1.Has high toughnessDuring the extrusion process, the mold must withstand complicated loads such as excessive pressing force, bending stress and impact. Therefore, the selected materials should have high toughness after heat treatment. Therefore, the mold material should have Good hardenability, so as to ensure the mold can be hardened and evenly organized. Large blocks of carbides and severe defects such as severe deflection, fiber orientation and non-metallic inclusions can reduce the toughness of the mold or cause stress concentration during load, causing early damage to the mold.

2.Good wear resistanceThe mold should have high wear resistance to ensure a normal service life and produce a large number of qualified extrusion parts.In general, the hardness and wear resistance of steel are proportional to certain conditions, so it is required that the mold material not only has sufficient hardenability, but also has high hardenability. However, in addition to the hardness, the wear resistance of the steel is determined by the thickness, composition, excess and tempering precipitation of the tungsten carbide die phase after heat treatment, size, type, dispersion and red hardness. For example, high-speed steel and low-alloy tool steel, although they have the same hardness value after heat treatment, the wear resistance of the former is much higher in actual use, while the hard alloy containing 80% or more of WC has higher wear resistance than steel. Ten times, so in the large-scale extrusion production, in order to obtain the long service life of the mold, high-speed steel and hard alloy with high cost and complicated process are still used as the mold material.

3.Adequate thermal stabilityWhen continuous production, the temperature rise of the tungsten carbide diesometimes reaches or exceeds 200 degrees. This is the mold material with tempering temperature of 160-180 degrees, which will reduce the strength and hardness. Therefore, the mold material with higher temperature rise should be used. Good resistance to tempering.

4.Good processabilityThe cold extrusion die has a long manufacturing cycle, complicated process and high precision. Generally, it must be forged, cut, heat treated, ground or otherwise finished. Therefore, only materials with relatively good processability can meet the needs of production.

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