A kind of cold working die steel and preparation method thereof
A technology of cold working die steel and steel ingot, which is applied in the field of high-alloy steel manufacturing, and can solve the problems of severe segregation, prone to chipping, fracture and collapse, and poor toughness
Active Publication Date: 2021-05-04
SHANGHAI UNIV
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Problems solved by technology
[0005] The most used in the current market in my country is the low-end high-alloy Cr12 series cold work die steel. Although it has good wear resistance, it has poor toughness due to the existence of many large eutectic carbides and serious segregation. , long-term service is prone to chipping, fracture and collapse. Therefore, in order to meet the needs of the domestic high-end cold stamping die steel market, the present invention refers to the alloying principle of Cr8 series cold working die steel, based on the composition of Cr12MoV and Cr5Mo1V steel Appropriately add or reduce the content of Mo, V, W, Ni and other elements to improve the strength, wear resistance, thermal stability and thermal fatigue performance of the steel, while maintaining high toughness to ensure the life of the cold working die
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Embodiment 1
[0032] In the implementation case, the chemical composition mass percentage of the steel used for the high-strength automobile sheet cold stamping forming die is as follows:
[0033]
[0034] In this implementation case, the process and steps of cold working die steel are as follows:
[0035] A. Smelting: batching and smelting are carried out according to the mass percentage of the components contained in the cold work die steel as shown in the above table;
[0036] B. Electroslag remelting: before remelting, cut off the steel ingot riser, remove its surface scale, and put it in the electroslag remelting device as a consumable electrode for secondary refining. After the electrode alloy melts, it falls into the crystallizer through the slag pool, and then solidifies into a steel ingot. The steel ingot gradually crystallizes from bottom to top, with uniform composition and dense structure. After completion, the electroslag ingot is annealed.
[0037]C. Forging: reheat the ab...
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Abstract
The invention relates to the field of high-alloy steel manufacturing, in particular to a cold-working die steel and a preparation method thereof. The invention provides a cold work die steel, the mass percentage of the components contained in the cold work die steel is: C 0.90-1.20%, Si 0.90-1.20%, Mn 0.30-0.60%, Cr 7.00-9.00%, W 0.20-0.60%, Mo 0.60-1.20%, Ni 0.40-1.20%, S 0.05-0.15%, Cu 0.20-0.60%, Al 0.20-0.50%, P≤0.02%, and the balance is Fe. The preparation method of the cold work die steel of the present invention comprises: batching, smelting, casting, electroslag remelting, forging, spheroidizing annealing, and finally quenching and tempering heat treatment. Compared with the commonly used Cr12, Cr8 and Cr5 series cold work die steels, the cold work die steels described in the present invention ensure a very high strength and toughness ratio, and at the same time, the wear resistance is more than double that of Cr8Mo2VSi, and the heat treatment and surface treatment The dimensional deformation is within 0.03%, the cutting performance is more than three times higher than that of Cr12MoV, and the overall mold life is increased by 0.5-3 times.
Description
technical field [0001] The invention relates to the field of high-alloy steel manufacturing, in particular to a cold-working die steel and a preparation method thereof. Background technique [0002] Under the background of the development of nature, ecology, energy saving, safety and other major environments, the lightweight of the automobile industry and the application of high-strength steel have become an important development direction of automotive steel. Cold work dies are used the most in the automotive industry, and various new cars have been introduced to the market in recent years, and higher requirements have been put forward for the performance and quality of cold work die steel. With the further improvement of steel plate strength requirements, the impact, tension, compression, friction, and bending of the mold material during the mold processing process are also increasing, and problems such as wear, deformation, chipping, and fracture are prone to occur. . T...
Claims
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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/60C21D8/00C21D1/32C21D1/18
CPCC21D1/18C21D1/32C21D8/005C22C38/002C22C38/02C22C38/04C22C38/06C22C38/42C22C38/44C22C38/60
Inventor 吴晓春吴红庆左鹏鹏
Owner SHANGHAI UNIV