How much do you know about the properties of 316L stainless steel pipe?

[guidebook] : 316L stainless steel welded pipe is a material used more in wet and corrosive environments (such as the sea), and is widely used in petroleum, chemical, medical, food, light industry, mechanical instrumentation and other industrial transportation pipelines, as well as mechanical structural components. The reason is that the welded 316L stainless steel pipe has strong corrosion resistance. Why does welded 316L stainless steel pipe have high corrosion resistance?

316L stainless steel welded pipe is a material used more in wet and corrosive environments (such as the sea), and is widely used in petroleum, chemical, medical, food, light industry, mechanical instrumentation and other industrial transportation pipelines, as well as mechanical structural components. The reason is that the welded 316L stainless steel pipe has strong corrosion resistance. Why does welded 316L stainless steel pipe have high corrosion resistance?

Stainless steel will also rust under specific conditions, although 316L stainless steel has natural resistance to atmospheric oxidation, that is, no rust characteristics, but also in the environment containing acids, alkalis, salts and so on, that is, corrosion resistance.316L stainless steel corrosion resistance varies with the chemical composition, the mutual state, the working conditions and the environmental media.

For example, in a dry, clean atmosphere, the corrosion resistance of 304 stainless steel is absolutely good, but once in the coastal areas, due to the concentration of smog, it is easy to rust, but 316 stainless steel is better. Therefore, stainless steel is not resistant to corrosion and rust in any environment.

The surface of 304 stainless steel light bar has a layer of extremely thin but strong and dense stable chromium-rich oxide film (protective film), which can prevent oxygen atoms from penetrating and oxidizing the substrate, which is also the origin of its anti-corrosion properties. But for some reasons, the film will continue to be damaged, the oxygen atoms in the air or liquid will continue to separate, resulting in loose iron oxide, stainless steel surface rust.

The surface layer of 316L stainless steel tubing will also react with oxygen, but because of its high chromium content, plus the key to the corrosion resistance of 316L stainless steel tubing is the chromium content. When the percentage of chromium content of 316L stainless steel is more than 10.5%, the corrosion resistance of 316L stainless steel will be greatly improved.

When the proportion of chromium content of 316L stainless steel exceeds 10.5%, the corrosion resistance of 316L stainless steel will be greatly improved. When researching alloying stainless steel companies with chromium, the type of oxide film that occurs on the surface of the stainless steel material is changed to one similar to the surface oxide film formed on pure chromium metal. This oxide film can better protect the surface of stainless steel to prevent further oxidation.

This through the oxide film is very thin, we teachers can choose to see through it the original natural luster of the surface of the stainless steel material, so that the stainless steel tube has a surface. In addition, if the surface layer is damaged, is damaged and exposed stainless steel surface will be and the atmospheric environment development, chromium will automatically provide help stainless steel material surface can be analyzed self-protection repair, so that the stainless steel surface needs to restart the formation of passivation film, continue to escort the stainless steel.

All stainless steel tubes have a common characteristic, that is, chromium content are above 10.5%. There are usually only six steel grades associated with building construction applications. They all contain 17 to 22% chromium, basically the steel also contains nickel. 316L stainless steel industrial welded pipe with molybdenum can further improve the atmospheric corrosion, especially resistant to corrosion of chloride-containing atmospheres, which is 316L stainless steel industrial welded pipe can be corrosion-resistant.