28MnCr5- Characteristics and Scope of Application
28MnCr5 is a CrMn low-alloy steel imported from Germany. 28MnCr5 has good thermal processing performance, good hardenability, and cutting performance. In Santana cars, reverse gears and output gears for second and fourth gears can be manufactured. It can also replace 20CrMnTi in other cars to manufacture various gears and toothless shafts.
28MnCr5- Chemical composition
Carbon C: 0.25-0.30
Silicon Si: ≤ 0.25
Manganese Mn: 0.50-0.80
Sulfur S: 0.010-0.035
Phosphorus P: ≤ 0.035
Chromium Cr: 0.80-1.10
Nickel Ni:<0.30
Molybdenum Mo:<0.15
28MnCr5- Mechanical Properties
Tensile strength σ b (MPa): 1307
Yield strength σ s (MPa): 982
Elongation rate δ 5 (%): 7.3
Shrinkage rate of cross-section (%): 35
Impact toughness value α ku (J/cm2): 40
Hardness: 413HB
28MnCr5- Heat Treatment Specification and Metallographic Structure
Heat treatment specification: 890 ℃ normalizing, air cooling; 820 ℃ oil quenching, 190 ℃ tempering for 2 hours, air cooling.
Metallographic structure: Coarse tempered martensite and minimal residual austenite.
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