Differences between Cold Drawing and Cold Rolling Processes for Precision Steel Tube

Cold drawing precision tube is elongating the metal without heating with cold drawing machine. The advantages are that it does not require high temperatures, but it may result in residual stresses. Also it is important to not elongate the tube excessively. Cold drawing can improve toughness and tensile strength, offering the better mechanical properties.

The process for cold drawing (or cold rolling) of fine seamless steel tubes is as follows: round billet → heating → piercing → heading → annealing → acid pickling → oil coating (copper plating) → multiple cold drawing (cold rolling) passes → billet tube → heat treatment → straightening → hydrostatic testing (non-destructive testing) → marking → warehousing.

The difference between cold drawing and cold rolling technology:

Cold drawing refers to the method of applying tension at both ends of the metal material to make the material stretch and deform;

Cold drawing refers to the method of applying a pulling force on one end of the material to make the material pull out through a mold hole. The hole diameter of the mold is smaller than the diameter of the material.

The cold drawing process causes the material to have kneading deformation in addition to stretching deformation, and it's usually carried out on a special cold drawing machine. Cold-drawn materials perform better than cold-drawn materials.