Is the inside of the stainless steel pipe polished?
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The inner surface of the stainless steel pipe feels as if it has been polished; why do steel pipe manufacturers do this? What is the purpose?
It is common for the inside of stainless steel pipes to be ground. Grinding the inner diameter of the steel pipe ensures the flatness, precision, and smoothness of the pipe wall, thereby improving the pipeline’s service life and flow capacity. In certain application scenarios, defects such as protrusions, burrs, and weld slag on the inner wall of pipes can lead to poor fluidity in the piping system, and may pose certain risks to industrial production. Therefore, internal grinding is a very important step in the manufacturing process of stainless steel pipes. -
After this grinding process, should acid cleaning and passivation be done again? There should be requirements regarding the roughness after grinding, right? Our measurement showed over 7 um, which makes it seem like it was shipped straight after grinding
After grinding inside the stainless steel pipe, pickling and passivation are usually carried out. Pickling can remove oxides from the surface of pipes, while passivation creates a dense passive film that enhances the corrosion resistance of stainless steel pipes. These treatment measures help to improve the service life and quality of pipelines. The roughness standard after internal grinding of the pipeline depends on the specific application requirements, and it generally must comply with relevant industry standards and specifications. For example, the internal roughness of stainless steel pipes used in food engineering is generally required to be around 0.4 microns; moreover, different pipe applications have varying requirements regarding roughness. Therefore, you can consult steel pipe manufacturers or third-party testing institutions to determine whether the internal roughness of the pipes meets the standard requirements, in order to ensure product quality. -
Learned something new:lol:lol:lol:lol:lol:lol
This is not grinding. We have encountered it too. It’s Wujin, right? During the hot rolling process, impurities such as scale remain inside and cannot be removed. Mechanical cleaning is required. The person who was called.
This is a case-specific situation regarding the handling of substandard steel pipe products; after grinding, they pass the inspection and are considered qualified products.
It’s quite similar to inner-polishing pipe treatment: lol