C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
C21D 1/06 (2006.01) A47G 21/00 (2006.01) C21D 9/18 (2006.01) C23C 8/26 (2006.01)
Patent
CA 2676987
The invention relates to cutlery and/or serving cutlery made of a steel material which is formed with a ferritic core with a substantially martensitic case. The case surface hardness of the cutlery and/or serving cutlery of the invention, determined according to the Vickers hardness test according to Vickers HV 3, is thereby 30% to 300% greater than the lowest degree of hardness of the core, likewise measured according to Vickers HV 3. The case also has a higher elastic modulus than the core. The surface treatment occurs preferably by means of nitridization and heat treatment.
L'invention concerne des couverts de table et/ou de service en acier formé d'un coeur ferritique et d'une couche en bordure essentiellement martensitique. Le couvert de table et/ou de service selon l'invention est caractérisé en ce que la dureté superficielle de la couche en bordure, déterminée suivant l'essai de dureté Vickers HV3, est de 30 à 300% plus élevée que la plus petite dureté du coeur, mesurée également suivant Vickers HV3. La couche en bordure présente, de même, un module E plus élevé que le coeur. Le traitement de surface s'effectue de préférence par nitruration et traitement thermique.
Boerner Cornelius
Buehlmaier Guenter
Friz Wolfgang
Kiefer Alexander
Neumayer Martin
Mcfadden Fincham
Wmf Aktiengesellschaft
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