Polishing Production Method of Seamless Pipe

When polishing a batch of seamless pipes in large quantities, generally the quality of each product workpiece should be the same, but sometimes the quality of stainless steel plate product workpieces polished in the same tank is different. Some are brighter, some are shiny, and some are not. The main thing to consider is the total number of polished seamless steel pipe product workpieces. Although electropolishing machines and equipment can be polished in large quantities, the total number of steel plate products polished in the same tank will affect the polishing effect. The advantage of using it is that the distribution of current cannot be uniform.

Once the current distribution during polishing is uneven, some parts of the seamless pipe will be dull. Therefore, when polishing, the appropriate total number of product workpieces should be selected according to the size of the polishing tank. Secondly, it is also necessary to consider whether the workpieces are stacked together during polishing, resulting in some positions not being polished. Therefore, in addition to controlling the total number of polished product workpieces, it is also necessary to effectively place stainless steel plate product workpieces to ensure that product workpieces do not accumulate. In addition to the above two reasons, there are water droplets, vegetable oil and other stains on the surface of seamless steel pipes, which will also affect the polishing effect.

The actual operators who use electrolytic polishing machines and equipment must be familiar with the application methods and actual operation methods to ensure the quality of polished products and workpieces. The reason for the production and processing defects of seamless steel pipes: seamless steel pipes will cause external effect defects such as the unchanged texture of the raw material lattice and the increase of surface roughness, which will cause martensite changes and pearlite melting. For example, austenitic steels show increased magnetization after cold drawing. Precision steel pipes lead to changes in the texture or lattice constant of the material surface, which will become the starting site of corrosion such as pitting corrosion.

Taking seamless steel pipes as an example, when the guaranteed deformation level is reduced by 20%, the negative information will be affected immediately. After the seamless steel pipe is cold drawn, thermal stress will be left in the raw material, and the thermal stress is not very effective on the resistance to intergranular corrosion and cracking of the raw material. Cold-drawn steel pipes at all levels will make the SCC susceptibility of cold-drawn steel pipe materials soar. The grade of cold drawing also has a negative effect on the high temperature long-term tensile strength of the cold drawn steel pipe. Generally, the higher the working temperature of the seamless steel pipe or the higher the service life requirement for cracking, the lower the allowable cold drawing grade.

Go here to learn more about " Non-destructive Testing Method for Seamless Steel Pipes"