Induction annealing actually means induction normalizing, because the workpiece is cooled in the air after being heated to the annealing temperature, but it is customarily called annealing. Induction annealing has many benefits and it is often used after induction hardening to improve the properties of the steel.

The benefits of induction annealing

Benefits of induction annealing

  • Reduce the hardness of steel, improve plasticity, facilitate machining and cold deformation processing.
  • Homogenize the chemical composition and structure of steel, refine grains, improve the properties of steel or prepare structure for quenching.
  • Relieve internal stress and work hardening to prevent deformation and cracking.


Induction annealing is widely used in the heat treatment process of industrial parts.

  • Annealing of steel pipe welds (Read the benefits of steel pipe weld annealing).
  • Recrystallization annealing of workpieces after cold heading (such as annealing of high-pressure oil pipe connections).
  • local annealing of some workpieces after carburizing (such as motorcycle connecting rods and spline shaft threads).

Effects of induction annealing on workpieces

  • Annealing of steel pipe welds can normalize the coarse and uneven grains of the welds into fine ones.
  • Local annealing of cold heading workpieces can restore the elongated grains after cold heading to fine and uniform ones, to avoid damage to the corresponding part of the workpieces due to the degradation of mechanical properties during use.
  • Local annealing of carburized parts, such as the threaded part, is mainly to reduce the hardness of the corresponding part.

FOCO induction annealing machine

When the induction heating machine of FOCO induction is used for induction annealing, the power of the machine can be adjusted according to the process needs of the annealing workpiece. Induction annealing equipment can be equipped with infrared temperature detectors, automated loading and unloading systems.

  • Precise control of the annealing process
  • Automation of the production process
  • Improve production quality and productivity