materials. I am not familiar with that particular program but before you start you will want to make sure it can solve non-linear problems.
If you are new to FEA in general, you might want to work with someone experienced in correctly setting up the model and more importantly interpreting the results.
Reguards