What is 30Mn2 steel

What is 30Mn2 steel?
The chemical composition of 30Mn2 steel is: C 0.27-0.34, Si 0.17-0.37, Mn 1.40-1.80.
The mechanical properties of 30Mn2 steel: tensile strength ≥ 785 MPa, yield strength ≥ 635 MPa, elongation after fracture ≥ 12%, impact absorption energy ≥ 63J.

30Mn2 steel is a kind of common alloy structural steel. It is a medium carbon quenched and tempered manganese steel with carbon content of 0.30%. The strength, plasticity and wear resistance of 30Mn2 steel are high, machinability and heat treatment process performance are relatively good, but it is easy to crack during heat treatment, has white spot sensitivity, cold deformation plasticity is not high, and poor weldability, so preheating is required before welding.

30Mn2 steel is commonly used in tractor frame, gear, bearing, cold heading bolt and quenched and tempered parts with large cross section. It can also be used to make carburized parts with higher requirements for core strength, such as crane axle and journal.