An employee was using a 6-foot pry bar to move a bent piece of pipe (4.5" .290 wall) that would not roll down the starwheel discharge ramp. As the employee pulled on the pry bar, which was partially inserted into the pipe, the bar slipped and caught the his right ring fingertip and part of his pinky finger between the pry bar and a post supporting a pass-line chain. He was hospitalized.