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Annealed Steel Strips

Annealed steel coils are produced by the process of annealing which is a type of heat treatment wherein the steel strips are altered, causing changes in its properties such as strength and hardness. Hard Strips (India) manufactures annealed steel coils in the following manner. Firstly heating is done above the recrystallization temperature and a suitable temperature is maintained, and then after this cooling is done. Annealed steel strips are ductile, soft, relieved from internal stresses and have a refined structure which is done by making it homogeneous. Thus the steel strips are softened and prepared for further work such as shaping, stamping, or forming.

There are three stages through which annealed steel strips are manufactured through the annealing process. Firstly there is a recovery phase, which results in softening of the metal through removal of crystal defects and the internal stresses which they cause. Recovery phase covers all annealing phenomena that occur before the appearance of new strain-free grains. The second stage is recrystallization, where the new strain-free grains nucleate and grow to replace those deformed by internal stresses. If annealing is allowed to continue once recrystallization has been completed, grain growth will occur, in which the microstructure starts to coarsen and may cause the steel strips to have less than satisfactory mechanical properties.