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Take a piece of springy steel wire or hairpins. Straighten one end of the steel and hold one end with tongs Heat the centre of the other half in the flame until it is red hot. Shift it slowly higher in the flame and hold it for a while. • Finally remove it and let it cool on a tile. When it is cool, pick it up and try to bend it in your fingers. Try to bend both halves with your fingers. Review Questions 1. How do the 2 halves compare (bendability)? 2. How has the springy steel change its property after being heated and slowly cooled? 3. What process have you carried out on the steel wire? 4. What does the process do to the springiness of the steel?

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Annealing alters the physical and chemical properties of the metal to increase ductility and reduce hardness. This facilitates shaping, stamping or forming PROCESSES, and allows the metal to be cut more easily. Annealing also enhances electrical conductivity.Tempering, in metallurgy, process of improving the characteristics of a metal, especially steel, by heating it to a high temperature, though below the MELTING point, then COOLING it, usually in air. The process has the effect of toughening by LESSENING brittleness and reducing internal stresses.In principle, when steel cools quickly, there is less time for carbon atoms to move through the lattices and form larger carbidesThe temperatures metals are heated to, and the rate of cooling after heat TREATMENT can significantly change metal's properties. ... It softens metal, making it more workable and providing for greater ductility. In this process, the metal is heated above its upper critical temperature to change its microstructure.


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