强度、淬透性高，韧性好，淬火时变形小，高温时有高的蠕变强度和持久强度。用于制造要求较35CrMo钢强度更高和调质截面更大的锻件，如机车牵引用的大齿轮、增压器传动齿轮、后轴、受载荷极大的连杆及弹簧夹，也可用于 2000m以下石油深井钻杆接头与打捞工具等。

热处理规范：淬火850℃,油冷;回火560℃,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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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.