Hammer is critical part for auto shredder. There is intense impact and friction during the production. It requires both toughness and hardness properties for best performance. It can be made of either manganese steel or low alloy steel. There is increasing demand for alloy hammer because the scrap is lighter than before. More aluminum is used for autos which cannot provide enough working hardening for manganese steel.
Differential heat treating (DHT) process is required for the low alloy hammer. The hardness gradient will keep both toughness and hardness properties on the single part. The working region will have high hardness to maximize the serving life. The soft pin hole will provide toughness during impact. The soft pin hole can also extend serving life of hammer pin which costs more and requires more labor for replacement.
Alloy material is developed to achieve the best performance. Every step is carefully taken care of. 100%MT is applied to make sure each hammer is in perfect state. Heat treatment is the key process for the hammer. There are five-steps heat treatment which lead to the martensitic microstructure at the working zone and achieve soften hardness at the pin hole area.
Post time: Jan-26-2026