Technological option production of drill steel and especially thick-walled pipes

摘要

The basic disadvantages of the known modern production technology of thick-walled pipes and drill steel. A new method of producing profiles for drill rods. Hollow billet is formed by crystallization on hollow steel water-cooled mold. Profile is produced by compression using conical mandrels. The relation between the axial position of the mandrel and the internal diameter of the profile.