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A Vacuum Quenching Heat Treatment Process for Thin Stainless Steel Parts

A vacuum quenching and stainless steel technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems affecting workpiece deformation and surface finish, cannot guarantee workpiece deformation, equipment damage, etc., to reduce labor intensity of workers, Reduce the labor intensity of workers and reduce the effect of equipment damage

Active Publication Date: 2016-10-05
广州市广智机电工业研究所有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used alloying elements such as Zn, Mg, Mn, Al, Cr, etc. have high vapor pressure and are easy to evaporate. The evaporation of the metal will cause the surface of the adjacent workpiece to bond, and it is extremely difficult to disassemble after quenching. Even if it is barely disassembled, it will seriously affect the workpiece. Distortion and surface finish, even scrapping
In order to solve the problem of adhesion, the current common practice is to sprinkle a layer of quartz powder between the thin workpieces and then use the clamping quenching method. Although this method solves the problem of adhesion between the workpieces, it cannot guarantee the deformation of the workpieces. amount, and in the process of vacuum heating, it is easy to pump the quartz powder into the vacuum equipment, causing damage to the equipment

Method used

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  • A Vacuum Quenching Heat Treatment Process for Thin Stainless Steel Parts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Select 1000 experimental workpieces of ф150mm×ф10mm×thickness 0.8mm, and the material is 3Cr13 for quenching treatment. The heat treatment process is as follows:

[0026] 1. Oxidize the workpiece in an air furnace at 520°C for 3 hours;

[0027] 2. Stack the workpiece on the flat backing plate, and press the surface with a suitable weight of the grinding block;

[0028] 3. Put it into a vacuum air quenching furnace and heat it up to 1030°C for 120 minutes;

[0029] 4. Keep the workpiece under the pressure of 0.4MPa for 1 hour;

[0030] 5. Cool the workpiece out of the furnace to room temperature and then temper;

[0031] 6. Temper twice at 180°C, and keep warm for 3 hours each time.

[0032] In the present embodiment, the technical parameters obtained after the heat treatment of the 3Cr13 sheet workpiece are as follows:

[0033] 1. Surface hardness: 51-53HRC

[0034] 2. Maximum deformation: 0.08mm

[0035] 3. Deformation qualified rate: 100%

[0036] 4. Difficulty...

Embodiment 2

[0040] Select 1,000 experimental workpieces with a length of 300mm×width 100mm×thickness 1mm, and the material is 316L for solution treatment. The heat treatment process is as follows:

[0041] 1. Oxidize the workpiece in an air furnace at 520°C for 3 hours.

[0042] 2. Stack the workpiece on the flat backing plate, and press the surface with a suitable weight of the grinding block.

[0043] 3. Put it into a vacuum air quenching furnace and raise the temperature to 1050°C for 120 minutes.

[0044] 4. Air-cool the workpiece under 0.4MPa pressure for 1 hour.

[0045] 5. Take the workpiece out of the furnace and air cool to room temperature.

[0046] In the present embodiment, the technical parameters obtained after the solution treatment of the 316L sheet workpiece are as follows:

[0047] 1. Hardness: 95-125HB

[0048] 2. Maximum deformation: 0.1mm

[0049] 3. Deformation qualified rate: 100%

[0050] 4. Difficulty of splitting: After tempering, tap the wooden board light...

Embodiment 3

[0055] Select 1,000 experimental workpieces with a length of 500mm×width 400mm×thickness 3mm, and the material is 17-4PH for solution-aging treatment. The heat treatment process is as follows:

[0056] 1. Oxidize the workpiece in an air furnace at 520°C for 3 hours.

[0057] 2. Stack the workpiece on the flat backing plate, and press the surface with a suitable weight of the grinding block.

[0058]3. Put it into a vacuum air quenching furnace and heat it up to 1040°C for 120 minutes.

[0059] 4. Air-cool the workpiece under 0.4MPa pressure for 1 hour.

[0060] 5. Take the workpiece out of the oven and air cool it to room temperature for aging treatment.

[0061] 6. Heat to 480°C for 4 hours.

[0062] In the present embodiment, the technical parameters obtained after the solution-aging treatment to the 17-4PH sheet workpiece are as follows:

[0063] 1. Hardness: 44-46HRC

[0064] 2. Maximum deformation: 0.15mm

[0065] 3. Deformation qualified rate: 100%

[0066] 4. Dif...

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Abstract

The invention discloses a vacuum quenching thermal treatment process for stainless steel thin parts. The process comprises the following steps: S10, oxidizing workpieces at 500-600 DEG C; S20, stacking the oxidized workpieces on a polished flat base plate and placing a flatting pressure block on the top surface of the stacked workpieces; and S30, after vacuum quenching the workpieces on the base plate, tempering the workpieces. The thermal treatment process which overcomes adhesion of the stainless steel thin parts quenched in vacuum can be used for reducing deformation of the thin part workpieces and ensuring the surface smoothness of the workpieces when the stainless steel thin parts are quenched in vacuum; the quenched workpieces are easy to split, so that the product yield is improved, the maintenance cost of equipment is lowered, the labor intensity of workers is alleviated, and the production efficiency is improved. Therefore, a vacuum gas quenching technology is applied to a stainless steel thin part workpiece with special requirements on hardness, precision and smoothness after thermal treatment, so that the application of martensitic grade stainless steel is further expanded. The thermal treatment process which overcomes adhesion of the stainless steel thin parts quenched in vacuum has the remarkable technical progress and is optimistic in economic value and market prospect.

Description

technical field [0001] The invention is used in the technical field of steel heat treatment, and in particular relates to a vacuum quenching heat treatment process for thin stainless steel parts. Background technique [0002] The quenching of carbon fiber steel is to heat the steel to a temperature above the critical temperature Ac3 (hypoeutectoid steel) or Ac1 (hypereutectoid steel), keep it warm for a period of time to make it fully or partially austenitized, and then cool it at a temperature greater than the critical cooling rate. Rapid cooling to below Ms (or isothermal near Ms) for martensite (or Bainite ) transformed heat treatment process . The purpose of quenching is to make supercooled austenite undergo martensitic or Bainite transformation, to obtain martensite or bainite structure, and then cooperate with different temperature Temper , to greatly increase the strength of steel, hardness , wear resistance, fatigue strength and toughness, etc., so as to me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/00C21D1/18C21D1/773
CPCC21D1/18C21D1/773C21D9/00C21D2211/008
Inventor 张小聪焦国祥陈国辉
Owner 广州市广智机电工业研究所有限公司