1 Alloy Ring Die: Carburizing and hardening (surface hardening) of ring dies is a heat treatment method. That is, the ring die is heated to a high temperature, and then mixed with a sufficient amount of carbon gas, so that the outer layer of steel absorbs a lot of carbon. This carbon makes the surface of the steel mold become harder, thus increasing the wear resistance of the surface of the ring mold, and the core material, which contains less carbon, is soft and has high impact toughness. This type of ring mold is not easy to crack. At the same time, because the surface is carbonized hard layer, so the core is tough, ring die more wear-resistant. But this type of ring mold corrosion resistance is poor.
2 chrome ring die: chrome ring die is sometimes called stainless steel ring die. Generally used X46Cr13 hardened or vacuum hardened ring die made. This material contains about 0.4% -0.5% carbon, chromium 12% -14%. This type of ring die, can prevent pitting of granulated raw materials, but wear resistance and toughness than the carburized steel ring die is poor, their outer surface is not hard, but the core is harder than the carburized steel ring die. When viewed through a microscope, standard neutral hardened chrome ring dies show very little change in hardening from the surface to the core.
3 Carburized Stainless Steel Ring Die: This type of ring die is a better product. Carburized stainless steel ring dies have similar hardened surfaces to alloy steel ring dies and are generally very wear resistant due to the large amount of chromium carbide in the carburized layer, but they, like carburized alloys, progressively decrease in hardness from the surface to the core. These ring dies are more corrosion resistant than alloy ring dies, but less so than chrome ring dies.
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