At present, there are two typical ways of connection between quenching and tempering steel connecting rod forging and heat treatment process.

1. Quenching and tempering is the final heat treatment. The main links of the process are: blanking → die forging → air cooling → normalizing → air cooling → quenching and tempering (quenching + high temperature tempering) → enhanced shot blasting → machining quenching and tempering: the steel parts are heated to a temperature above AC3 or AC1 for a certain time, then cooled at an appropriate speed to obtain martensite or bainite structure, and then heated to a temperature below AC1 for a certain time, The quenching and tempering heat treatment process, which is then cooled to room temperature, can make the steel parts obtain good microstructure and properties.
2. Taking forging residual heat quenching + high temperature tempering as the final heat treatment, the main links of the process are: blanking → die forging → forging residual heat quenching → high temperature tempering → shot blasting strengthening → mechanical processing forging residual heat quenching: it is a process of heating steel to a stable austenite state, plastic deformation at this temperature after heat preservation, and then pre cooling quenching to obtain martensitic structure, which is also called forging quenching. This is a process that combines pressure machining with heat treatment, and can obtain excellent mechanical properties and save energy.