Knife Heat-Treatment
Plain-English, source-cited guides to hardening and tempering blade steel.
Guides
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Tempering temperature and color chart
What the temper colors mean, why an oven beats reading oxide colors, and typical knife temper temps.
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Quench and temper: hitting a target HRC
The austenitize–quench–temper sequence and the three levers that set final hardness.
Temper: Knife Heat-Treatment Calculator
Pick your steel and target hardness and Temper returns the full schedule — austenitizing, quench, temper, cryo, expected HRC — from published metallurgy. Free to download.