The Rust Causes Of 304 Stainless Steel Wire Mesh
There is rust in the 304 stainless steel wire mesh, which may be due to the following reasons:
Chloride
Chloride ions are widely present, such as salt/sweat/seawater/sea breeze/soil. Stainless steel wire mesh corrodes quickly in the presence of chloride ions, 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.
Solution treatment
The alloying elements are not dissolved in the matrix, resulting in a low content of the matrix microstructure and poor corrosion resistance.
Intergranular corrosion
This stainless steel mesh without titanium and niobium has a tendency to 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. A multifaceted type 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. Used in applications where soldering is required. The lower carbon content minimizes the precipitation of carbides in the heat affected zone near the weld, which may result in intergranular corrosion (weld erosion) in certain environments.
Surface phenomenon
The surface mark phenomenon refers to the deep processing of 304 stainless steel wire mesh or the grinding of processed products, and wire defects or dot-like pit marks are formed on the surface of the product.
Cause: There are foreign objects on the surface and the surface of the mold, and there are scars on the surface of the pressure pad.
Countermeasure: Remove foreign matter, scars before processing, and remove orange peel by sufficient grinding.
The orange peel phenomenon refers to a phenomenon in which a 304 stainless steel molded article has a shape like an orange peel in the case of grinding or other conditions.
Reason: The grinding is not sufficient. The larger the processing, the more serious the orange peel, the coarser the raw material grains, and the heat treatment softens.
Countermeasure: The deep-processed product is fully ground, and the suitable heat treatment conditions are selected to control the grain size of the raw material.
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