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Tempering Method and Purpose of Vacuum Tempering Furnace

Tempering operations can generally be divided into three categories: high temperature tempering, which refers to tempering at a temperature below the A1 line to 500°C; medium temperature tempering, which refers to tempering at a temperature in the range of 250 to 500°C; low temperature tempering, Refers to tempering at a temperature below 250°C. The following is the specific introduction of the three tempering methods of the vacuum tempering furnace by the relevant technical personnel of Hunan Dingli Technology.

1. High Temperature Tempering

The purpose of high-temperature tempering is to obtain a tempered sorbite or pearlite-based structure to obtain good comprehensive mechanical properties (both higher hardness and strength, but also better plasticity and toughness). Therefore, high temperature tempering is often used as a quenching and tempering process (ie quenching and high temperature tempering). In addition, it can also be used for parts in the unquenched state to eliminate stress and prevent deformation, such as welding structural parts to eliminate welding stress. High temperature tempering is also used as an intermediate process of surface quenching and rework treatment to eliminate stress, reduce hardness, and replace the annealing process. High temperature tempering is used after normalizing to reduce hardness and improve cutting performance. High temperature tempering can also be used as a pretreatment process for complex parts and parts made of high alloy steel before heat treatment (including carburizing, etc.).

2.Medium Temperature Tempering

Chinese tempering can ensure that the parts have higher elastic limit and fatigue resistance. At this time, the metallographic structure of the parts is tempered troostite or tempered sorbite. According to this characteristic, medium temperature tempering is often used in the heat treatment of springs, high-strength gears, hammer skewers, molds, wheels of high-speed vehicles (commonly known as cranes, cranes) and other wheel treads.

3. Low Temperature Tempering

The structure obtained by low temperature tempering is tempered martensite or tempered martensite plus tempered troostite. Generally speaking, this kind of tempering does not reduce or lessen the hardness. Its purpose is mainly to eliminate stress. Therefore, this kind of tempering is used for parts that require high hardness and high wear resistance, such as high-speed gears, uranium bearings, etc. .