All components in the hardened condition are too hard and too brittle for their designed purpose and must be tempered by reheating the component at a lower temperature to reduce the as hardened condition to the desired hardness or strength value.
The temperature, usually between 150°c and 550°c, and time given to the component are again critical to allow the temperature to equalize fully followed by slow cooling to room temperature.
Some materials used dictate a double and sometimes triple temper whereby we have to repeat the tempering process to obtain the required structure and hardness.
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