Why do flanges need heat treatment?
Heat treatment can generally be divided into two types according to process: preliminary heat treatment and final heat treatment. Generally, heat treatment will not change the shape and overall chemical composition of the workpiece, but will endow or improve the performance of the workpiece by changing the internal microstructure of the workpiece or changing the chemical composition of the workpiece surface. The purposes of the two kinds of heat treatment are also different.
The purpose of preparatory heat treatment is to improve the workability, eliminate internal stress and prepare a good metallurgical structure for final heat treatment. Heat treatment process includes annealing, normalizing, aging, quenching and tempering. The purpose of final heat treatment is to improve mechanical properties, such as hardness, wear resistance and strength.
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