What is the difference between sanitary stainless steel precision tube and stainless steel ordinary tube?
1. Dimensional accuracy of stainless steel pipes
The fundamental difference between sanitary stainless steel precision tubes and ordinary tubes lies in their precision. Ordinary stainless steel pipes are commonly used in decorative and industrial applications. The pipe diameter tolerance is small, and the pipe diameter tolerance accuracy is generally greater than ±0.1mm. Precision stainless steel pipes pay more attention to the requirements of pipe diameter tolerance, which are generally controlled within ±0.05mm. Due to its high precision, it can be applied in more fields than decoration and industry, such as machinery, aviation, electronics and electronics, automobiles, etc.
2. Surface treatment of stainless steel pipes
The surface treatment of sanitary stainless steel precision pipe is stricter than that of ordinary stainless steel pipe. The surface of the precision stainless steel pipe has the following requirements: the surface of the pipe body is free of scratches and scars; the wall thickness is uniform and smooth, the nozzle is complete and free of burrs; the inner wall should be flat, and there should be no leaking sand holes at the weld. In general, the surface of ordinary pipes is rough and needs to be treated twice. The appearance is better than that of ordinary stainless steel pipes.
3. The performance of stainless steel pipe
The common material of ordinary stainless steel pipe is generally 201. If there is a small amount of requirements, 304316l is rarely used. The commonly used materials for sanitary stainless steel precision tubes are generally 304 and 316L, which are more prominent than ordinary stainless steel tubes in terms of material properties. Before the precision stainless steel pipe leaves the factory, it needs to carry out a number of mechanical performance tests, such as hardness test, bending test, compressive strength test, etc. The later machining performance is often better than that of ordinary pipes.
What surface treatments can the sanitary stainless steel precision tube be subjected to?
1. Remove oxide skin
Oxide scale refers to a layer of black hard material formed on the surface of stainless steel pipes after welding or high temperature treatment during the forming process. Precision stainless steel tube will handle surface oxide skin. The general treatment method is mechanical polishing or pickling passivation. Mechanical polishing is a simple and quick way to physically treat surface oxidation, but it can affect the accuracy of the tube. Pickling passivation uses chemical properties to deal with surface oxidation problems, which has little effect on the precision of precision stainless steel tubes. Not only does it fix oxidation problems, but it also removes other stains from the surface. This is a typical surface oxidation treatment
2. Polishing
Stainless steel pipes generally use 304 and 316L high-quality raw materials. The surface of the raw material has a brightness of 600 meshes. With the improvement of people’s requirements for the surface of stainless steel pipes, surface polishing is divided into bright and mirror polishing. According to customer requirements, we can use mechanical polishing, chemical polishing, electrochemical polishing and other methods to achieve the bright surface level required for various surfaces. Also, to give the pipe a better visual effect, the surface can be slowly polished to achieve a textured effect on the surface, which is called brushing. Drawing generally has the following types: straight drawing, round drawing, snowflake drawing, nylon drawing, etc.
3. Coloring process
The original coloring process of stainless steel pipes is generally painting, spraying and electroplating. However, the traditional coloring process has a certain impact on the environment, and the traditional coloring process has a certain impact on the accuracy of the stainless steel tube.
Therefore, the sanitary stainless steel precision tube generally adopts nano-spraying technology and vacuum plating technology. These two coloring processes not only have less impact on the environment, but also do not affect the precision of the stainless steel tube. The surface coloring process of stainless steel pipe can not only make it have a variety of colors, but also improve the wear resistance and corrosion resistance of precision stainless steel pipe.
