51CrV4 is an alloy spring steel commonly used to manufacture large-scale shear blades due to its high cost-effectiveness. However, oxidation and decarburization during hot forging and heat treatment can severely impact quenching hardness, lead to quenching cracks, and reduce durability.

To mitigate these issues, it is recommended to:

Increase machining allowance appropriately during blanking and forging.

Utilize a lower softening temperature post-forging as a substitute for standard annealing.

Extend preheating time while shortening the holding time at the quenching temperature for large-scale blades.

Apply protective coatings prior to quenching to prevent surface damage.

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