37CrNi3, is a Chinese national standard alloy steel grades. Unified digital code: A42372

Chemical composition
Mass fraction (%):

C: 0.34 ~ 0.41

Si: 0.17 ~ 0.37

Mn: 0.30 ~ 0.60

     Cr: 1.20 ~ 1.60

     Ni: 3.00 ~ 3.50

Key Features
With high toughness, high hardenability, oil-cooling parts can be put completely Φ150mm hardenability. At 450 ° when the creep resistance and stability. Good low temperature impact toughness. In the range of 450 ~ 550 ℃ tempering temper brittleness when the second category, the formation of white spots tend to be larger. As good hardenability, normalizing and tempering must be to reduce the hardness and improve machinability. Generally used in the quenched state.