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High-heat and strength hot work die steel and preparation method thereof

A technology of hot-working die steel and die steel, which is applied in the field of die steel, can solve problems such as insufficient high-temperature strength and hardness, and achieve good stability, high strength, and fine and uniform structure

Inactive Publication Date: 2019-01-01
宝武特种冶金有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to solve the problem of insufficient high-temperature strength and hardness of martensitic hot-working die steel at 550°C, we have developed a die steel with strong thermal stability. The main mechanism is that this type of steel works at room temperature or high temperature Under these conditions, the matrix is ​​always dispersed in a strengthened state of carbides, and the growth of carbides will not be formed at this temperature, which will lead to the problem of recovery softening of martensitic die steel

Method used

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  • High-heat and strength hot work die steel and preparation method thereof
  • High-heat and strength hot work die steel and preparation method thereof
  • High-heat and strength hot work die steel and preparation method thereof

Examples

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Embodiment 1

[0051] In this example, the composition and weight percentage of the hot work die steel are as follows:

[0052] C 0.36%, Si 0.27%, Mn 0.30%, Cr 5.35%, Mo 1.78%, V 0.55%, Co 0.23%, P 0.013%, S 0.002%, Fe balance.

[0053] In this embodiment, the process and steps of the strong thermal stability die steel are as follows:

[0054] Control the steel ingot forging according to the chemical composition ratio of the present invention at 1150°C and stop forging at 830°C; air cool to 300°C for the first time after forging; heat the steel to 1050°C for 2.5 hours, and quickly air cool to 280°C ℃; heat the steel again to 840℃ for 3.5 hours to form a fine austenite structure, and slowly cool down to room temperature at less than 25℃ per hour to obtain a fine sorbite microstructure, which meets the high-end requirements Die steel market has strict requirements on material microstructure.

[0055] The high thermal stability die steel of this embodiment has a Rockwell hardness of HRC51.5 a...

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Abstract

The invention discloses a hot work die steel, which comprises the following components: 0.36-0.40% of C, 0.10-0.40% of Si, 0.20-0.45% of Mn, 5.30-5.50% of Cr, 1.60 to 1.95% of Mo, 0.50 to 0.70% of V,0.20 to 0.40% of Co, less than 0.02% of P, less than 0.005% of S, and the balance being Fe; wherein C=1 / 25Cr+1 / 20Mo+1 / 12V+1 / 10Co. A preparation method is also provided, the forging beginning temperature of a steel ingot is 1130-1180 DEG C, and the optimum plastic deformation temperature range and the forging stopping temperature of an austenitic plastic deformation zone are above 800 DEG C; heating is carried out to 1050-1100 DEG C and insulation is carried out for 2-3 hours, and after dissolution of carbides, the second rapid air cooling is carried out to below a martensite temperature range.The steel structure of the hot work die steel is fine and uniform, and the hot work die steel is favorable for the stability of the high temperature hardness of the material.

Description

technical field [0001] The invention relates to the field of die steel, in particular to a hot work die steel with high thermal strength under high temperature service working state and a preparation method thereof. Background technique [0002] High thermal strength die steel belongs to the material category of hot work die steel. Hot work die steel is used to manufacture metal or liquid metal molded steel heated above the recrystallization temperature. This kind of mold is mainly used to manufacture hammer forging die, press forging die, hot extrusion die and die-casting die. The conditions are complicated and worse. When the mold is in contact with hot metal during operation, the surface of the mold cavity will be heated to 550°C (hot extrusion mold). Therefore, hot work die steel should have sufficient thermal stability, high temperature strength and hardness. [0003] At present, the most widely used hot work die steel material in the domestic and foreign die materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/22C22C38/24C22C38/30C22C38/04C22C38/02C21D8/00
CPCC21D8/005C21D2211/008C22C38/02C22C38/04C22C38/22C22C38/24C22C38/30
Inventor 续维赵亮
Owner 宝武特种冶金有限公司
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