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The role of alloying elements in stainless steel

times:2022-04-21 01:21:10read:

Iron (Fe) is the basic metal element of stainless steel.
Chromium (Cr) is the main ferrite-forming element. Chromium can combine with oxygen to form a Cr2O3 passivation film. It is one of the basic elements maintained by stainless steel. Increasing the chromium content can improve the passive film repair ability of steel. The chromium in general stainless steel The content must be above 0.12.
Nickel (Ni) is the main austenite forming element, which can slow down the corrosion of steel and the growth of grains when heated.
Molybdenum (Mo) is a carbide forming element. The carbides formed are extremely stable, which can prevent the grain growth of austenite when heated, and reduce the overheating sensitivity of steel. In addition, the molybdenum element can make the passivation film denser and firmer.  So as to improve the Cl-corrosiveness of stainless steel.
Niobium and titanium (Nb, Ti) are strong carbide forming elements that can improve the intergranular corrosion ability of steel. However, titanium carbide has an adverse effect on the surface quality of stainless steel. Therefore, niobium is generally added to improve the performance of stainless steel with high surface requirements.
Manganese (Mn) improves the hardenability of steel and improves the hot workability of steel. Steel with a manganese content of 0.11-0.14 has higher abrasiveness and can be used for ball mill liners, etc. Higher manganese will reduce the ability to be resistant to corrosion.