In light of the problem of low yield of pipe for petroleum produced by Φ114mm cross roll piercing elongation(CPE)mill
an analysis on production process flow sheet has been carried out. It is obtained that hot-sawing on pipe in middle procedure and hot-cutting ends are two factors led to low yield. With adopting the improved alignment method as pipe moved to cooling bed and the pointing process
the comprehensive yield of Φ73.0 mm×5.5 mm and P88.9 mm× 6.5 mm pipes for petroleum increases to84.5%~85.0% from original 78%