Cold drawing and cold drawing are two different methods of metal cold working, and the two are not the same concept.
Cold drawing refers to the method of applying tensile force on both ends of a metal material to cause tensile deformation of the material;
Cold drawing refers to a method of applying a pulling force at one end of the material to pull the material out through a die hole. The diameter of the die should be smaller than the diameter of the material. In addition to the tensile deformation, the cold-drawing process causes the material to have extrusion deformation. The cold-drawing process is generally carried out on a special cold-drawing machine. Cold drawn materials perform better than cold drawn materials.
Precision drawing cold-drawn seamless steel pipe is to use a cold-drawing machine to lengthen the metal pipe without heating. The advantage is that it does not need to be carried out at high temperature. Toughness and tensile strength give better mechanical properties.
The process of cold drawn seamless steel pipe: round tube blank → heating → perforation → heading → annealing → pickling → multi-pass cold drawing → semi-finished pipe → heat treatment → straightening → hydraulic test (flaw detection) → marking → storage.
The main use of cold drawn seamless steel pipe: for automobiles, motorcycles, refrigeration equipment, hydraulic parts, pneumatic cylinders, and other customers who have high requirements for steel pipe accuracy, smoothness, cleanliness, and mechanical properties.
