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Use "casehardening" in a sentence
"a steel can be made, even by an ordinary traveller, out of common iron, by means of "casehardening" (which see)."
"Which steels can be worked by means of casehardening?"
"Steels of a carbon content below 0.35 per cent can be hardened at their surfaces when carbon is added to the steel from outside by means of a special process (casehardening)."