Environment-friendly water-soluble quenching liquid

Abstract

The invention relates to an environment-friendly water-soluble quenching liquid which is suitable for quenching carbon steel and alloy steel workpieces and belongs to the technical field of quenching medium. The invention is the improvement on the basis of taking water as a quenching medium. Sodium chloride, potassium chloride and sodium nitrate are added to the water in a certain proportion and dissolved; after a high-temperature workpiece is soaked into the cooling medium, crystal in which salts are separated out at the steam film stage immediately bursts to destroy the steam film and also scrap the oxide skin of the surface of the workpiece, so that the cooling ability of the medium at a high-temperature area can be improved; the cooling speed being approximate to that of water, or between that of water and oil and being equivalent to that of oil or the lower cooling speed can be obtained so as to meet the quenching demands of different materials and workpieces. The aqueous quenching agent has no toxin, no smoke, no corrosivity, no combustion, safe use and no environmental pollution. Utilizing the quenching liquid to quench instead of machine oil can reduce the processing cost by about 80 percent; moreover, the workpiece is clean and sanitary and has a certain rust-proof ability.

Description

technical field [0001] The invention relates to an environment-friendly water-soluble quenching liquid, which is suitable for quenching carbon steel and alloy steel workpieces and belongs to the technical field of quenching media. Background technique [0002] In the heat treatment production process of springs, it is often found that if some steel types are cooled by oil, their hardenability is poor, the quenching hardness is low, and the grain size inspection does not meet the standard requirements. The improvement of product quality is closely related to the quality of heat treatment. Due to the slow cooling rate of oil, it is difficult to meet the hardening requirements. However, the water cooling speed is fast, and the workpiece is easy to harden but is prone to cracks. [0003] The same batch of materials are subjected to the same heat treatment according to the normal heat treatment method, and then cooled by water and oil quenching media respectively. After the meta...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of environment-friendly water-soluble quenching liquid, solve the problem that the core of the existing material quenched by oil medium obviously produces acicular and massive ferrite, the metallographic phase is 60% tempered troostite, and The metallographic phase of the water quenching material is more than 75% tempered troostite. After the comparison test, the water quenching is obviously better than the oil quenching, but it has defects, which cannot be controlled and meet the ideal requirements; the invention can satisfy the quenching of the material. The permeability can control the hardenability of the material so that the material does not produce cracks

Images