Why is manganese used in stainless steel screens

Manganese and nickel in stainless steel mesh are alloying elements that promote the formation of austenite, so they can replace nickel (or part of nickel), but manganese itself is not corrosion-resistant. Therefore, manganese cannot be used as an alloying element in stainless steel mesh. The effect of manganese on austenite is similar to that of nickel. Instead of forming austenite, it reduces the critical cooling rate of steel, improves the stability of austenite during cooling, and inhibits the decomposition of austenite.

Austenite formed at high temperature can be kept at room temperature, and the effect of manganese on the corrosion resistance of steel is not obvious. This is because manganese has little effect on the potential of the added solid solution electrode, and the protective effect of the oxide film formation is very low. Austenitic steels used in industry cannot be used as stainless steel filters, so they are not stainless steel filters.

Completely using manganese instead of nickel in stainless steel mesh cannot solve the corrosion resistance of stainless steel mesh. This is because chromium-manganese steel should obtain a complete austenite. In addition to the appropriate chromium and manganese content, the carbon content should also be considered. When the carbon content in the steel is low, it is difficult to obtain a complete austenitic structure. If the carbon content in the steel is increased, the corrosion resistance of the steel will be reduced. In addition, the chromium-manganese stainless steel is heated at 500-800℃, and the crystals of the steel are heated. The resistance to intergranular corrosion will be very low. The addition of titanium and niobium will not reduce its sensitivity to intergranular corrosion.

Therefore, according to the 18-8 chromium-nickel austenitic stainless steel weaving type, the replacement of manganese and manganese or the simultaneous addition of manganese and nitrogen are used to replace all nickel, low-nickel stainless steel mesh and nickel-free stainless steel wire mesh, such as 12cr17mn6ni5n (201) and 20cr15mn15ni2n, are used to replace nickel-manganese and nitrogen wire mesh. There are also 26Cr18Mn12Si2N, etc. The standard has been accepted and applied, and some can replace the traditional 18-8 type chromium-nickel stainless steel mesh, such as 10Cr17Mn9Ni4N, 20Cr13Mn9Ni4, with excellent atmospheric corrosion resistance.