Reasons for blackening of stainless steel wire mesh

Stainless steel wire mesh occasionally becomes black during use. What is the reason for this? This is still related to the elements of the original material. Let's analyze it together.

The so-called main elements of stainless steel are iron, nickel, and chromium. The three metals can be produced in different proportions. The obtained stainless steel products also have different properties and appearance. With the same iron content, the higher the chromium content, the brighter the stainless steel wire, and the higher the nickel content, the darker. If the content of chromium and nickel is unchanged, the content of iron will also become darker if the content of iron is increased. This is the initial judgment of the appearance of the product.

If blackening occurs during use, it is caused by oxidation, that is, the iron element contained in it will quickly turn black when oxidized, without showing signs of rust.

There is another problem: in the production process, the wire drawing machine is not sufficiently lubricated, the frictional resistance is too large, and the surface of the stainless steel wire is severely heated, which causes the segregation of the metal elements inside the steel wire, and the alloy is analyzed, resulting in a black surface.