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
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[0018] Example 1
[0019] When preparing the water-soluble quenching medium stock solution of the present invention, the water needs to be pre-heated to 40-60°C, and the relevant components can be added under stirring. For example: polyether with a molecular weight of 4000~15000 is 49%, polyoxyethylene C 8-10 The alcohol ether surfactant is 0.05%, sodium nitrate 2.0%, potassium hydroxide 0.6%, bactericide 1-chloro-2-methyl-3-isothiazolone 200 ppm, tap water 48%.
Example Embodiment
[0020] Example 2
[0021] The silver probe method was used to measure and compare the physical and chemical indexes and cooling curves of a domestic water-soluble quenching medium A, UCON A polyether water-soluble quenching medium, the water-soluble quenching medium of the present invention, and several other quenching media. As shown in Table 1.
[0022]
Example Embodiment
[0023] Example 3
[0024] Simulate hardenability test. The heating equipment for the quenched parts is a box-type resistance furnace. The material of the quenched specimen is 40Cr, and the blanks of automobile parts (knuckle arm and steering arm) are directly used for testing. The heating temperature of the quenched parts is 830°C, holding for 50 minutes, the tempering heating temperature is 630°C, holding for 120 minutes, and the quantity of water-soluble quenching medium is 300 kg.
[0025] Table 2 shows the surface hardness of the steering knuckle arm specimens quenched with 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
[0027] Table 3 shows the test...
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