File:Tempering_colors_in_steel.jpg · Wikimedia Commons · See Wikimedia Commons
tempering
process of heat treating used to increase the toughness of iron-based alloys
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Differentially tempered steel. The various colors produced indicate the temperature the steel was heated to. Light straw indicates 204 °C (399 °F) and light blue indicates 337 °C (639 °F).
Tempering is a process of heat treating, which is used to increase the toughness of iron-based alloys.