What is the difference between cold drawn tube and cold drawing tube?

The so-called cold drawn tube is to draw the metal with a cold drawing machine without heating. The advantage is that it does not need to be carried out at high temperature. The disadvantage is that the residual stress is large and cannot be drawn too long. Cold drawn process can improve toughness and resistance. The tensile strength obtains better mechanical properties. Cold drawn (rolled) seamless steel pipe process: round tube billet → heating → perforation → heading → annealing → pickling → oiling (copper plating) → multi-pass cold drawing (cold rolling) → billet → heat treatment → straightening → Hydraulic test (flaw detection) → Marking → Storage.

The difference between cold drawn tube and cold drawing tube: Cold drawn process and cold drawing process are two different methods of metal cold working. Cold drawing process refers to the method of applying tensile force at both ends of a metal material to cause tensile deformation of the material; cold drawn process refers to the method of applying a pulling force at one end of the material to pull the material through a die hole, the diameter of the die is relatively The diameter of the material is smaller. The cold drawing process causes the material to have extrusion deformation in addition to the tensile deformation. The cold drawn process is generally carried out on a special cold drawing machine. The cold drawn material has better performance than the cold drawing material.