knife heat treating temperatures

4. While blades are cooling allow the furnace to cool down to 950°F. It increases initial hardness between 1.5 to 2 points and even though you may temper back to softer levels, the steel has been more completely transformed to a tough and desirable state. Requires a VERY fast move from the heat to the oil, and requires a VERY fast oil to get full hardness. Dissolving salt in boiling water until it no longer dissolves makes a brine solution. At this time you will notice that a black substance will be coming off, this is the carbon that was removed during the etch. I have a left a piece of steel overnight untempered and found it cracked the next day from the stress hardening puts into the steel.

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