what is the main purpose of annealing
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To relieve stresses, which can lead to breakage at room temperature, it is necessary to cool glass in a controlled manner through a predetermined temperature gradient. ... This controlled process for cooling glass to relieve interior stresses is called "annealing."
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i think to improve machinability
ok thanks bro
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In general, the main purpose of annealing heat treatment is to soften the steel, regenerate overheated steel structures or just remove internal tensions. It basically consists of heating to austenitizing temperature (800ºC and 950ºC depending on the type of steel), followed by slow cooling.
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