Steyn was helped by two generous lbw decisions from English umpire Mark Benson, who adjudged Lou Vincent and Stephen Fleming out despite evidence to the contrary.
Mark Burchill opened the scoring within four minutes of the restart, and Vincent Pericard and Svetoslav Todorov put the game beyond reach with two late goals.
Geovanni showed true Brazilian flair with an aerial volley that flew narrowly over the crossbar but he pulled Hull level on the hour mark when his free-kick found the net after a deflection off Vincent Kompany.
Fleming reached his personal milestone on 14, the first New Zealander to hit the 6, 000 mark, and after surviving a confident lbw appeal from Streak, he kept Vincent company throughout the morning.