Gear Steel: 28MnCr5

● Features and Scope:
Is imported from Germany CrMn low-alloy steel. Have good thermal processing performance, good hardenability and cutting performance. Manufacturing reverse gear and second gear in Santana, the fourth gear output gear, also can replace 20CrMnTi manufacture of gears and gear shaft in no other cars in.
● Chemical Composition:
Carbon C: 0.25 ~ 0.30
Si Si: ≤0.25
Mn Mn: 0.50 ~ 0.80
Sulfur S: 0.010 ~ 0.035
Phosphorus P: ≤0.035
Chromium Cr: 0.80 ~ 1.10
Ni Ni: <0.30
Mo Mo: <0.15
● Mechanical Properties:
Tensile strength σb (MPa): 1307
Yield strength σs (MPa): 982
Elongation δ5 (%): 7.3
Reduction of ψ (%): 35
Impact toughness αku (J / cm2): 40
Hardness: 413HB
Sample size: a sample
● Heat treatment and microstructure specifications:
Heat treatment specifications: 890 ℃ normalizing, air-cooled; 820 ℃ oil quenching, 190 ℃ tempering 2h, air-cooled.
Microstructure: thick tempered martensite and a very small amount of residual austenite.