Introduction To The Role Of Residual Elements In Special Steel


8 fully reserved elements
Ni, Co, W and Mo can improve the hardenability of steel and are beneficial elements; Cu can cause copper embrittlement during high-temperture hot working of steel, but on the other hand, it can improve the ability of steel to resist atmospheric corrosion; Residual elements Sn, As and Sb are harmful elements, which not only strengthen copper brittleness in steel, but also lead to the brittleness of second tempering of alloy steel; Sn is one of the extremely harmful residual elements in steel, and Sn will greatly reduce the high temperature mechanical properties of steel and alloy.

7 partially reserved elements
C, Mn, S and P are conventional control elements; Cr can improve the oxidation resistance of steel, increase the corrosion resistance and hardenability of steel, but also increase the tempering brittleness; N is beneficial to control the grain size of austenite, but at the same time it can also cause strain aging of steel; H in steel is a harmful and unhelpful element, which can cause white spot, cracks in low-alloy high strength steel, etc.