NF A95-321-3:1988 Powder metallurgy. Sintered metal materials, excluding hardmetals. Determination of hardness. Part 3 : sintered products hardened on a surface by other treatments than in NF A 95-321-2.
2008NF A95-321:2008 Sintered metal materials, excluding hardmetals - Determination of apparent hardness and microhardness.
1988NF A95-321-3:1988 Powder metallurgy. Sintered metal materials, excluding hardmetals. Determination of hardness. Part 3 : sintered products hardened on a surface by other treatments than in NF A 95-321-2.