Water soluble environment protection hardening media

Abstract

The invention relates to a water-soluble quenching medium, which is especially suitable for heating and quenching in a salt melting furnace. The water-soluble inorganic quenching medium is composed of cellulose with a molecular weight of 15000-30000, sodium chloride, potassium chloride and water. The weight ratio of the components is as follows: CMC 1.2-15%, NaCl 20-30 %, KCl 8-20%, H2O 40-60%, the sum of the weight percentages of each component is 100%; the above-mentioned raw materials are measured by percentage and placed in a container and stirred until they are completely dissolved. The present invention improves the quenching quality and improves the gold phase structure, the quenching effect is obviously better than that of N32 ordinary engine oil. Moreover, deterioration reactions such as oxidation or polymerization are not easy to occur, and the water-soluble quenching medium has no rust problem, no foam and deterioration problems, and does not need to be replaced. It is non-toxic, has no harmful smell, does not burn, reduces pollution, can eliminate fire hazards, and realizes safe and environmentally friendly production.

Description

technical field [0001] The invention relates to a water-soluble quenching medium, which belongs to the quenching medium for heat treatment, and is especially suitable for heating and quenching in a salt melting furnace. Background technique [0002] At present, the quenching medium used in the traditional heat treatment process is oil and tap water. Oil is used for medium-carbon low-alloy structural steel. Due to the slow cooling rate of oil, problems such as hard quenching or shallow hardened layer often occur. Water is used as the quenching medium. Due to the characteristics of water, the cooling speed is faster in the high temperature zone and the low temperature zone, and the steam film stage is too fast when the water temperature is increased. This process condition is difficult to control in production, that is, when the workpiece is cooled, the water temperature If it is too high, the cooling rate in the high temperature zone is slow, which may easily cause insuffici...

AI Technical Summary

Problems solved by technology

Water is used as the quenching medium. Due to the characteristics of water, the cooling speed is faster in the high temperature zone and the low temperature zone, and the steam film stage is too fast when the water temperature is increased. This process condition is difficult to control in production, that is, when the workpiece is cooled, the water temperature If it is too high, the cooling rate in the high temperature zone is slow, which may easily cause insufficient hardness; when the cooling rate in the low temperature zone is not high, the workpiece does not form quenched martensite and other reasons, resulting in unqualified hardness (unhardened). In short, due to the characteristics of water, Cracks in quenched workpieces cannot be avoided in production, and there are also problems such as quenching hardness or uneven quenching (quenching soft spots). At the same time, there are various types of water-soluble quenching media in the market, but they cannot be used for heating and quenching in salt melting furnaces.

For example, the application in the salt melting furnace will cause the quenching medium to deteriorate and cannot be heated and quenched, that is, the existing water-soluble quenching medium cannot be used in the salt melting furnace at all.

Images