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Annealing of Cold Rolled Steel

Batch Annealing

Annealing of cold rolled steel involves a time and temperature controlled thermomechanical process used predominantly to make steel soft again after cold reduction.

Cold reduction or work hardening makes steel grain structure small and elongated.

This produces high strength, but low elongation. Annealing recrystallizes the grain structure restoring ductility so the material can adequately bend for its intended application. Higher temperature longer cycle time annealing can be used to make medium and high carbon steels extra soft by spheroidization.

This process converts plate-like iron carbide in the steel’s microstructure into balls for easier formability. Certain hot roll grades can also be annealed for more uniform property control and a residual stress-free product.

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Annealing of Cold Rolled Steel

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