Gear steel: 20MnCr5 
 Implementation of the standards: EN 10084-1998 
 ● Features and Scope: 
 Of steel imported from Germany, the equivalent of China's 20CrMn steel is hardened steel category, can also be used for quenched and tempered steel. Good hardenability, heat deformation small, low-temperature toughness, cutting performance is good, but poor weldability. Carburized parts and can be used for large cross-section, higher load conditioning parts such as gears, shafts, worm, sleeve, friction wheels. 
 ● Chemical Composition: 
 Carbon C: 0.17 ~ 0.22 
 Si Si: ≤ 0.40 
 Manganese Mn: 1.10 ~ 1.40 
 S S: 0.010 ~ 0.035 
 Phosphorus P: ≤ 0.035 
 Chromium Cr: 1.00 ~ 1.30 
 ● Mechanical Properties: 
 Tensile strength σb (MPa): 1482 
 Conditions yield strength σ0.2 (MPa): 1232 
 Elongation δ5 (%): 13 
 Reduction of area ψ (%): 57 
 Impact toughness αku (J/cm2): 73 
 Hardness: 357HB 
 Sample size: a test material 
 ● Heat treatment and microstructure specifications: 
 Heat treatment specification: 900 ℃ +870 ℃ oil quenching oil quenching, 200 ℃ tempered. 
 Microstructure: martensite.