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Oil Hardening- the process of hardening a ferrous-alloy by heating to or above transformation range and quenching in oil.

Ore- A mineral from which metal can be extracted to a sufficient degree it can be mined.

Overheating- occurs when a metal is heated to such a high temperature it's properties are impaired.  If the properties can not be restored by any process, the overheating is then referred to as burning.

Oxidation- The combination of a substance with oxygen.

Oxide- a compound of oxygen with another element, resulting from oxidation.

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