抗拉强度、屈服强度及淬透性均比40号钢高，但焊接性有限，有形成裂纹的倾向。具有很好的综合力学性能。

热处理规范：淬火850℃,油冷；回火520℃,水冷、油冷。

交货状态：以热处理（正火、退火或高温回火）或不热处理状态交货，交货状态应在合同中注明。

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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.