Quenching is the rapid cooling of cold-rolled precision bright steel pipes in quenching media such as water, oil, other inorganic salts, and organic aqueous solutions after heating and heat preservation. After quenching, the cold-rolled precision bright steel pipe becomes hard, but at the same time it becomes brittle. In order to reduce the brittleness of the cold-rolled precision bright steel pipe, the quenched cold-rolled precision bright steel pipe is kept at an appropriate temperature higher than room temperature and lower than 650℃ for a long time, and then cooled. This process is called tempering . Annealing, normalizing, quenching, and tempering are the "four fires" in the overall heat treatment. Quenching and tempering are closely related and are often used in conjunction with each other.
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