Product Name：DIN PN Threaded Flange
The screw flange is a non-welding flange, which is made of the inner hole of the flange into pipe threads and connected with the pipe with screw thread.
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The stainless steel flange is not completely rust-proof, but its oxidation resistance is stronger than that of ordinary steel, so it is called stainless steel.
Stainless steel not only has the ability to resist atmospheric oxidation, but also has the ability to corrode in acid, alkali, and salt media. However, the size of its corrosion resistance varies with the chemical composition of the steel itself, the interaction state, the use conditions and the type of environmental media. For example, the 304 flange has good corrosion resistance in a dry and clean atmosphere, but it will be moved to the coastal area. In the sea with a large amount of salt fog, it will quickly rust, and the 316 flange performs well. . Therefore, it is not any kind of stainless steel, it is resistant to corrosion and rust in any environment.
The stainless steel flange is not completely rust-proof, but its oxidation resistance is stronger than that of ordinary steel, so it is called stainless steel.
Stainless steel not only has the ability to resist atmospheric oxidation, but also has the ability to corrode in acid, alkali, and salt media. However, the size of its corrosion resistance varies with the chemical composition of the steel itself, the interaction state, the use conditions and the type of environmental media. For example, the 304 flange has good corrosion resistance in a dry and clean atmosphere, but it will be moved to the coastal area. In the sea with a large amount of salt fog, it will quickly rust, and the 316 flange performs well. . Therefore, it is not any kind of stainless steel, it is resistant to corrosion and rust in any environment.
Stainless steel is based on the extremely thin, solid, dense and stable chromium-rich oxide film (protective film) formed on its surface to prevent the penetration and oxidation of oxygen atoms and continue to obtain rust resistance. Once this is the reason, the membrane will continue to be destroyed, the oxygen atoms in the air or liquid will continue to penetrate, and the iron atoms in the metal will continue to separate out to form loose iron oxide, and the metal surface will be Constant rusting. This kind of surface film has many forms of damage, the following are common in daily life:
1. The surface of stainless steel contains dust or other metal particles containing other metal elements. In the humid air, the condensed water between the stainless steel and the two adheres, connecting the two to form a micro battery, causing an electrochemical reaction and destroying the protective film, which is called electrochemical corrosion.
2. Organic juices (such as fruits and vegetables, noodle soup, sputum, etc.) adhere to the surface of stainless steel. In the presence of water and oxygen, it will form an organic acid, which will corrode the metal surface for a long time.
3. The surface of stainless steel contains acid, alkali, salt and other substances (such as alkaline water, stone water, etc. splashed on the wall), causing local corrosion.
4. In the polluted air (such as the atmosphere containing a large amount of sulfide, carbon oxide and nitrogen oxide), the condensed water will form sulfuric acid, nitric acid and acetic acid liquid spots, causing chemical corrosion.
