A heat treatment to improve the toughness of steel. Normalizing is a heat treatment to improve the toughness of steel. After heating the steel component to 30-50℃ above the Ac3 temperature, keep it warm for a period of time and then air cool it out of the furnace. The main feature is that the cooling speed is faster than annealing but lower than quenching. After keeping warm for an appropriate time for complete austenitization, it is cooled at a faster speed (air cooling, wind cooling or spraying) to obtain a heat treatment process of pearlite-like structure. The essence of the normalizing process is complete austenitization plus pseudo-eutectoid transformation.
Purpose: The main purpose of normalizing is to refine the metal structure grains, uniform composition and structure, eliminate internal stress, adjust hardness, eliminate defects such as Widmanstatten structure, banded structure, and network carbide, and provide a suitable organizational state for the final heat treatment.
Application:
1. Improve the cutting performance of low carbon steel.
2. Eliminate hot working defects of medium carbon steel (Widmanstätten structure, banded structure, coarse grains)
3. Eliminate network carbides of hypereutectoid steel, facilitate spheroidizing annealing, and prepare the structure for quenching.
4. As the final heat treatment, improve the mechanical properties of ordinary structural parts.
Round Carbon Steel Tube
