What kind of powers does Iron Man have?

Tony Stark himself has no Superpowers. Yes he is an intelligent man especially in engineering. However his Iron Man "suits" have repulsor rays, all sorts of sensory equipment and Jet boosters. Each suit has been designed for different situations eg, he has a suit for under water exploration and another for space travel. However in saying this the suits are constantly up graded on a regular basics. Just to add Tony no longer needs the suits chest plate to keep him alive.

Without his armor Tony Stark possesses the normal strength of a normal human man his age, height, and build who engages in moderate regular exercise. The various armors magnify Stark's strength to superhuman levels, enabling him to lift (press) from roughly several tons to 175 tons.

Originally, the armor converted electrical energy into raw strength through miniaturized, transistor-based electro-motors. After the development of sufficiently advanced electromagnetic force-fields, however, these became the means of providing strength as well as structural integrity. This more "organic", integrated approach proved very successful, and the Iron Man-armor is quite probably the most powerful individual armor in the world today.