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Features:50Mn strength, elasticity and hardness are high, more in the quenching and tempering after use, poor welding performance. Requirements for the manufacture of wear 50Mn bar very high, in the heat treatment under high load parts such as gears, gear shafts and cross section below the spindle in 80mm and so on. Performance and 50 are similar, but its high hardenability, strength after heat treatment. hardness. elasticity are slightly higher than the 50 steel. Poor welding, with thermal sensitivity and tendency to temper brittleness. As under stress parts. high wear parts such as gears. gear shaft. friction disc. mandrel. plate spring.
Chemical compositionCarbon C: 0.48 ~ 0.56,Si Si: 0.17 ~ 0.37,Manganese Mn: 0.70 ~ 1.00,S S: ≤ 0.035,P P: ≤ 0.035,Chromium Cr: ≤ 0.25,Ni-Ni: ≤ 0.30,Copper Cu: ≤ 0.25
Mechanical Properties
Tensile strength σb (MPa): ≥ 645 (66)
Yield strength σs (MPa): ≥ 390 (40)
Elongation δ5 (%): ≥ 13
Reduction of area ψ (%): ≥ 40
Impact energy Akv (J): ≥ 31
Impact toughness αkv (J/cm2): ≥ 39 (4)
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