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Hot die steel and tempering process thereof

A technology of hot work die steel and process, applied in the field of hot work die steel and its tempering process

Inactive Publication Date: 2011-07-20
ZHEJIANG ZHENGDA MOLD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

3Cr2W8V steel can no longer meet the increasing requirements of hot work die steel
Other heat-strength hot work die steels currently on the market cannot completely replace 3Cr2W8V steel

Method used

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  • Hot die steel and tempering process thereof
  • Hot die steel and tempering process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5

[0022] Prepare hot work die steel raw materials of the present invention as shown in Table 1, and obtain hot work die steel by smelting according to traditional techniques.

[0023] A tempering process for the above-mentioned hot work die steel, comprising the following steps: first tempering at 450°C for 1.5 hours, cooling to room temperature; then tempering at 540°C for 1 to 2 hours, cooling to room temperature; finally tempering at 550°C Temper for 1.5 hours and cool to room temperature.

[0024] Table 1 Units (Wt%)

[0025]

Embodiment 6

[0026] Embodiment 6 impact toughness comparative experiment

[0027] The average impact toughness comparison experiments at different hardnesses (HRC) were carried out on the hot work die steels of Examples 1-5 and 3Cr2w8V, and the experiments are shown in Table 2 below.

[0028] Table 2 Specimen Specifications 7×10 Unit: (J / cm 2 )

[0029]

[0030] From the comparison of impact toughness, it can be concluded that each composition of the present invention will greatly exceed 3Cr2w8V steel at different hardness (HRC).

Embodiment 7

[0031] Embodiment 7 life comparative experiment

[0032] In different industries and different use environments, the life comparison experiments of the hot work die steels of Examples 1 to 5 and the 3Cr2w8V steel dies are performed, and the experiments are shown in Table 3 below.

[0033] Table 3 Unit: (pieces)

[0034]

[0035] Experimental data shows that the service life of the hot work die steel of the present invention is much higher than that of 3Cr2w8V steel in different occasions.

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Abstract

The invention relates to hot die steel which comprises the following components in percentage by weight: 0.32-0.42 percent of carbon, 0.2-0.5 percent of silicon, 0.2-0.5 percent of manganese, 2.2-2.7 percent of chromium, 1.0-3.4 percent of molybdenum, 0.8-2.2 percent of tungsten, 0.4-0.6 percent of vanadium, 0.2-1.5 percent of cobalt and the balance of Fe. A tempering process of the hot die steelcomprises the following steps of: firstly, tempering at 440-460 DEG C for 1-2 hours and then cooling to room temperature; then tempering at 520-560 DEG C for 1-2 hours and then cooling to room temperature; and finally, tempering at 520-560 DEG C for 1-2 hours and then cooling to room temperature. The hot die steel has the characteristics of high heat resistance and high toughness. The tempering process greatly reduces the fracture speed of materials and further improves the toughness of die materials.

Description

(1) Technical field [0001] The invention relates to a hot work die steel with high thermal strength and high toughness and its tempering process. (2) Background technology [0002] With the development of the automobile industry and related industries, the processing requirements for spare parts are getting higher and higher, and many spare parts have been produced by non-cutting molds. The performance requirements for hot work die steel are: high thermal stability, high temperature resistance strength and sufficient toughness, good cold and heat fatigue resistance, good oxidation resistance and corrosion resistance. [0003] The hot work mold is subjected to a lot of pressure and impact load during work, and the impact frequency is very high. The mold cavity is in contact with high-temperature metal, and it has to undergo repeated heating and cooling. Thermal fatigue cracks occur on the working surface of the working surface. In addition, when the hot metal is forced to d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/30C21D6/00C21D1/26
Inventor 吕广奇陆文捷
Owner ZHEJIANG ZHENGDA MOLD
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