Quenching cooling method for 5CrNiMoV module

A cooling method and quenching furnace technology, applied in the field of alloy steel quenching and cooling, can solve the problems of reduced service life of modules, insufficient cooling speed of oil-cooled quenching, and large difference in hardness between core and surface, so as to reduce the hardness difference and reduce quenching. The effect of cracking risk

CN114350903APending Publication Date: 2022-04-15WUXI TURBINE BLADE
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2022-04-15

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Abstract

The invention provides a quenching cooling method of a 5CrNiMoV module, which can effectively improve the quenching effect of the 5CrNiMoV large module, reduce the difference of core hardness and surface hardness, and reduce the risk of quenching cracking. A quenching cooling method for a 5CrNiMoV module is characterized by comprising the following steps: 1) quenching furnace heat treatment: the effective thickness of the 5CrNiMoV module is controlled to be 150-300 mm, the temperature is increased to 650 DEG C along with the furnace, the heat preservation time is 0.4-0.6 min / mm, the temperature is continuously increased to 840-880 DEG C, and the heat preservation time is 1.0-1.5 min / mm; and (2) combined cooling treatment is conducted, specifically, air cooling, water cooling and oil cooling are sequentially conducted after discharging, the air cooling speed is 50-70 DEG C / min, the air cooling time is 1-2 min / 100 mm, the water cooling speed is 100-150 DEG C / min, the water cooling time is 1-2 min / 100 mm, the oil cooling speed is 15-25 DEG C / min, and the oil cooling time is 10-15 min / 100 mm.
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Description

technical field

[0001] The invention relates to the technical field of alloy steel quenching and cooling, in particular to a quenching and cooling method for a 5CrNiMoV module. Background technique

[0002] The module hardenability of 5CrNiMoV material is relatively poor, and the quenching size effect is relatively sensitive. When the effective thickness of the module exceeds 150mm, conventional quenching and cooling technologies have problems to varying degrees, and the risk of cracking in salt water or water quenching is relatively high. The speed is insufficient, the hardness difference between the core and the surface is large, and the service life of the module is reduced. This is a common problem encountered by low-alloy die steels with poor hardenability.

[0003] The chemical composition of 5CrNiMoV is shown in the table below.

[0004] Contents of the invention

[0005] The invention provides a quenching and cooling method for a 5CrNiMoV module, which can effe...

Examples

Embodiment 1

[0012] The 5CrNiMoV modules undergo heat treatment, including quenching and tempering.

[0013] 1. Quenching:

[0014] 1) The module is installed in the furnace, and the temperature is raised to 650°C for 60 minutes with the furnace, and the temperature is continued to 840°C for 3.5 hours;

[0015] 2) Air cooling for 1.5 minutes, the average cooling rate of the module is 70°C / min, water cooling for 2 minutes, the average cooling rate of the module is 150°C / min, oil cooling for 15 minutes, the average cooling zone speed of the module is 24°C / min;

[0016] 2. Tempering: heat preservation at 580°C for 5 hours, then air cool to room temperature.

Embodiment 2

[0018] The 5CrNiMoV modules undergo heat treatment, including quenching and tempering.

[0019] 1. Quenching:

[0020] 1) The module is installed in the furnace, and the temperature is raised to 650°C for 60 minutes with the furnace, and the temperature is continued to 840°C for 3.5 hours;

[0021] 2) Air cooling for 2 minutes, the average cooling rate of the module is 50°C / min, water cooling for 3 minutes, the average cooling rate of the module is 100°C / min, oil cooling for 22.5 minutes, the average cooling zone speed of the module is 16°C / min;

[0022] 2. Tempering: heat preservation at 580°C for 5 hours, then air cool to room temperature.

Embodiment 3

[0024] The 5CrNiMoV modules undergo heat treatment, including quenching and tempering.

[0025] 1. Quenching:

[0026] 1) The module is installed in the furnace, and the temperature is raised to 650°C for 60 minutes, and the temperature is continued to 880°C for 3.5 hours.

[0027] 2) Air cooling for 2 minutes, the average cooling rate of the module is 50°C / min, water cooling for 3 minutes, the average cooling rate of the module is 100°C / min, oil cooling for 22.5 minutes, the average cooling zone speed of the module is 16°C / min; then keep at 580°C for 5 hours air cooled.

[0028] 2. Tempering: heat preservation at 580°C for 5 hours, then air cool to room temperature.