What are cold-rolled pipe and cold-drawn pipe?

What are cold-rolled pipe and cold-drawn pipe?

As an important industrial material, steel pipes are widely used in various fields. Cold-rolled pipe and cold-drawn pipe are two common types of steel pipes. Cold rolling and drawing of tube is a method of cold processing of tubes at room temperature, which belongs to the deep processing of hot-rolled tubes and welded tubes.

1.Cold rolling and drawing of tube

The cold processing of pipes by rolling and drawing at room temperature on a cold-rolled and cold-drawn pipe unit belongs to the deep processing of hot-rolled pipes (including hot-extruded pipes) and welded pipes. It can obtain pipes with smaller diameter, thinner wall thickness, higher dimensional accuracy, lower surface roughness, better performance and various cross-sectional shapes. Various pipes with diameters ranging from 0.2 to 765mm and wall thicknesses from 0.015 to 50mm can be produced using the cold drawing method. Various pipes with diameters from 4 to 450 mm and wall thicknesses from 0.03 to 35 mm can be produced by cold rolling.

2. Advantages of cold rolling and cold drawing

Compared cold drawing and cold rolling, the advantages of cold rolling are large deformation in passes, few processing passes, short production cycle and low metal consumption. And the advantages of cold drawing are higher productivity, easier specification change during production, greater flexibility, and simple manufacturing of equipment and tools.

3. What is the difference between cold rolled pipe and cold drawn pipe? 

--Production technology

First of all, from the perspective of production technology, cold-rolled pipes are processed by cold-rolling hot-rolled coils or steel plates, and are made after multiple passes of rolling, drawing, diameter expansion, diameter reduction, straightening and other processes. of pipes. Cold-drawn pipes use a cold drawing process to draw hot-rolled pipes or cold-rolled pipes in a cold drawing machine to obtain higher dimensional accuracy and surface quality. Both processes have high requirements on equipment and technology, so they can produce high-quality steel pipes.

--Physical properties

Secondly, in terms of physical properties, due to the characteristics of the cold drawing process, the surface of cold drawn pipes is smoother than cold rolled pipes, the internal structure is denser, and the surface quality is higher. At the same time, cold drawn tubes have higher dimensional accuracy, more uniform wall thickness, and better dimensional stability. This makes cold drawn tubes more widely used in fields that require higher accuracy and surface quality, such as precision instruments and hydraulic equipment. Cold-rolled pipes are widely used in construction, machinery, chemical industry and other industries due to their good physical properties and low cost.

--Material characteristics

In addition, from the perspective of material properties, cold-rolled pipes and cold-drawn pipes usually use low carbon steel or low alloy steel as raw materials. These materials have good strength, wear resistance and corrosion resistance, allowing steel pipes to meet the needs of use in various complex environments.

cold-rolled pipe vs cold-drawn pipe

There are differences between cold-rolled pipes and cold-drawn pipes in terms of production process, physical properties, application fields and material characteristics. When choosing steel pipes, youd better considering the specific use environment and needs. The cold-rolled pipes and cold-drawn pipes of Shanghai Youdao Industrial are of excellent quality. Each steel pipe meets relevant standards and requirements to meet the needs of various customers. Looking forward to your inquiry!