Poor organization before the mold heat treatment
Die coarse uneven final ball of the organization , the ball is not perfect heat treatment , the organization has a mesh , ribbon and chain carbide , which will die after quenching easy to crack , resulting in mold scrapped.

( 1 ) causes
1 ) mold steel carbide segregation serious original organization .
2 ) poor forging process , such as forging heating temperature is too high , a small amount of deformation , stop forging temperature is high, the cooling rate after forging slowly , so that the organization forged thick and has a mesh , ribbon and chain carbide heat treatment exists , so difficult to remove when the ball annealing .
3 ) poor ball annealing processes , such as heat treatment annealing temperature is too high or too low a heat treatment heat treatment, heat treatment temperature and the annealing time is short , the ball annealing heat treatment can cause uneven or poor organizational ball .

( 2 ) heat treatment prevention measures
1 ) should generally be based on the mold working conditions, production volume and toughening properties of the material itself , try to choose a good quality tool steel materials.
2 ) improve the forging process or normalizing preliminary heat treatment to eliminate the raw material mesh and chain carbide and carbide heterogeneity.
3 ) that can not be forged carbon carbide segregation serious mold steel heat treatment can be carried out to refine the solution .
4) after forging die blanks are heat-treated to develop the correct ball annealing process specifications , and rapid transfer of heat treatment can be absorbed Spheroidizing work fine .
5 ) a reasonable installed furnace , billet mold to ensure uniformity of furnace heat treatment temperature .