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Hot-work die steel and heat treatment method thereof

A heat treatment method and technology for hot work die steel, applied in the direction of improving energy efficiency and process efficiency, etc., can solve the problems of grain coarsening, toughness decrease, and low potential for high temperature strength of hot work die steel. Small grain size, improved high temperature strength, good tempering stability

Active Publication Date: 2019-11-12
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the solid solubility of the material is increased by increasing the quenching holding temperature and extending the holding time, the high temperature strength of the material can be improved, but this process will cause the grain of the material to coarsen and the toughness will decrease
Therefore, the existing technology has little potential to improve the high temperature strength of hot work die steel without reducing the toughness of the material.

Method used

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  • Hot-work die steel and heat treatment method thereof
  • Hot-work die steel and heat treatment method thereof
  • Hot-work die steel and heat treatment method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] This embodiment provides a heat treatment method for hot work die steel. The die steel used in this embodiment is heat-resistant and wear-resistant steel 25Cr3Mo2WNiVNb with a specification of φ20×100 mm.

[0066] The heat treatment method comprises the steps of:

[0067] 1) Place the mold steel in the induction coil, heat up to 1100°C in 6 minutes, and keep it warm for 6 minutes;

[0068] 2) Cool the mold steel after heat preservation to about 150°C and take it out;

[0069] 3) Tempering the quenched die steel at 640° C. for 4 hours.

[0070] The metallographic structure after tempering is as figure 1 (a) shown.

[0071] Wherein, described steel 25Cr3Mo2WNiWVNb is prepared by following method:

[0072] ①Through vacuum melting technology, according to the mass percentage of components: C: 0.25-0.32wt%; Cr: 2.5-3.2wt%; Mo: 1.6-2.5wt%; W: 0.2-1.0wt%; Ni: 0.5-1.5wt% ; V: 0.2-1.0wt%; Nb: ≤0.1wt%; Si: ≤0.1wt%; Then it is forged into an electrode rod in a forging furnac...

Embodiment 2

[0077] This embodiment provides a heat treatment method for hot work die steel. The die steel used in this embodiment is heat-resistant and wear-resistant steel 25Cr3Mo2WNiVNb with a specification of φ20×100 mm (prepared by the method disclosed in Embodiment 1).

[0078] The heat treatment method comprises the steps of:

[0079] 1) Place the mold steel in the induction coil, heat up to 1150°C in 6 minutes, and keep it warm for 3 minutes;

[0080] 2) Cool the mold steel after heat preservation to about 150°C and take it out;

[0081] 3) Tempering the quenched die steel at 640° C. for 4 hours.

[0082] The metallographic structure after tempering is as figure 1 (b) shown.

Embodiment 3

[0084] This embodiment provides a heat treatment method for hot work die steel. The die steel used in this embodiment is heat-resistant and wear-resistant steel 25Cr3Mo2WNiVNb with a specification of φ40×100 mm (prepared by the method disclosed in Embodiment 1).

[0085] The heat treatment method comprises the steps of:

[0086] 1) Place the mold steel in the induction coil, heat up to 1100°C in 10 minutes, and keep it warm for 3 minutes;

[0087] 2) Cool the mold steel after heat preservation to about 150°C and take it out;

[0088] 3) Tempering the quenched die steel at 640° C. for 4 hours.

[0089] The metallographic structure after tempering is as figure 1 (c) shown.

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Abstract

The invention relates to the field of metal material heat treatment, in particular to hot-work die steel and a heat treatment method thereof. The heat treatment method comprises the following steps of1), heating the die steel at rate of 80-180 DEG C / min to 1100D EG C-1300 DEG C, and carrying out heat preservation for 3-10 minutes; 2), quenching the die steel after heat preservation in a quenchingmedium; and 3), tempering the quenched die steel. According to the method, the obtained hot-work die steel grains are not coarsening, the carbides are more dispersed and distributed, the tempering stability is good, the high temperature strength at the same hardness after processing is greatly improved, the thermal fatigue performance of the die steel is improved, after the heat treatment is performed to the same hardness, the impact toughness of the die steel after the new process is slightly higher than that of the traditional process, the method greatly shortens the heating and heat preservation time in the quenching process, and can achieve the effects of saving time and cost for small-batch and small-sized products.

Description

technical field [0001] The invention relates to the field of heat treatment of metal materials, in particular to a hot work die steel and a heat treatment method thereof. Background technique [0002] As an important part of die steel, hot work die steel is mainly used to manufacture dies that are pressed and formed from solid metal or high-temperature liquid metal heated to above the recrystallization temperature. The working characteristics of hot work die steel are: under a certain load, the hot solid metal can be plastically deformed, or the high-temperature liquid metal can be die-cast into shape. Therefore, the high temperature strength of hot work die steel is an important factor in the service life of the die. Moreover, during use, the hot work die steel must have a certain degree of toughness, and high toughness can ensure that the material will not be brittle during service. Therefore, the high temperature strength of hot work die steel can be improved, but at th...

Claims

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Application Information

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IPC IPC(8): C21D6/00C21D1/18C22B9/18C22C38/02C22C38/04C22C38/44C22C38/46C22C38/48
CPCC21D1/18C21D6/004C21D6/005C21D6/008C22B9/18C22C38/02C22C38/04C22C38/44C22C38/46C22C38/48Y02P10/25
Inventor 黄进峰赵超张津连勇张尊君
Owner UNIV OF SCI & TECH BEIJING
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