Vacuum Heat Treatment Process Parameters of Spring Steel

The spring material requires high tensile strength and yield ratio, high elastic limit, high notch fatigue strength and sufficient toughness after heat treatment. The main form of failure of the spring during service is fatigue fracture. Defects such as oxidation, decarburization, cracks and scars on the spring surface can seriously affect the fatigue life of the spring. And use air resistance furnace or salt bath furnace for heating and quenching,Inevitably, oxidation, decarburization and surface alloying element depletion will occur. If vacuum heat treatment is used, such defects can be effectively avoided. In addition, the beneficial effect of vacuum degassing on improving the toughness of the material can further improve the fatigue life and reliability of the spring. The vacuum heat treatment of spring steel is generally limited to some high-quality spring steel wires. Important springs, precision spring elements made of steel plates, spring sheets made of thin spring steel strips and other workpieces.

Commonly used spring steel vacuum heat treatment process specifications are shown in Table 1. Considering that the alloy elements in spring steel include manganese and chromium with higher vapor pressure, the vacuum degree during quenching heating in vacuum heat treatment of manganese and silico-manganese spring steel It should not be higher than 133X10-2Pa, and the vacuum degree of chromium-containing spring steel during quenching and heating should not exceed 133X 10-3Pa. 65Mn, 60Si2MnA and 60Si2CrVA steels have temper brittleness and should be forced to circulate and cool in inert gas after vacuum tempering.

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