In generally, the production of leaf spring needs steel belt with high toughness. But in the stretching and induction heat treatment, steel belt will suffer strong internal stress, which is not good for further processing. And it has very high hardness and brittleness, so leaf spring steel belt induction annealing can solve the defect with induction heating equipment.
Due to the use of induction heating machine with induction annealing, leaf spring steel belt can be heated evevly and continuously to a specified temperature, and then is carried out the insulation for some time, and then is slowly cooled in the air.
Because sometimes leaf spring needs steel belt is very thin and narrow, it requires that the machine must heat accurately the steel belt. What's more, this heating machine can contorl precisely the induction heating time and heating temperature. So the leaf spring steel belt has higher toughness to meet the requirement after induction annealing.