Machinability martensitic stainless steel

C - Chemistry – Metallurgy – 22 – C

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C22C 38/60 (2006.01) C21D 1/18 (2006.01) C22C 38/52 (2006.01)

Patent

CA 2125732

L'invention a pour objet un acier inoxydable martensitique à usinabilité améliorée, caractérisé en ce que sa composition pondérale est la suivante : - carbone inférieur à 1,2% - silicium inférieur ou égal à 2% - manganèse inférieur ou égal à 2% - chrome : 10,5<Cr<19% - soufre inférieur ou égal à 0,55% - calcium supérieur à 32.10-4% - Oxygène supérieur à 70.10-4%, - le rapport de la teneur en calcium et en oxygène Ca/O étant 0,2<Ca/O<0,6,ledit acier étant soumis à au moins un traitement thermique de trempe pour lui conférer une structure martensitique.

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