Adviser

Other important alloy elements

Nickel (Ni)

Improves the general resistance to corrosion. If there is at least 7% Ni present, ferrite changes to austenite. Nickel also improves the impact and notch toughness, especially at extremely low temperatures.

 

Molybdenum (Mo)

Significantly improves resistance to corrosion, especially against pitting corrosion. It increases

strength, especially at elevated temperatures. Molybdenum is a ferrite–forming element.

 

Copper (Cu)

Even in relatively small portions (1,5%), it increases resistance to certain reducing acids (e.g. sulfuric acid).

 

Silicon and Aluminium (Si + Al)

These are ferrite–forming elements, which increase resistance to scaling, particularly in ferritic steel (chrome steel with a relatively low carbon concentration).

 

Titanium and Niobium (Ti + Nb)

These are added to ferritic and austenitic steels as stabilizing elements. They are strong carbide– forming elements, which improve resistance to intercrystalline corrosion, particularly in welding.

 

Sulfur (S)

As a non–metallic element, it is essentially an impurity. For this reason, it is usually present in small amounts. It is usually added to stainless steel for automated processing in amounts of up to 0,35% and in that way improves machinability with cutting. Steel alloyed with sulfur is not (or is poorly) weldable.

 

Nitrogen (N)

Stabilizes austenites to the same extent as carbon and increases strength. It is alloyed in stainless steel with very little carbon.

 

Manganese (Mn)

Increases strength and durability of steel.


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