What is the chemical composition of 30CrMo steel

30CrMo belongs to alloy structural steel. According to GB / T 3077 standard, the unified number code is A30302. It is equivalent to SCM430 in Japan.

30CrMo steel has high strength, resistance and hardenability. The critical hardenability in oil is 15-70mm; The thermal strength of the 30CrMo steel is also good, and it has satisfied high temperature strength below 500℃, but the strength decreases significantly at 550℃.

Chemical composition of 30CrMo steel (%):
C: 0.26-0.34;
Si: 0.17-0.37;
Mn: 0.40-0.70;
Cr: 0.80-1.10;
Mo: 0.15-0.25;
P: ≤ 0.035;
Sulfur s: ≤ 0.035;
Ni: ≤ 0.030;
Cu: ≤ 0.030

30CrMo steel has excellent machinability and medium plasticity during cold deformation; The first kind of temper brittleness occurs in the range of 300-350℃.

30CrMo steel shall be delivered in the state of heat treatment (normalizing, annealing or high temperature tempering) or no heat treatment. The delivery state shall be indicated in the contract.