Cold Drawn Cylinder Pipe

Cold Drawn Cylinder Pipe Definition

Cold drawn process is that we draw big diameter pipe into smaller one. And the finished pipe is called cold drawn pipe. In contrast to cold drawn pipe, it is hot expanded pipe, whose production process is to expand small diameter pipe into bigger one. Steel grade for cold drawn pipes can be carbon, alloy and stainless steel.

Our company has two 15 ton drawing machines, and can produce cold drawn steel pipe 9000Tons annually. Cold drawn steel pipe  Production Range
OD:38mm~400mm                      WT: 3.5mm~40mm
Standard and Steel Grade
Technical standards related to material: GB/T699, GB/T3077, EN10210, EN10297.
Standards for seamless pipe applicable technical : GB/T8162, Q/OHAD032.
Precise cold drawn pipes technique have been widely used in production of Coal mine single hydraulic prop cylinder and hydraulic cylinder of engineering plant. Because previous machining on cylinder is not only time-consuming and laborious, but also a waste of materials and energy. Therefore, in recent years, domestic research and application of high-precision cold drawn steel pipe starts, and its products get spread and application in coal mine and engineering plant industry nationally.

Cold Drawn Cylinder Pipe Parameter

Mechanical Properties of Cold Drawn Steel Pipe
Steel Grade Tensile Strength (MPa) Yield Strength (MPa) Elongation (%) Absorbed-energy (J)
  Not Less Than
20 410 245 25
45 600 355 16 20℃(AKV2) 39
Q345B 470~630 345 20 20℃(AKV2) 34
Q345D 470~630 345 21 -20℃(AKV2) 34
25Mn 490 295 22 20℃(AKU2) 71
E355 490~650 355 21 -20℃(AKV2) 27
27SiMn 980 835 12 20℃(AKU2) 39
E470 / 20MnV6 650 470 17 -20℃(AKV2) 27

Cold Drawn Cylinder Pipe Image


1What is the difference between cold-drawn oil cylinder pipe and cold rolling cylinder pipe?
First of all, the processing equipment and technology of the two kinds of pipes are different. Finishing tubes are rolled by a multi-roll mill, and cold-drawn tubes are generally drawn by a chain-type drawing machine or a hydraulic drawing machine. Generally, fine-rolled pipes are thin and small in size, while cold-drawn pipes can be included from large to small in size, and the range of wall thickness is also large.
2What are the characteristics of oil cylinder pipe?
The residual compressive stress on the surface layer of oil cylinder pipe is helpful to seal the tiny cracks on the surface and hinder the expansion of erosion. Thereby improving the surface corrosion resistance and delaying the generation or expansion of fatigue cracks. Through rolling forming, a layer of cold work hardening layer is formed on the rolling surface, which reduces the elastic and plastic deformation of the contact surface of the grinding pair, thus improving the wear resistance of the inner wall of the steel pipe and avoiding burning caused by grinding.
After rolling, the reduction of surface roughness can improve the matching properties. Rolling is a kind of chip-free machining, which makes use of the plastic deformation of metal at normal temperature to flatten the micro-roughness of the workpiece surface, so as to change the surface structure, mechanical characteristics, shape and size. Therefore, this method can achieve two purposes of finishing and strengthening at the same time, which can not be achieved by grinding
31.How to do well the maintenance and maintenance of hydraulic cylinder pipe?
Good maintenance and maintenance can prolong the service life of equipment. Let's introduce the maintenance of hydraulic cylinder pipe. Because the hydraulic cylinder pipe bears great pressure, the heavier the load, the greater its pressure will be.
Therefore, the maintenance of the hydraulic cylinder pipe is the most important part of the maintenance of the whole hydraulic system. The hydraulic cylinder pipe is equivalent to the heart of the hydraulic system, and it is difficult to repair the problems in the heart, so the maintenance of the hydraulic cylinder pipe should be careful and meticulous. First of all, to prevent rust. Because the piston part of the hydraulic cylinder pipe extends out of the cylinder in the working state, it will naturally be eroded by oxide and acid gas, which requires us to coat it with proper amount of grease for protection, so as to avoid the piston as a load-bearing component being eroded and possibly broken in the work.
Second, open the box and change the oil. Because it is used for a long time, it is inevitable that foreign matter will enter the hydraulic cylinder pipe, so that the friction will increase in use. In addition, the hydraulic oil has a certain service life, and long-term oil change will damage or erode the inside of the hydraulic cylinder pipe. Prevention is better than cure, so the speed should be controlled properly in the work of hydraulic cylinder pipe, not exceeding 2m/s, which can prolong the service life of hydraulic cylinder pipe. In addition, in order to protect the mechanism and be safe, the internal buffer device is very effective for the protection of hydraulic cylinder pipe.