why tool is heat treated
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Tempering tool steel makes the newly formed martensite less brittle. Without proper tempering, martensite will crack—or even shatter—very easily. Proper tempering is an essential step in the overall tool steel heat treating process. ... The key to effective tempering is patience.
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Heat treating can improve wear resistance by hardening the material. Metals (including steel, titanium, inconel, and some copper alloys) can be hardened either on the surface (case hardening) or all the way through (through hardening), to make the material stronger, tougher, more durable and more resistant to wear.
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