GBT 65Mn Structure steel round bar Hardness

GBT 65Mn Structure steel round bar can through hardening in φ12mm steel oil, where the manganese can improve the hardenability. GBT 65Mn Structure steel round bar surface decarburization tendency smaller than silicon steel, mechanical properties superior to steel after heat treatment, but there is overheating sensitivity and temper brittleness.
GBT 65Mn Structure steel round bar Chemical composition(%):
C:0.62-0.70 Si:0.17-0.37 Mn:0.90-1.20 P≤0.035 S≤0.035 Cr≤0.25 Ni≤0.25
GBT 65Mn Structure steel round bar Mechanical properties:
Yield Rp0.2(MPa)≥868 Tensile Rm(MPa)≥892 Impact KV/Ku(J):43 Elongation A(%):43 Reduction in cross section on fracture Z(%):31 As-Heat-Treated Condition:Solution and Aging,Annealing,Ausaging,Q+T,etc Brinell hardness(HBW):124
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