強度、淬透性高，韌性好，淬火時變形小，高溫時有高的蠕變強度和持久強度。用于制造要求較35CrMo鋼強度更高和調質截面更大的鍛件，如機車牽引用的大齒輪、增壓器傳動齒輪、后軸、受載荷極大的連桿及彈簧夾，也可用于 2000m以下石油深井鉆桿接頭與打撈工具等。

熱處理規范：淬火850℃,油冷;回火560℃,水冷、油冷。

交貨狀態：以熱處理（正火、退火或高溫回火）或不熱處理狀態交貨，交貨狀態應在合同中注明。

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High strength, hardenability, good toughness, small deformation during quenching, high creep strength and long-lasting strength at high temperatures. Forgings requiring higher strength and larger quenching section than 35CrMo steel, such as large gears for locomotive traction, supercharger transmission gears, rear axles, extremely loaded connecting rods and spring clips, can also be used Oil deep well drill pipe joints and fishing tools below 2000m.

Heat treatment specification: quenching 850 ° C, oil cooling; tempering 560 ° 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.