Description

Stainless steel and alloy steel are the preferred materials for high-end ring dies due to their high hardness, wear resistance, and corrosion resistance. However, their high strength also presents challenges such as difficult forming, a narrow thermal processing window, and susceptibility to work hardening and surface microcracks.

Preliminary forming is commonly performed using precision die forging or ring rolling techniques. This involves applying high pressure and a specific high temperature (strictly determined by the specific alloy composition) to induce plastic flow of the metal. After the initial formation of the ring die base and die pass, an oxide scale (scale) forms on the blank surface. To prevent the intrusion of corrosive media into the base during subsequent surface treatments such as pickling or sandblasting, the formed surface must be as uniform and dense as possible, free of defects such as cracks and folds, ensuring a high-quality final surface.

Successful initial forming not only determines the geometric accuracy of the ring die but also, by optimizing the metal grain structure, lays the foundation for the product’s excellent wear resistance, fatigue strength, and corrosion resistance, directly impacting its service life and pelletizing quality.

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