NF A95-321-2

Powder metallurgy. Sintered metal materials, excluding hardmetals. Determination of apparent hardness. Part 2 : case-hardened ferrous materials, surface enriched by carbon or carbon and nitrogen.

La présente norme définit la dureté des matériaux frittés au moyen des méthodes Brinell, Rockwell et Vickers. Cette dureté est souvent appelée dureté apparente. Ces méthodes s'appliquent ici aux produits frittés hétérogènes ayant subi un traitement de surfacetel que la dureté varie sur une profondeur inférieure à 5 mm en dessous de la surface, par exemple : trempe superficielle, cémentation, traitement de diffusion, carbonitruration, su sulfocarbonitruration.

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