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Generally used to improve the properties of the metal. For example to make it tougher or harder. Metals that have been cold worked will have areas of built up stress, which will waken the metal. Heat treatment can be used to remove the weak areas. Which heat treament is used depends on the desired properties of the final metal. Some examples are : Annealing Normalizing Quench Hardening Case hardening

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Does heat treatment increase the carbon content in carbon steel?

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