Theoretic Research on Correction Model for Reduction Rate Distribution for Stretch Reducing Process of Seamless Steel Tube

Although properly distributing the reduction rate of the stretch-reducing process for seamless steel tube acts as a critical step for reasonable pass distribution of the pipe mill，the distribution still replies on the empirical formula. From the perspective of metal flow，the law of the reduction rate distribution is analyzed. And based on relevant experiences，a“3 point-2 section integration mode”correction model for reduction rate is set up. The result as obtained from the model is compared with that from calculation via the conventional model and relevant production data from related works， which leads to such a conclusion that the variation trends of the two are similar，and the change curvature of the reduction rate and the reduction amount are smoother than before，which means applying the model to the actual operation will bring about better metal flow.