The tempering of cold drawn seamless steel pipe reheats the quenched Wuxi cold drawn seamless steel pipe to a certain temperature, and then uses a certain method to cool it is called tempering. Cold drawn seamless steel pipes have the characteristics of no oxide layer on the inner and outer walls, no leakage under high pressure, high precision, high finish, no deformation of cold bending, no cracks in flaring and flattening, and anti-rust treatment on the surface. They are mainly used for mechanical structures, Hydraulic equipment and pneumatic or hydraulic components of automobiles and motorcycles, such as cylinders or oil cylinders. If you choose ordinary steel pipes, there will be a big error in the model of the steel pipe you ordered and the steel pipe you received. Even in different parts of a steel pipe, there will be a big difference in the inner diameter or the wall thickness. Such a pipeline will definitely bring many problems in the process of use. However, cold drawn seamless steel pipes are different. This steel pipe has strict requirements on the standards of any part of the pipe. Although cold-drawn seamless steel pipes are equally impossible, the dimensions of every aspect of the pipes fully comply with this standard. However, cold drawn seamless steel pipes can control the error within a small range. In general, this error will not exceed two standard units, which is sufficient for most industries.
The production method of cold drawn seamless steel pipes mainly depends on mandrel drawing to change the outer diameter and thickness of cold drawn steel pipes.
1. Drawing without mandrel (only use drawing die without mandrel when drawing).
2. Short mandrel drawing (using a pipe drawing die and a short mandrel with a small axial fixed length when drawing).
3. Long mandrel drawing (when drawing, use a pipe drawing die and a long mandrel that moves with the drawn steel pipe and is slightly longer than the length of the pipe).
4. Floating mandrel drawing (a short mandrel that can be stably held in the deformation zone without axial fixation using a pipe drawing die when drawing).
Generally, the production process of cold-drawn seamless steel pipes can be divided into two types: cold-drawn and hot-rolled. The production process of cold-rolled seamless steel pipes is generally more complicated than that of hot rolling. After pressing, a sizing test should be carried out. If the surface does not respond to cracks, the tube should be cut by a cutting machine and cut into a blank of about one meter in length.
Then enter the annealing process, the annealing should be pickled with acidic liquid. When pickling, pay attention to whether there is a lot of blistering on the surface. If there is a lot of blistering, it means that the quality of the steel pipe does not meet the corresponding standards.
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