Quenching or quenching and tempering with good mechanical properties, low temperature impact toughness are better. Sensitive to this tendency of steel with white spots, high-temperature tempering have tendency to temper brittleness. Quenched martensite hardness to half, when oil quenching hardenability Φ50 ~ 70mm. Can be good machinability, weldability medium.
Chemical composition
Mass fraction (%):
C: 0.17 ~ 0.24
Si: 0.17 ~ 0.37
Mn: 0.30 ~ 0.60
Cr: 0.60 ~ 0.90
Ni: 2.75 ~ 3.15
