First, the presence of chloride ions in the environment
Chloride ions are widely present, such as salt/sweat/seawater/sea breeze/soil. Stainless steel in the presence of chloride ions, corrosion is very fast, even more than ordinary low carbon steel.
Therefore, there is a requirement for the use environment of stainless steel, and it is necessary to wipe frequently to remove dust and keep it clean and dry. There is an example in the United States: a company uses a oak container to hold a solution containing chloride ions. The container has been used for nearly a hundred years. It is planned to be replaced in the 1990s. Because the oak material is not modern enough, the container is replaced with stainless steel for 16 days. Leakage due to corrosion.
Second, no solution treatment
The alloying elements are not dissolved in the matrix, resulting in a low content of the matrix microstructure and poor corrosion resistance.
Third, this material without titanium and niobium has a tendency to be born with intergranular corrosion.
The addition of titanium and niobium, together with a stable treatment, can reduce intergranular corrosion.
A high-alloy steel that resists corrosion in air or chemically corrosive media. Stainless steel has an aesthetically pleasing surface and good corrosion resistance. It does not require surface treatment such as plating to give full surface properties to stainless steel. One of the aspects of steel, commonly referred to as stainless steel. Representative properties include high-alloy steels such as 13 chrome steel and 18-8 chrome nickel steel.
From the perspective of metallography, because stainless steel contains chromium and the surface forms a very thin chromium film, this film is isolated from the intrusion of oxygen in the steel to resist corrosion.
In order to maintain the corrosion resistance inherent in stainless steel, steel must contain more than 12% chromium.
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