What is 316 stainless steel?
316 stainless steel is a grade of stainless steel produced according to the American ASTM standard. 316 is equivalent to China's 0Cr17Ni12Mo2 stainless steel. Japan also quoted the American name and called it: SUS316. 316 stainless steel is the second most widely used steel after 304. It is mainly used in the food industry, watch accessories, pharmaceutical industry and surgical equipment. The addition of molybdenum element gives it a special corrosion-resistant structure. Because it has better chloride corrosion resistance than 304, it is also used as "marine steel". SS316 is usually used in nuclear fuel recovery devices.
Stainless steel is a kind of alloy steel
The "stainless steel" we usually say is called "stainless acid-resistant steel". It is actually very simple to make steel rust-proof. You just need to add some metal impurities to make alloy steel (such as adding chromium). But rust-proof only means that it will not be corroded by air, and its ability is still too poor. So we also need it to be resistant to chemical corrosion, so "stainless acid-resistant steel" appeared. To make stainless acid-resistant steel, many kinds of metals need to be added. Different metal formulas form different stainless steels. Stainless steel has the ability to resist atmospheric oxidation and rust, and also has the ability to resist corrosion in media containing acids, alkalis, and salts. Stainless steel is not incapable of rusting, but it is not easy to rust. 316 stainless steel will rust over time. Due to the addition of Mo elements, 316 stainless steel has greatly improved corrosion resistance and high temperature resistance. The high temperature resistance can reach 1200-1300 degrees, and it can be used under relatively harsh conditions.
Why does 316L stainless steel corrode?
1. Foreign matter such as dust or metal particles of other metal elements are attached to the surface of the stainless steel plate. When encountering moisture, these foreign matter will connect with the condensed water on the 316L stainless steel to form a micro-battery, produce an electrochemical reaction, and destroy the protective film on the stainless steel plate surface. This is the electrochemical corrosion of stainless steel.
2. There are organic juices (such as soup, juice, etc.) on the surface of the stainless steel plate. When encountering water and oxygen scenes, organic acids will be formed. Over time, these organic acids will corrode the stainless steel plate surface.
3. The presence of some acid, alkali, and salt liquid substances (such as lime water, alkaline water, etc.) on the stainless steel plate surface will cause local corrosion of the stainless steel plate surface.
4. When in polluted air (such as an atmosphere with a large amount of sulfide, carbon oxide, and ammonia oxide), it is easy to generate acetic acid liquid points, sulfuric acid, and nitric acid when encountering condensed water on the surface of stainless steel. This is the chemical corrosion of stainless steel.
All of the above scenarios will cause corrosion on the surface of 316L stainless steel plates.
Reasons for rusting of 316L stainless steel
A. Stainless steel will also rust under certain conditions. Although 316L stainless steel has natural resistance to atmospheric oxidation, that is, it does not rust, it can also resist corrosion in environments containing acids, alkalis, and salts, that is, corrosion resistance. However, the corrosion resistance of 316L stainless steel varies with its own chemical composition, mutual state, use conditions, and environmental medium type.
B. For example, in a dry and clean atmosphere, the corrosion resistance of 304 stainless steel is absolutely excellent, but once it reaches the coastal area, it is easily rusted by the concentrated salt sea fog, but 316 stainless steel performs better. Therefore, stainless steel is not corrosion-resistant and rust-free in any environment.
C.The surface of 316L stainless steel has an extremely thin, strong, fine and stable ferrous oxide film (protective film), which can prevent oxygen atoms from penetrating and oxidizing the matrix, which is also the origin of its anti-corrosion performance. However, if for some reason, this film will be continuously damaged, and the oxygen atoms in the air or liquid will continue to separate, producing loose iron oxide, and the stainless steel plate surface will also rust.
How to extend the life of stainless steel pipes?
Whether stainless steel pipes will not rust depends mainly on the material of the
stainless steel pipes themselves, and also on the installation environment of the stainless steel pipes. If the environment is relatively acidic, or there is a lot of acid rain, the seaside, etc., will cause the stainless steel pipes to rust. If
You want to extend the life of stainless steel pipes and reduce the corrosion and rust of stainless steel, in addition to choosing a regular stainless steel manufacturer and ensuring the material of the stainless steel pipes, later maintenance is also very important. For example, in places with frequent acid rain or coastal areas, stainless steel pipes must be maintained regularly. After acid rain, the stainless steel pipes must be wiped and the pickling liquid must not be allowed to adhere to the surface of the stainless steel pipes. This can reduce the corrosion of the pickling substances on the stainless steel pipes, thereby increasing the service life of the stainless steel pipes. If
There are slight rust spots, you can wipe them with a little rust remover to destroy the further expansion of the rust spots and reduce corrosion spots. To this end, stainless steel pipes must be selected correctly and used reasonably. The correct choice is to select stainless steel pipes according to the requirements of specific use conditions. Reasonable use means to reasonably exert the anti-rust and anti-corrosion properties of stainless steel pipes.
Wrong choice or unreasonable use will cause stainless steel pipes to rust and corrode. Quality problems of stainless steel pipes will also cause stainless steel pipes to rust and corrode. Therefore, the quality of stainless steel pipes is the prerequisite for correct selection and reasonable use of stainless steel pipes.
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