Issue: Uneven Quenching Hardness in Large-Scale H13 Shredder Blades

Insufficient Machining Allowance: The forging allowance is too small, resulting in inadequate removal of the "black skin" (surface decarburization layer). Consequently, the carbon content in certain areas of the blade remains too low.

High Loading Density: Excessive furnace loads lead to overly dense packing during quenching. This prevents uniform coolant circulation, resulting in inconsistent cooling rates across the blades.

Overheating or Prolonged Isothermal Holding: Underheating or excessive holding times can lead to coarse grain structures.

Conclusion: Under actual production conditions, the first two points are the primary causes of failure.

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