Iron (Fe) is a basic metal element of stainless steel.
Chromium (Cr) is the main ferrite forming element. The combination of chromium and oxygen can form a passive film of Cr2O3, which is one of the basic elements maintained by stainless steel. The increase of chromium content can improve the repair ability of the passive film of steel. Generally, chromium in stainless steel The content must be above 0.12.
Nickel (Ni) is the main austenite forming element, which can slow down the corrosion phenomenon of steel and the growth of grains on heating.
Molybdenum (Mo) is a carbide-forming element. The carbides formed are extremely stable, which can prevent the grain growth of austenite during heating and reduce the overheating sensitivity of steel. In addition, molybdenum can make the passivation film more dense and firm. , thereby improving the Cl-corrosion of stainless steel.
Niobium and titanium (Nb, Ti) are strong carbide forming elements, which can improve the intergranular corrosion ability of steel. However, titanium carbide has an adverse effect on the surface quality of stainless steel, so the performance of stainless steel with higher surface requirements is generally improved by adding niobium.
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 high abrasiveness and can be used for ball mill linings, etc. Higher manganese will reduce the ability to be not easily corroded.
