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Hot working die steel superfine heat treatment method

A heat treatment method and technology for hot work die steel, which can be used in heat treatment equipment, manufacturing tools, quenching agents, etc., and can solve problems such as serious pollution, high cost, and scrapping.

Active Publication Date: 2020-02-14
湖北日盛科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ultra-fine quenching of this kind of steel usually uses oil or a certain proportion of chemical fluid as the medium. The heat transfer of this kind of medium is slightly slow. During the quenching process, the steel can be hardened without cracking, but the cost is high and the pollution is serious. And it is purely quenched with water as the quenching medium, the hardenability is stronger than that of oil, and it is environmentally friendly.
However, if the control is not good, it is easy to cause the steel to crack and be scrapped.

Method used

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  • Hot working die steel superfine heat treatment method
  • Hot working die steel superfine heat treatment method
  • Hot working die steel superfine heat treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Taking H13 round steel as the processing object, the metallographic structure before the untreated H13 round steel, such as figure 1 shown. (AS15 grade 500×)

[0027] After forging, under the condition of being filled with inert gas, control the temperature at 860°C, keep it for 5 hours, then quickly cool it (cooling rate is 20°C / s) to 650°C, keep it for 6 hours; perform isothermal preheating, the preheating temperature is 660°C ;Rapid heating (heating rate: 1°C / min) to 1060°C, then keep warm for 20 minutes, then lower the temperature to below 1050°C, place in water, and cool. Next, it is finally cooled with the furnace to below 400°C.

[0028] The metallographic structure of the H13 round steel processed through the above steps, such as figure 2 shown. (AS3 level 500×)

Embodiment 2

[0030] Taking the 8418 plate as the processing object, the metallographic structure of the 8418 plate before treatment, such as image 3 shown. (AS18 grade 500×)

[0031] After forging, under the condition of being filled with inert gas, first control the temperature at 880°C, keep it warm for 10 hours, then quickly cool it (cooling rate is 50°C / s) to 690°C, keep it warm for 8 hours, then carry out isothermal preheating, rapid heating (heating The speed is 2°C / min) to 1060°C and then keep warm for 60 minutes, then lower the temperature to below 1050°C, place in water, and cool.

[0032] The metallographic structure of the 8418 plate after the above steps, such as Figure 4 shown. (AS2 level 500×)

Embodiment 3

[0034] Taking 5H12 round steel as the processing object, the metallographic structure before the untreated 5H12 round steel, such as Figure 5 shown. (AS13 grade 500×)

[0035] After forging, under the condition of being filled with inert gas, firstly control the temperature at 890°C, keep it warm for 6 hours, then quickly cool it (cooling rate is 50°C / s) to 680°C, keep it warm for 7 hours, and then carry out isothermal preheating, the preheating temperature is 1010°C; rapid heating (heating rate: 2°C / min) to 1060°C, then keep warm for 30 minutes, then lower the temperature to below 1050°C, place in water, and cool.

[0036] The metallographic structure of 5H12 round steel after the above steps, such as Figure 6 shown. (AS2 level 500×)

[0037] From the test of embodiment 1~embodiment 3, can find out. The hot work die steel treated by the method has significantly finer and more uniform particles than before treatment.

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Abstract

The application discloses a hot working die steel superfine heat treatment method. The method comprises the following steps: performing spheroidizing annealing and superfine quenching after forging, wherein the superfine quenching is carried out at the quenching temperature of 1040-1060 DEG C for 10-100min by taking water as a medium, and the spheroidizing annealing is carried out at the temperature of 860-900 DEG C for 10-24 hours. According to the method, the superfine heat treatment is carried out, water is used as the medium for quenching treatment, a hot working die steel band-shaped structure after the superfine heat treatment can meet the requirements of international standards, the requirements of the band-shaped structure of the SA-SB series with eight levels of requirements can be basically met, and a spheroidized structure can meet the requirements of five levels of AS1-AS5.

Description

technical field [0001] The present application relates to the technical field of metal heat treatment, in particular, to a method for superfine heat treatment of hot work die steel. Background technique [0002] Hot work molds are mainly used for hot deformation processing and pressure casting molds. After the hot work die is forged, it needs to be heat treated. Heat treatment is an indispensable and important process in the manufacture of hot work molds. The purpose of heat treatment is to change the structure of steel and improve the mechanical properties such as hardness and toughness by heating and cooling. Different heat treatment processes are adopted for different hot work dies to achieve the required performance. Heat treatment has an important influence on the quality and service life of hot work dies. [0003] After forging, the hot work die steel is subjected to spheroidizing annealing to ensure a certain hardness. After surface cleaning and tolerance control,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/18C21D1/32C21D1/60
CPCC21D1/18C21D1/32C21D1/60
Inventor 叶国梁陈雨飞
Owner 湖北日盛科技有限公司
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