Casting medium alloy steel for cold stamping mould of automobile

Abstract

The invention relates to casting medium alloy steel for a cold stamping mould of an automobile. The casting medium alloy steel is characterized by comprising the following chemical components in percentage by weight: 0.50-0.65% of C, 0.90-1.20% of Si, 0.60-0.90% of Mn, 4.50-5.50% of Cr, 0.75-0.90% of Mo, 0.70-0.80% of V, less than or equal to 0.02% of S or less than or equal to 0.03% of P. The casting medium alloy steel has high wear resistance and strong toughness, is low in production cost, is easy to process, has the overall quenching hardness of HRC59-62 and can meet the use requirements of the mould.

Description

technical field [0001] The invention relates to a cast medium alloy steel for automobile cold stamping dies, belonging to the technical field of alloy steel materials. Background technique [0002] In the forming and punching process of automobile cold stamping dies, the main failure mechanisms are wear, plastic deformation, cracking and chipping. Therefore, cold work die steels require good wear resistance, high compressive strength and sufficient toughness and ductility sex. High wear resistance can increase the life of the mold and reduce downtime caused by maintenance; high compressive strength can prevent mold deformation; sufficient toughness and ductility can prevent early cracking and chipping of the material. [0003] The commonly used cold work die steel materials in China are divided into three categories. (1) Low-alloy cold-working die steel, such as 7CrSiMnMoV, is a flame-hardened steel that can be cast and forged, with good toughness and poor wear resistance....

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Problems solved by technology

(2) Medium alloy cold work die steel, such as Cr5Mo1V, is a kind of air quenching die steel, which has certain wear resistance and toughness, but as a high carbon alloy steel, it is not suitable for casting, and its welding performance is poor. Compared with high alloy cold work die steel, there is a certain gap in wear resistance

(3) High-alloy cold-working die steels Cr12MoV and Cr12Mo1V1 have high hardenability, hardenability and high wear resistance, and are used for automatic blanking dies, punching and forming dies for automotive medium-thick plates and high-strength steel plates, but As a high-carbon high-chromium alloy steel, it is not suitable for casting. At the same time, due to the high content of carbon and alloy elements in the material, there are problems such as welding performance, deterioration of cutting performance, and increased tendency of quenching cracking.

[0004] Automobile cold stamping dies have the characteristics of single-piece production, which cannot be mass-produced. The shape is often complex and the size is large, and the size and position accuracy are very high. Complexity, long cycle, unable to meet the needs of the rapid development of the automobile market, and casting materials can only increase the machining allowance on the surface that needs to be processed, the allowance is generally 10-20mm, and the rest of the parts are cast open, with small processing volume and light weight. Save material cost, processing cost, shorten the manufacturing cycle, and at the same time, the casting can be designed in a single piece, the design structure is simple, and the design cycle is shortened

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