What is the main role of Cr element in 40cr steel heat treatment?

In addition to quenching and tempering treatment, 40cr steel plate is also suitable for cyanidation and high-frequency quenching treatment. The cutting performance is better. When the hardness is HB174～229, the relative machinability is 60%. The steel is suitable for making medium-sized plastic molds. 40Cr belongs to GB3077 "alloy structural steel". The main role of Cr in heat treatment is to improve the hardenability of steel.

40cr steel alloy plates stock in BBN Group

40cr alloy steel plate is one of the widely used steels in the machinery manufacturing industry, suitable for making medium-sized plastic molds. After quenching and tempering, it has good comprehensive mechanical properties, good low-temperature impact toughness and low notch sensitivity.