Pelleting Dies Forging

The preferred material selection includes alloy tool steels such as X46CR13, 5CrNiMo, and Cr12MoV. After forging, these materials undergo integral quenching and tempering treatment to achieve a hardness range of 50-58 HRC. Notably, the hardness variation across the same ring die is maintained within ≤2 HRC (compared to 3-5 HRC typical for cast versions), ensuring uniform wear rates among all die holes and thereby extending overall service life.

The forging process aligns the metal fibers continuously along the circumferential direction of the ring die, which corresponds perfectly with the primary radial extrusion forces exerted on the die holes. This metallurgical advantage effectively prevents edge chipping around the holes - a common failure mode in cast ring dies caused by internal porosity and voids. Statistical data show cast ring dies exhibit 2-3 times higher incidence of early-stage cracking compared to their forged counterparts due to these inherent structural defects.