... . 3.JIS, DIN, ASTM, BS certificates. Crusher Hammer :Bimetal Composited Crusher HammerTypeMaterialWeight (kg)Hardness (HRC)Impact ductility Ak(J ... toughness and hardness conflict, promote the wear resistanceof hammer. Bimetal hammer it can be applied to high impact environment, ... lifetime can be 2-3 times of traditional products.Bimetal especiallysuit for large ball crusher plates and crusher hammers, ...