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Water-soluble quenching medium

A quenching medium, water-soluble technology, applied in the direction of quenching agent, heat treatment equipment, manufacturing tools, etc., can solve problems such as uneven quenching, hard quenching, difficult control of process conditions, etc., achieve long life, improve metallographic structure, eliminate hidden effect

Inactive Publication Date: 2004-01-07
FAW GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the characteristics of water, the cooling rate is faster in the high-temperature area and the low-temperature area, and the steam film stage is too long when the water temperature is increased. This process condition is difficult to control in actual production, and it is impossible to avoid the phenomenon of cracks in quenched parts. At the same time, there are Quenching is not hard or uneven quenching (quenching soft point) and other problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The stock solution of the water-soluble quenching medium of the present invention needs to be pre-heated to 40-60°C when preparing the water, and all relevant ingredients can be added under stirring. For example: polyether with a molecular weight of 4000-15000 is 49%, polyoxyethylene C 8-10 Alcohol ether surfactant is 0.05%, sodium nitrate 2.0%, potassium hydroxide 0.6%, bactericide 1-chloro-2-methyl-3-isothiazolone 200ppm, tap water 48%.

Embodiment 2

[0021] The physical and chemical indexes and cooling curves of a domestic water-soluble quenching medium A, American UCON A polyether water-soluble quenching medium, the water-soluble quenching medium of the present invention and other quenching mediums were measured and compared by silver probe method. As shown in Table 1.

[0022]

Embodiment 3

[0024] Simulated hardenability test. The heating equipment for quenched parts is a box-type resistance furnace. The material of the quenched test piece is 40Cr, and the blank of the auto parts (steering knuckle arm and steering arm) is directly used for the test. The heating temperature of the quenching part is 830°C, and the heat preservation is 50 minutes. The tempering heating temperature is 630°C, and the heat preservation is 120 minutes. The quantity of the water-soluble quenching medium is 300 kg.

[0025] Table 2 shows the surface hardness of the steering knuckle arm specimen quenched into two different concentrations of quenching medium. From these tables, it can only be seen that the surface hardness value changes with the increase of the concentration, and the hardness can meet the requirements (d B =2.7~3.2), the hardness value of the water-soluble quenching medium of the present invention is also relatively uniform and stable.

[0026] media type

A ...

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PUM

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Abstract

The present invention relates to a water-soluble quenching medium. It is formed from proper quantity of polyether high-molecular mixture, surfactant, inorganist salt, sterilizing agent, inorganic alkali and water, and when it is concentration is 4-6%, it can be used for integrally quenching carbon steel, and when its concentration is 8-12%, it can be used for high-frequency quenching carbon steel, and it has the advantages of low use concentration, long service life and stable quenching quality.

Description

Technical field: [0001] The invention relates to a water-soluble quenching medium, which belongs to the quenching medium for heat treatment. Background technique: [0002] In recent years, the research on water-soluble quenching media in many developed countries has achieved rapid development, and various new types of water-soluble quenching media have emerged as the times require, and have been widely used in China, but the use concentration is generally high. For example, the water-soluble quenching A of an imported brand is recommended to be used at a concentration of 18-20% for overall quenching; the water-soluble quenching B of a joint venture brand is recommended to be used at a concentration of 12-16% for high-frequency quenching. [0003] At present, the quenching medium used in the traditional heat treatment process of parts is still mainly oil or tap water. Oil quenching is mainly used for medium-carbon low-alloy structural steel with a high tendency to quench cra...

Claims

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Application Information

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IPC IPC(8): C21D1/60
Inventor 张克金
Owner FAW GROUP
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