Gear steel: 25MnCr5
Characteristics of 25MnCr5
25MnCr5 gear steel is a CrMn low-alloy steel imported from Germany. Has good thermal processing performance, good hardenability, and cutting performance. Permeable carbon steel has high strength and toughness, and good hardenability. The performance obtained after heat treatment is better than that of 20Cr. Small quenching deformation, good low-temperature toughness, and good machinability; But the welding performance is low. Generally used after carburizing, quenching or tempering. purpose
25MnCr5 gear steel is used to make various stroke gears and shafts in cars. Used for manufacturing and heavy-duty large section quenched and tempered parts, as well as small section carburized parts. It can also be used to manufacture medium load, low impact small and medium-sized parts, replacing 20CrNi, such as gears, shafts, friction wheels, sleeves of worm gear governors, etc
Chemical composition of 25MnCr5
Sulfur S: 0.010-0.035
Phosphorus P: ≤ 0.035
Chromium Cr: 0.80-1.10
Mechanical properties of 25MnCr5
Tensile strength σ b (MPa): 1587
Yield strength σ s (MPa): 1213
Elongation rate δ 5 (%): 7.9
Shrinkage rate of cross-section (%): 36
Impact toughness value α ku (J/cm2): 51
Hardness: 268HB
Heat treatment specifications and metallographic structure
Heat treatment specifications: 890 ℃ normalizing, insulation for 2 hours, air cooling; Oil quenching at 830 ℃, tempering at 190 ℃, holding for 2 hours, air cooling.
Metallographic structure: tempered martensite+ferrite.
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