What is Annealing?
Sub-critical annealing is a treatment used to soften steel, improve its ductility, reduce brittleness and relieve stresses. The parts are heated to below the A1 (critical) temperature, then slow-cooled to room temperature. This process is frequently used on parts which have been flame/plasma/laser cut, as it greatly improves the machinability of the areas affected by the cutting process.
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