Stamping die is a special process equipment which processes materials into parts (or semi-finished products) in cold stamping process. It is called cold stamping die. Stamping is a kind of pressure processing method which uses the die installed on the press to exert pressure on the material at room temperature to produce separation or plastic deformation so as to obtain the required parts. Stamping die materials include die steel, cemented carbide, steel-bonded cemented carbide, zinc-based alloy, low melting point alloy, aluminum bronze and so on. At present, most of the materials for stamping die are die steel. The common types of die working parts are: carbon tool steel, low alloy tool steel, high carbon and high chromium or medium chromium tool steel, medium carbon alloy steel, high speed steel, matrix steel and cemented carbide, etc.
1. carbon tool steel
T8A and T10A are the most widely used carbon tool steels in dies, which have the advantages of good processing performance and low price. But the hardenability and red hardness are poor, the heat treatment deformation is large, and the bearing capacity is low.
2. low alloy tool steel
Low alloy tool steel is based on carbon tool steel with a suitable amount of alloying elements. Compared with carbon tool steel, it reduces the tendency of quenching deformation and cracking, improves the hardenability and wear resistance of steel. The low alloy steels used for making moulds are CrWMn, 9Mn2V, 7CrSiMnMoV, 6CrNiSiMnMoV and so on.
3. high carbon and high chromium tool steel
Commonly used high-carbon and high-chromium tool steels are Cr12 and Cr12MoV, Cr12Mo1V1 (D2) Cr12Mo1V (SKD11), Cr8Mo1VSi (DC53), etc. They have good hardenability, hardenability and wear resistance. The heat treatment deformation is very small. They are high wear-resistant micro-deformation die steels, and their bearing capacity is only inferior to high-speed steel.
4. high carbon medium chromium tool steel
High carbon medium chromium tool steels used for dies include Cr4W2MoV, Cr6WV and Cr5MoV. They have low chromium content, few eutectic carbides, uniform distribution of carbides, small heat treatment deformation, and good hardenability and dimensional stability.
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