The extruding technology for theφ48×6mm seamless thick walled tube,design of the extruding die and the application measure in production are briefly stated.

This article studies the ring die's high temperature wear-resistance in the process of manufacturing the heavy caliber thick-wall seamless steel pipe.

The article Introduces the different of tolerances on dimensions,mechanical properties,surface quality of that between the new and last issue in Aluminium alloy extruded tubes-part 1:seamless tubes and Aluminium and aluminium alloy cold drawn(rolled) seamless tubes,and gives instruction of how technical requirement are determined the problems that will appear on alternate period.