pipe making machine 1.billet dia. 60-230mm 2.billet length 2- ... of no need pickling, phosphoroused and saponification, low investment , high precision of finished tube, short of processes, heat one time ... with restricted mandrel--three roller twelve-stander sizing M-C machine assembly--large and small cooling bed--seven-roller vertical ... 14.8×5.134.4×14.8×5.1 seamless steel pipe making machine