40Cr seamless steel pipe

40Cr seamless steel pipe is one of the most widely used steel pipes in machinery manufacturing. After quenching and tempering, it has good comprehensive mechanical properties, good low temperature impact toughness and low notch sensitivity. The 40Cr seamless steel pipe has good hardenability. It can be hardened to Ф28～60mm in water quenching and Ф15～40mm in oil quenching. This kind of 40Cr seamless steel pipe is suitable for cyanidation and high frequency quenching in addition to quenching and tempering treatment. The cutting performance is better. When the hardness is 174～229HB, the relative machinability is 60%. 40Cr seamless steel pipe is suitable for making medium-sized plastic molds.