hardenability
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Hardenability is the depth to which a steel is hardened after putting it through a heat treatment process. It should not be confused with hardness, which is a measure of a sample's resistance to indentation or scratching. It is an important property for welding, since it is inversely proportional to weldability, that is, the ease of welding a material.
Excerpted from Wikipedia’s “hardenability” article, available under the CC BY-SA 4.0 licence.