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Fully annealed steel is soft and ductile during heated operation with critical temperature where  the furnace is turned off with the steel still inside. This assures all the ferrite transforms into austenite then cooled slowly with no internal stresses and is held for sufficient time , which is often necessary for cost-effective forming.. It creates an entirely new homogeneous and uniform structure with good dynamic properties. Only spheroidized steel is softer and more ductile