The heat treatment process of carbon structural steel plates usually includes annealing, normalizing, quenching and tempering.

Annealing improves the workability of steel, increases toughness, and gives the steel a more uniform structure. Normalizing can improve the grain structure and increase its mechanical properties. Quenching increases the hardness of steel but usually reduces its toughness. Tempering reduces the hardness of quenched steel while increasing its toughness.

The heat treatment process of carbon structural steel plates usually includes annealing, normalizing and quenching.

The purpose of annealing is to eliminate the internal stress of the steel plate, improve the workability of the steel, increase the toughness, and give the steel a more uniform structure. This treatment is typically used on cold-worked steel.

Normalizing is designed to increase the hardness and strength of steel and improve the grain structure to make it more uniform. This treatment is commonly used on medium and high carbon steels to increase their mechanical properties.

The purpose of quenching is to increase the hardness of the steel but usually reduces its toughness. Quenched steel is usually very hard but can also become brittle, so subsequent tempering is often required to improve toughness.

Tempering reduces the hardness of quenched steel while increasing its toughness to make the steel more suitable for specific applications.

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