Tensile strength, yield strength, and hardenability are higher than that of No. 40 steel, but weldability is limited and there is a tendency to form cracks. Has a good comprehensive mechanical properties.
Heat treatment specification: quenching 850 ° C, oil cooling; tempering 520 ° C, water cooling, oil cooling.
Delivery status: Delivery by heat treatment (normalizing, annealing or high temperature tempering) or no heat treatment, the delivery status should be stated in the contract.