Stainless steel refers to the steel with rust and corrosion resistance as the main characteristics, and the chromium content is at least 10.5%, and the carbon content is not more than 1.2%. The main reason why stainless steel is not easy to rust is due to the elements of chromium and nickel. The higher the content of chromium and nickel, the better the corrosion resistance.
However, stainless steel is not a rust-free material, but it is not easy to rust compared with other materials, so under certain conditions, stainless steel will also rust. Here are a few reasons why stainless steel rusts.
1) When the dust of other metal elements or the attachment of dissimilar metal particles accumulates on the surface of stainless steel, electrochemical corrosion is easy to occur, resulting in rust.
2) When organic juice (such as vegetables, sputum, etc.) is attached to the surface of stainless steel, under the action of water and oxygen, it will form organic acid, and it will become corrosive after a long time.
3) When acid, alkali and salt (such as alkaline water, lime, etc.) are attached to the surface of stainless steel, it is very easy to cause local corrosion.
4) When the air contains sulfide, carbon oxide, etc. (that is, polluted air), it will form sulfuric acid, nitric acid, etc. when it encounters condensed water, which will also cause chemical corrosion.
The above four kinds of external environment will make stainless steel rust, so we try to avoid the above environment when using stainless steel products.
The reason why stainless steel does not rust is because stainless steel contains chromium to form a very thin chromium film on the surface, which isolates and resists the intrusion of oxygen in the steel. In order to maintain the inherent corrosion resistance of stainless steel, the steel must contain more than 12% chromium.
In fact, there are internal reasons that can also cause stainless steel to rust. We all know that the standard chromium content of stainless steel must be more than 10.5%. If the added content of chromium and nickel is lower than the standard value, that is, the stainless steel is not qualified at the beginning, the probability of stainless steel rusting is much higher.
Therefore, when we choose stainless steel products and materials, we must choose regular and high-quality manufacturers to cooperate. Huaxia has been deeply involved in the stainless steel trade for 15 years, and has a good cooperative relationship with many large steel mills in China. Our product quality is guaranteed and our service is warm.
We have a rich inventory of stainless steel coils/plates/tubes/rods and other types of products, and can also customize the length, width, height, thickness and weight of the products according to your needs.
