EE was attempting to move a Drisco Pipe 6"" Dia X 22'8"" in Length with steel flanges on both ends. Steel flange on pipe caught on floor, from a steel block measuring 6""x6"" square and sticking up 1/4"" that had been welded over a bin hole in screen house. EE jerked on pipe to free up, pipe came loose and rolled into a steel support beam, striking L hand between beam and pipe.