About 800℃. According to relevant data, the rolling process requirements are as follows: the thickness tolerance of each point of CDEFGH is 0.15 mm; The detection conditions are: the length and thickness are detected online in hot state, and the reed temperature is about 800℃. Automobile leaf springs should be manufactured through various processes. Specifically, it should be manufactured through blanking, straightening, drilling, ear rolling, quenching, tempering at medium temperature, shot peening, assembly and pre-tightening.