Most automotive structural parts are hot forged. How to use the residual heat of casting to heat the blank is an important measure for energy saving. If forging isothermal annealing and casting residual heat quenching, the microstructure and hardness required for subsequent processing can be obtained, and the energy consumption for reheating heat treatment can be saved, and the energy saving effect is remarkable. Parts that are heat treated by forging residual heat have various types of gear blanks, front axles, steering knuckles, rocker arms, spline shafts, crankshafts, connecting rods, and the like. For the isothermal annealing of the gear, in order to ensure the uniformity of the structure and hardness of the forging heat treatment, it is necessary to strictly control the final forging temperature, the intermediate cooling process, the isothermal temperature and the like. For the heat-hardened parts, in order to ensure the toughness of the parts, in addition to the direct quenching process, it is also possible to pre-cool to 550-650 ° C to complete the pearlite transformation and then reheat to the austenitizing temperature. The main purpose is to refine the structure and obtain good toughness.
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