Will 201 stainless steel sheet rust outdoors? - Shandong Jiugang Tisco Steel Co., Ltd.

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Will 201 stainless steel sheet rust outdoors?

Will the stainless steel plate made of 201 rust in the end? If the air is not circulating, such as in places where gas is often burned, it will rust in a year, but a substandard 201 stainless steel plate will not last a year, if it is simply exposed to rain, it will not rust, at least it should be clear that it is chromium-manganese steel.

How many years of normal use of 201 stainless steel plate does not rust? This depends on the use of the environment.

1, ordinary indoor 201 stainless steel plate life in about 2 years.

2, if in the ordinary outdoor, the service life of 201 stainless steel in about 1 year.

3, if in the seaside 201 stainless steel plate of a few months will rot.

4, if in the factory under the strong acid and alkali, not to mention the 201 stainless steel plate is 304 stainless steel plate is also a few days to finish.

201 stainless steel outdoor can use a few years

Qualified 201 stainless steel plate, if simply dripping rain will not rust basically. But substandard 201 stainless steel will not last a year.

200 series stainless steel is originally a stainless steel made of manganese instead of nickel, and can only serve the purpose of 300 series stainless steel in some applications. (Something the Americans came up with during WWII to pay for due to nickel scarcity)

Most of the 200 series stainless steels sold on the market do not control the sulphur and carbon content according to national standards, but use manganese (and nitrogen) instead of some or all of the nickel to produce austenitic stainless steels with lower nickel content. The rate of deterioration is approximately 10-100 times that of 304 stainless steel sheet.

Qualified 201 stainless steel sheet should have a certificate of conformity (warranty), a clear steel number (the national standard grades for 201 are: old grade 1Cr17Mn6Ni5N, new grade: 12Cr17Mn6Ni5N 201C) and should at least clearly be a chromium-manganese steel.

  Why does 201 stainless steel sheet rust?

Stainless steel is not prone to rusting and the composition of stainless steel has a lot to do with it. In addition to iron, stainless steel has chromium, nickel, aluminium and silicon in its composition. The general chromium content of stainless steel is generally not less than 12%, and even up to 18% in the high. After the addition of chromium and other elements in the steel, it can change the performance of steel, such as the example of the molecular structure of steel more uniform, the surface of the steel is more likely to generate a dense oxide protective film, etc., thus greatly improving the corrosion resistance of stainless steel. So stainless steel can resist fire, water, acid, alkali and various solutions to its corrosion, not rust.

Scientists have found that the more uniform the internal structure of steel, the more closely the various components are linked, the more difficult it is for corrosive substances to invade, plus the surface is attached to a protective oxide film, just like putting on armour for steel, naturally it is not easy to rust. Why does stainless steel rust too? When the surface of the stainless steel tube brown rust spots (points), people are surprised: that “stainless steel is not rust, rust is not stainless steel, may be a problem with the quality of steel”.

In fact, this is a one-sided misconception of the lack of understanding of stainless steel. Stainless steel will also rust under certain conditions. Stainless steel has the ability to resist atmospheric oxidation – that is, stainless steel, but also in the medium containing acid, alkali, salt is the ability to corrode – that is, corrosion resistance. But the size of its corrosion resistance is with its steel itself chemical composition, plus mutual state, the use of conditions and environmental media type and change.

Such as 304 stainless steel pipe, in a dry and clean atmosphere, there is absolutely excellent corrosion resistance, but it will be moved to the seaside area, in the sea spray containing a large amount of salt, will soon rust; and 316 stainless steel pipe is good performance. Therefore, not any kind of stainless steel, in any environment can be resistant to corrosion, not rust. Stainless steel is formed on its surface by a layer of very thin and strong and fine stable chromium-rich oxide film (protective film), to prevent the continued penetration of oxygen atoms, continued oxidation, and the ability to resist rust and corrosion.

Once there is some reason, this film has been constantly destroyed, air or liquid oxygen atoms will continue to infiltrate or metal iron atoms constantly precipitated out, the formation of loose iron oxide, metal surface is also subject to constant rusting. This surface film is damaged in many forms, the following are common in daily life: 1.

The surface of stainless steel contains other metal elements of dust or foreign metal particles attached to the surface, in the humid air, attached to the condensation between the stainless steel, the two will be connected into a microcell, triggering an electrochemical reaction, the protective film is damaged, called electrochemical corrosion.

2. Stainless steel surface adhesion of organic matter juice (such as vegetables, noodle soup, spit, etc.), in the case of water oxygen, constituting organic acid, a long time then organic acid corrosion of the metal surface.

3. Stainless steel surface adhesion containing acids, alkalis, salts (such as decorative walls of alkaline water, lime water spray), causing local corrosion.

4. In the polluted air (such as containing a large number of sulphides, carbon dioxide, nitrogen oxide atmosphere), condensation, the formation of sulphuric acid, nitric acid, acetic acid liquid point, causing chemical corrosion.



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