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Water-based inorganic quenching medium

A quenching medium and inorganic technology, applied in the direction of quenching agent, heat treatment equipment, manufacturing tools, etc., can solve the problems of peculiar smell in the production process, difficult on-site maintenance, complex raw materials and preparation process, etc., and achieve low overall cost and small quenching stress , The effect of simple operation process

Pending Publication Date: 2019-08-02
FUJIAN UNIV OF TECH
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Problems solved by technology

[0004] Although the water-soluble polymer quenching medium that has been popularized and applied in recent years can realize adjustable cooling speed between water cooling and oil cooling, it is easy to breed bacteria, volatile substances in raw materials, odor during production, and organic matter on the working surface Deficiencies such as carbon residue, complex raw materials and preparation process, and difficulty in on-site maintenance

Method used

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  • Water-based inorganic quenching medium

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Embodiment Construction

[0028] (1) Composition and proportion of new water-based inorganic quenching medium

[0029] CaCl 2 :28~35wt%, ZnCl 2 :18~22wt%, MgCl 2 :5~8wt%, H 2 O margin. Among them, the three inorganic salts are anhydrous salts with a purity greater than 95%.

[0030] (2) Preparation of new water-based inorganic quenching medium

[0031] Sequentially add the corresponding mass percentage of CaCl in water 2 , ZnCl 2 and MgCl 2 (both are anhydrous inorganic salts), and stir while adding, until the above-mentioned various inorganic salts are completely dissolved in water.

[0032] (3) Physical and chemical properties of the new water-based inorganic quenching medium

[0033] Odorless, dark yellow, no sediment, density 1.49g / cm 3 , the boiling point is 120°C, and the pH value is 5~6 (weakly acidic).

[0034] (4) Cooling characteristics of new water-based inorganic quenching medium

[0035] The instrument for measuring the cooling characteristic curve of the quenching medium is th...

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Abstract

The invention relates to the field of metal heat treatment, in particular to a water-based inorganic quenching medium. According to the water-based inorganic quenching medium, the raw materials are simple; preparation and quenching operation technologies are simple and convenient; the quenching cooling characteristic is more close to an ideal quenching medium; on the basis that quenching structureand performance of a low-hardenability material such as ordinary carbon steel and the like are satisfied, quenching stress of a workpiece with a complex shape is effectively lowered; and deformationand cracking of the workpiece are avoided.

Description

technical field [0001] The invention relates to the field of metal heat treatment, in particular to a water-based inorganic quenching medium and a preparation method thereof. Background technique [0002] In order to obtain the expected carbon steel quenching structure (martensite, lower bainite), it is required to perform quenching treatment on carbon steel under the condition of greater than the critical cooling rate of carbon steel. However, when the quenching cooling rate is too large, it is easy to produce structural stress and thermal stress, which will lead to deformation and cracking of parts. In order to reduce the destructive effect of quenching stress, the ideal quenching medium needs to meet the cooling characteristics of "rapid cooling in high temperature zone (800℃~400℃) and slow cooling in low temperature zone (400℃~150℃)". Carbon steel and low-alloy steel have poor hardenability. When such materials are used to make workpieces with complex shapes and large t...

Claims

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Application Information

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IPC IPC(8): C21D1/60
CPCC21D1/60
Inventor 陈永禄洪丽华
Owner FUJIAN UNIV OF TECH
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