Material Name: High quality carbon structural steel grades: 50Mn Standard: GB / T 699-1988 ● Features and Scope: 50Mn round strength, elasticity and hardness are higher than used in the quenching and tempering, welding performance is poor. 50Mn demanding round for the manufacture of wear in the heat treatment under high load parts such as gears, gear shafts and cross-section at 80mm below the spindle and so on. 50 steel with similar performance, but its high hardenability, strength after heat treatment. Hardness elasticity are slightly higher than the 50 steel. Poor welding, heat-sensitive and has a tendency to temper brittleness. Withstand the stress components for High wear parts such as gears gear shaft friction disc. Mandrel. Flat springs. 

 Chemical composition 

 ● Chemical Composition: 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 Cu Cu: ≤ 0.25 [2] 

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 Mechanical Properties 
 ● Mechanical Properties: Tensile σb (MPa): ≥ 645 (66) yield strength σs (MPa): ≥ 390 (40) Elongation δ5 (%): ≥ 13 Reduction of area ψ (%): ≥ 40 impacts Power Akv (J): ≥ 31 impact toughness αkv (J/cm2): ≥ 39 (4) Hardness: No heat treatment ≤ 255HB; ≤ 217HB steel annealing heat treatment: 830 ℃ normalizing, 830 ℃ quenching, 600 ℃ tempered .