Annealing "Lessons in Steel"

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Heat Treatment Process of steel
The heat treatment of steel includes hardening, annealing, normalizing, tempering, and case hardening.

Hardening:
Hardening is done by subjecting a metal to a required temperature and then quickly cooled through a medium of quenching such as oil or water. Hardening is done in order to increase the hardness and strength of metal which is achieved by rapid cooling. The metal becomes brittle after it is rapidly cooled.

Annealing:
Steel is annealed when heated to a specific temperature and then allowing it to cool slowly back to room temperature. It helps in relieving internal stresses of metals, make them more ductile, and refine their grain structures. During the cooling process, the metal is covered under the arches created when heating or if heated with a furnace, it is expected to shut it off leaving the metal inside allowing the furnace and metal to slowly cool together.

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