Ultra quick quenching oil and preparation method thereof

Abstract

The invention relates to ultra quick quenching oil and a preparation method thereof. The ultra quick quenching oil comprises the following raw materials in percentage by weight: 80 to 97 percent of refined mineral oil, 1 to 10 percent of cooling catalyst, 1 to 5 percent of antioxidant and 1 to 6 percent of anionic surfactant. The kinematic viscosity of the refined mineral oil at the temperature of 40 DEG C is 6 to 9 mm<2> / s; the cooling catalyst is a mixture of oily phenolic resin and polybutylene; the antioxidant is alkylated diphenylamine; and the anionic surfactant is petroleum sodium sulfonate. The preparation method of the ultra quick quenching oil is simple and convenient; the obtained quenching oil has the advantages of ultra high cooling speed, good thermal oxidation stability, long service life and continuous and stable property retention; little peculiar smell, smog and carbon deposit are produced, and the take-out consumption of a workpiece is low; and after the workpiece is quenched by adopting the quenching oil, the workpiece has the advantages of high and uniform surface hardness, deep quenching layer, low deformation, metallographic structure, good mechanical property and good brightness, the surface of the workpiece does not become black, and the workpiece is easily cleaned.

Description

technical field [0001] The invention relates to an ultra-rapid quenching oil and a preparation method thereof, which can be applied to various low-hardenability steels. Background technique [0002] Chemical heat treatment is a heat treatment process that puts a metal or alloy workpiece in an active medium at a certain temperature to keep one or several elements infiltrated into its surface to change its chemical composition, structure and performance. Chemical heat treatment uses chemical reactions and sometimes physical methods to change the chemical composition and structure of the steel surface in order to obtain a metal heat treatment process with better technical and economic benefits than homogeneous materials. Since most of the failure and damage of mechanical parts germinate in the surface layer, especially for parts that may cause wear, fatigue, metal corrosion, oxidation and other conditions, the performance of the surface layer is particularly important. [0003...

AI Technical Summary

Problems solved by technology

[0014] 1. The steam film stage lasts for a long time, which will cause the parts to be quenched and cooled: uneven cooling, uneven hardness of parts, large quenching deformation; and the parts cannot meet the required mechanical properties after quenching

[0015] 2. The effective life is short, the reason is:

[0016] (1) The existing technology uses high-molecular hydrocarbons that are easily decomposed by heat as refrigerants. Polyisobutene and its derivatives are commonly used in China. They are directly decomposed by heat to shorten and destroy the steam film and increase the cooling rate. However, the decomposed products are Lost the original performance

That is to say, the instability of additives causes the cooling performance of most existing quenching oils to change in a short period of time.

[0017] (2) The current oil basically adopts the normal temperature antioxidant of traditional industrial lubricating oil, such as 2,6 di-tert-butyl-p-cresol, referred to as BHT, which is mostly used for anti-oxidation in lubricating oils in normal temperature working environments such as hydraulic oil and gear oil. Additives, the effect of which is very small in the high-temperature working state of the quenching oil under the impact of high-temperature red-hot parts, and cannot effectively resist high-temperature oxidation, so that the quenching oil ages quickly-main performance: the acid value and Viscosity increases rapidly, cooling rate rapidly slows down