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Tempering: This process involves heating a metal to a temperature below its "lower critical temperature" and then air-cooling it. Tempering is often used on iron-based alloys like steel to increase their toughness, develop their strength and toughness, or relieve brittleness. Tempering can also improve the metal's microstructure, which increases its strength, and relieve internal stresses.
Heat treatment: Heat treatment is the process of heating metal without letting it reach its melting point, and then cooling it in a controlled way to select desired mechanical properties.
Principally there is no requirement of APCD in above mentioned process. The industry has proposed to install shot blasting machine with bag house as APCD.
Submitted with previous recommendations, please
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