抗拉強(qiáng)度、屈服強(qiáng)度及淬透性均比40號(hào)鋼高，但焊接性有限，有形成裂紋的傾向。具有很好的綜合力學(xué)性能。

熱處理規(guī)范：淬火850℃,油冷；回火520℃,水冷、油冷。

交貨狀態(tài)：以熱處理（正火、退火或高溫回火）或不熱處理狀態(tài)交貨，交貨狀態(tài)應(yīng)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.