Importance of degreasing polishing process for stainless steel sanitary pipe

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Importance of degreasing polishing process for stainless steel sanitary pipe

2020-06-19 H:19:22

 After rolling, the stainless steel sanitary pipe should be oiled, then it should be air dried before subsequent treatment.

1. One is to pour the degreaser directly into the pool, then soak it with water, then clean it directly after 12 hours.

2. Another cleaning process is to put the stainless steel sanitary pipe into diesel oil, soak it for 6 hours, then put it into the pool together with the detergent. After soaking for 6 hours, clean.

The process has obvious advantages, cleaning stainless steel sanitary pipe is relatively clean.

If the degreasing is very clean, the effect on the subsequent polishing process vacuum annealing process is very obvious. If degreasing is clean, first of all, polishing is difficult to clean cannot be polished.

After bright, the product is easy to peel off, which can guarantee high quality products.

The straightness of stainless steel precision pipe needs straightening

Bright appearance, smooth inner hole:

The internal external surface roughness of precision rolled stainless steel pipe is RA ≤ 0.8 μ M

The surface roughness of polished tube can reach RA ≤ 0.4 μ m (such as mirror surface)

Generally speaking, the main equipment for rough polishing of stainless steel pipe is polishing head, because the roughness of the polishing head determines the order of rough polishing.

Classification of stainless steel pipe: AP, MP, Ba, EP, AP

AP: acid pickling, the oxidation layer of steel pipe is removed by acid solution such as nitric acid fluoric acid. However, it is easy to cause grain boundary corrosion. Moreover, the inner outer surfaces are rough easy to attach suspended impurities.

MP: mechanical polishing, usually used for oxide layer, hole scratch on steel pipe surface. Its brightness effect depend on the type of processing method. In addition, after mechanical polishing, although it is more beautiful, it will also reduce the corrosion resistance, so it needs to be passivated again when used in corrosive environment. Moreover, polishing material is often left on the surface of steel pipe

Ba: bright annealing. In the process of drawing, the steel pipe will definitely need grease lubrication, the grains will be deformed due to processing. In order to avoid this kind of grease remaining in the steel pipe, in addition to cleaning the steel pipe, high temperature annealing can be carried out at high temperature to eliminate deformation, argon gas is used as furnace atmosphere for combustion. The carbon oxygen on the steel pipe surface are further purified by argon. The surface has a bright surface effect, so this method of annealing heating pure argon is called bright annealing, which makes the surface bright. Although the surface is brightened by this method, the steel pipe can still be kept clean enough. Any foreign pollution. However, if the brightness of this surface is compared with other polishing methods (mechanical, chemical, electrolytic), there will be a feeling of fogging. Of course, the effect is also related to argon content heating times.

EP: electro polishing. Anodic treatment is used in electropolishing. Through the principle of electrochemistry, proper adjustment of voltage, current, acid composition polishing time can only make the surface smooth smooth, but also improve the cleaning effect corrosion resistance of the surface. Therefore, the method of brightening the surface also increases the cost technology. However, electrolytic polishing will highlight the original state of the steel pipe surface, so if there are serious scratches, holes slag, precipitates on the surface of the steel pipe, it may lead to electrolytic failure. It is different chemical polishing in that although it is also carried out in acid environment, there will be no grain boundary corrosion on the surface of steel pipe, the corrosion resistance of steel pipe can be realized by controlling the thickness of chromium. Surface oxide film.