Alloy round bar (35Mn2) 



 Chemical Composition (%) 



 C: 0.32 ~ 0.39 Si: 0.17 ~ 0.37 Mn: 1.40 ~ 1.80 P: "0.025 S:" 0.025 

 Cr: "0.30 Ni:" 0.30 Cu "0.25 

 Mechanical properties 

 Sample rough dimensions (mm): 25 

 Heat treatment: 

 First quenching temperature (° C): 840; coolant: water 

 Second quenching temperature (° C): - 

 Tempering the heating temperature (° C): 500; coolant: water 

 Tensile strength (σb / MPa): ≥ 835 

 Yield point (σs / MPa): ≥ 685 

 Elongation (δ5 /%): ≥ 12 

 Section shrinkage rate (ψ /%): ≥ 45 

 Absorbed energy (Aku2 / J): ≥ 55 

 Brinell hardness (HBS100/3000) (annealing or high temperature tempered condition): ≤ 207 









 The main features 

 Cold deformation of the plastic medium, the machinability is acceptable but poor weldability. 30Mn2 steel, high carbon content, with higher strength, wear resistance and hardenability sexual critical hardenability diameter 7.5 ~ 20mm in oil, but the plastic is slightly lower, and the sensitivity of the white point overheating and tendency to temper brittleness, easy to form a tendency to crack when the water quenching. 



 Application examples 

 Generally used in the quenched and tempered or normalized state can be used as a connecting rod, spindle, axle, crank, cold heading bolts stress requirements for heavy and medium-sized machinery, mechanical parts; in agricultural machinery, The shovel can be used as a hoe, hoe shovel handle wear parts; instead of 40Cr steel in the manufacture of small cross section (diameter <20mm) parts.