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Made of H13 hot work die steel or 38CrMoAl and other materials, heat treatment is carried out by nitriding or nitriding, with high hardness (HRC56-HRC59), good wear resistance and strong comprehensive performance; the opening and hole shape of the flat die are designed and made by professionals with many years of experience; the flat die is processed by fully automatic machining center, with uniform milling and drilling, which completely exceeds the accuracy of use; the hole wall roughness is HRC1.6.