Introduction of 5 kinds of processing technology for 304 stainless steel inner surface
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Introduction of 5 kinds of processing technology on the inner surface of 304 stainless steel tube 1. Acid pickling: commonly known as AP tube
An acidic solution such as nitric acid and hydrofluoric acid is used to remove a thick oxide layer on the surface of the stainless steel tube. Although it is cheap and fast, it is easy to cause grain boundary corrosion, and the inner and outer surfaces of the steel pipe are rough, and it is easy to have suspended impurities attached.
2, mechanical polishing (Mechanical Polishing): fake BA tube
It is often used to remove oxide layers, holes and scratches on the surface of stainless steel tubes. The brightness and effect depend on the type of processing. In addition, although it is more beautiful after mechanical polishing, it also reduces the corrosion resistance, so when used in a corrosive environment, it needs to be passivated. Moreover, the surface of the stainless steel tube is often left with a polishing material.
3, chemical polishing (polishing): fake BA tube
Chemical polishing is a simpler and cheaper high-surface wide-band blend of suitable mixed acids (organic acids such as nitric acid, sulfuric acid, phosphoric acid, acid, etc.), and you effectively make the stainless steel tube surface evenly produce a smooth and bright appearance. Although the acid solution is not subjected to this method such as pickling or chemical cleaning methods, such as strong, there may be intergranular corrosion (intergranular corrosion) or intergranular corrosion (grain boundary corrosion), and the stainless steel tube may be destroyed. Surface oxide layer, so semi-standard does not recommend the use of such materials in the semiconductor industry.
4, Bright Annealing: BA tube (real)
The process of the stainless steel tube pump system requires lubrication, and the grain will be deformed due to processing. In order to avoid the residual oil in the stainless steel tube, in addition to carefully cleaning the stainless steel tube, you can use the high temperature annealing in 100% hydrogen deformation to eliminate the furnace atmosphere, burning the surface of the mountain stainless steel tube combined with carbon, hydrogen and oxygen, and further clean the stainless steel tube surface, The surface is bright, so the bright stainless steel tube surface is bright annealed using the heating and rapid cooling rates of a pure oxygen and hydrogen annealing furnace. Although this way to illuminate the surface, the stainless steel tube can be kept fully dry and float without any external contamination. But the surface brightness, compared with other methods (mechanical, chemical, electrolysis), will have more fog feeling. Of course, the amount and content of the effect and the heating of the hydrogen, the absolute impact on the grain size.
5, Electro Polishing (Electro Polishing): EP tube
Electropolishing is the use of anode treatment (dissolved corrosion), through the electrochemical principle, adjust the voltage, current, acid composition, temperature and polishing time, not only can make the surface smooth, bright, clean color effect, improve the surface corrosion resistance So it is the best way of course, the cost of the lighting surface is also the highest. However, since the electropolishing will highlight the surface of the stainless steel tube in the original state, the microstructure of the metal becomes fine, and the environmental protection effect is good. So if there are severe scratches on the surface of the stainless steel tube, holes or slag, precipitation, may cause malfunction of the electrolysis. Unlike chemical polishing, although it is also in an acidic environment, there must be no grain boundary corrosion on the surface of the stainless steel tube.
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