42CrMo is a high-strength alloy structural steel plate with excellent tensile strength, impact toughness, and wear resistance (especially after heat treatment). It is widely used in machinery manufacturing for producing high-load components such as heavy-duty gear blanks, crankshafts, connecting rods, and hydraulic cylinder barrels, as its superior mechanical properties ensure stable operation under high pressure and frequent stress. In the automotive and engineering machinery fields, it is applied to make transmission shafts, chassis structural parts, and excavator boom components, benefiting from good hardenability and fatigue resistance. It also finds use in the energy sector (for high-pressure pipeline flanges and turbine parts) and the mold industry (for medium-sized mold bases), serving as a reliable material for industrial scenarios requiring high strength, toughness, and durability.