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Special interest is presented by the nitrided steels, because of the fact that they can be made to have a higher order of hardness (1000 to 1200 Brinell) than high-speed and case-carburized steels (700 to 800 Brinell) and, therefore, present possibilities of supplying a material which will retain an unusual order of hardness, even at elevated temperatures.
Harder, Oscar E.
Assistant Director, Battelle Memorial Institute, Columbus, Ohio.