Stamping die material types and characteristics
Stamping die manufacturing materials are steel, carbide, steel hard alloy, zinc-based alloys, low melting point alloys, aluminum bronze, polymer materials and so on. At present, most of the materials used for making stamping dies are mainly steel. The types of materials used for the working parts of molds include: carbon tool steel, low-alloy tool steel, high-carbon high chromium or medium-chromium tool steel, medium carbon alloy steel, Steel, base steel and carbide, steel hard alloy and so on.
1. Carbon tool steel
In the mold more carbon tool steel for the T8A, T10A, etc., the advantages of processing performance, cheap. However, hardenability and red hardness is poor, heat treatment deformation, bearing capacity is low.
2 low alloy tool steel
Low-alloy tool steel is based on the carbon tool steel by adding the right amount of alloying elements. Compared with the carbon tool steel, reducing the quenching deformation and cracking tendency to improve the hardenability of steel, wear resistance is also better. Low-alloy steel used in the manufacture of molds is CrWMn, 9Mn2V, 7CrSiMnMoV (code CH-1), 6CrNiSiMnMoV (code GD), and the like.
3. High-carbon high-chromium tool steel
Commonly used high-carbon high-chromium tool steel with Cr12 and Cr12MoV, Cr12Mo1V1 (code D2), they have better hardenability, hardenability and wear resistance, heat treatment deformation is small, high wear resistant micro-deformation of steel, bearing Second only to high-speed steel capacity. However, severe segregation of carbide, must be repeated upsetting (axial upsetting, radial pull) forging, carbide in order to reduce non-uniformity and improve performance.
4. High-carbon chromium tool steel
High-carbon chromium tool steel used in the mold is Cr4W2MoV, Cr6WV, Cr5MoV, etc. They have a low content of chromium, eutectic carbide, carbide distribution, heat deformation, with good hardenability and dimensional stability Sex. Compared with carbide segregation is relatively serious high-carbon high-chromium steel, the performance has improved.
High-speed steel mold steel with the highest hardness, wear resistance and compressive strength, high carrying capacity. W18Cr4V (code 8-4-1) and tungsten W6Mo5 Cr4V2 (code 6-5-4-2, U.S. mark M2) are commonly used in molds, as well as carbon-reduced and vanadium-reduced high-speed steels 6W6Mo5 Cr4V (code 6W6 or low carbon M2). High-speed steel also needs to be forged to improve its carbide distribution.
6 base steel
In the basic ingredients of high-speed steel to add a small amount of other elements, appropriate increase or decrease the carbon content to improve the performance of steel. This type of steel collectively referred to as base steel. They not only have the characteristics of high-speed steel, have a certain degree of wear resistance and hardness, and fatigue strength and toughness are superior to high-speed steel, high strength and toughness of cold work die steel, the material cost is lower than high-speed steel. Commonly used in the mold base steel with 6Cr4W3Mo2VNb (code 65Nb), 7Cr7Mo2V2Si (code LD), 5Cr4Mo3SiMnVAL (code 012AL) and so on.
7. Carbide and steel cemented carbide
Carbide hardness and wear resistance than any other kind of die steel, but poor bending strength and toughness. Carbide used as a mold is tungsten and cobalt, on the small impact and wear resistance of the mold, the choice of low cobalt content of cemented carbide. Large impact on the mold, the choice of higher cobalt content of cemented carbide.
Steel bonded carbide is a small amount of iron powder by adding alloying elements (such as chromium, molybdenum, tungsten, vanadium, etc.) as a binder to titanium carbide or tungsten carbide as a hard phase, sintered by powder metallurgy. Steel bonded carbide matrix is steel, to overcome the carbide toughness is poor, the shortcomings of processing difficulties, you can cutting, welding, forging and heat treatment. Carbide carbide contains a large amount of carbide, although the hardness and wear resistance lower than the cemented carbide, but still higher than other types of steel, the hardness after quenching and tempering up to 68 ~ 73HRC.
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