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A kind of superfine heat treatment method of hot work die steel

A heat treatment method and technology for hot-working die steel, applied in heat treatment equipment, manufacturing tools, quenching agents, etc., can solve the problems of slow heat transfer, steel cracking, high cost, etc., achieve finer and more uniform grain size, and accelerate cooling speed Effect

Active Publication Date: 2021-10-26
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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  • A kind of superfine heat treatment method of hot work die steel
  • A kind of superfine heat treatment method of hot work die steel
  • A kind of superfine heat treatment method of hot work die steel

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 present application discloses a method for superfine heat treatment of hot work die steel, which includes the following steps: performing spheroidizing annealing and superfine quenching after forging, the quenching temperature for superfine quenching is 1040°C to 1060°C, The medium is water, and the time is 10-100 minutes; the temperature of the spheroidizing annealing is 860-900° C., and the time is 10-24 hours. The present invention uses water as the medium for quenching treatment through ultra-fine heat treatment, and the steel band structure of the hot work die after ultra-fine heat treatment can not only meet the requirements of international standards, but also basically meet the requirements of eight levels of SA~SB series According to the requirements of banded organization, spheroidized organization can meet the requirements of five grades 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 Patents(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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