With the increase of isothermal quenching temperature, hardness and impact toughness of 42CrMo seamless steel pipe decrease gradually at 260℃. With the prolongation of isothermal quenching time, the hardness of 42CrMo seamless steel pipe decreases slowly, and the impact toughness reaches its maximum value at isothermal 45 min.
After isothermal quenching, the hardness of 42CrMo seamless steel pipe decreases with the increase of tempering temperature, and the hardness of quenched steel is the highest. The tempering brittleness of the isothermal quenching microstructure of 42CrMo seamless steel pipe at 360℃ is obvious, and the impact toughness of the steel decreases sharply.
In order to improve the hardness and impact toughness of 42CrMo seamless steel pipe, there is no need for tempering after isothermal quenching at 260℃for 15 ~ 45 min, after austenitizing at 880℃. For example, in order to eliminate martensite quenching stress, it is more suitable to temper 42CrMo seamless steel pipe after isothermal quenching in the range of 160 ~ 260℃.
There are more detail information about 42CrMo seamless steel pipe in Katalor. Please contact us timely if you have any need in 42CrMo seamless steel pipe. We can supply 42CrMo seamless steel pipe according your requies.
