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Annealing, normalizing, quenching, and tempering are the "four fires" of carbon steel plate in the overall heat treatment. Among them, quenching and tempering are closely related, and they are often used together, and both are indispensable. "Four fires" have evolved different heat treatment processes with different heating temperatures and cooling methods.
1. Normalizing is a heat treatment process in which steel or steel parts are heated to an appropriate temperature above the critical point AC3 or ACM and kept for a certain period of time and then cooled in air to obtain pearlite-like structures.
2. Annealing: Heat the hypoeutectoid steel workpiece to 20-40 degrees above AC3, hold it for a period of time, and then slowly cool it with the furnace (or bury it in sand or lime) to below 500 degrees and cool it in the air.
3. Quenching: A heat treatment process in which the steel is austenitized and then cooled at an appropriate cooling rate to cause the workpiece to undergo martensite and other unstable structural transformations in the entire cross-section or within a certain range.
4. Tempering: Heat the quenched workpiece to an appropriate temperature below the critical point AC1 for a certain period of time, and then cool it by a method that meets the requirements to obtain the required structure and properties.
Carbon steel plate plays an important role in our industrial life,and will provide humans more and more benefits.