20CrMn, is a Chinese national standard alloy steel grades. Unified digital code: A22202.

Standard: GB / T 3077-1988


Chemical composition
       Mass fraction (%):

Carbon C: 0.17 ~ 0.23

Si Si: 0.17 ~ 0.37

Manganese Mn: 0.90 ~ 1.20

Sulfur S: to allow the residual content of ≤ 0.035

Phosphorus P: allow the residual content ≤ 0.035

Chromium Cr: 0.90 ~ 1.20

Ni: to allow the residual content of ≤ 0.030

Copper Cu: to allow the residual content ≤ 0.030

Key Features
Carburizing steel, strength, high toughness, good hardenability. Obtained after heat treatment is better than 20Cr. Quenching deformation is small, good low temperature toughness, good machinability; but lower weldability. Usually quenched after carburizing or use.