Stainless steel having excellent antibacterial property and...

C - Chemistry – Metallurgy – 22 – C

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C22C 38/18 (2006.01) C22C 38/00 (2006.01) C22C 38/22 (2006.01) C22C 38/42 (2006.01) C22C 38/44 (2006.01)

Patent

CA 2288864

A stainless steel product being excellent in processability and corrosion resistance and having enhanced antibacterial action. Specifically, into a stainless steel containing 10 wt.% or more of Cr, 0.0001 to 1 wt.% of Ag and optionally, in addition, at least one selected from among 0.0002 to 0.02 wt.% of Sn, 0.0002 to 0.02 wt.% of Zn and 0.0002 to 0.01 wt.% of Pt are incorporated. And further, at least one of silver particles, silver oxide and silver sulfide is dispersed in the steel in an proportion of area of 0.001 % or more. For performing homogeneous dispersion of silver particles, silver oxide and silver sulfide, it is preferred that a pouring rate in a continuous casting is 0.8 to 1.6 m/min.

L'invention concerne un produit en acier inoxydable qui possède une excellente aptitude au traitement et une bonne résistance à la corrosion et qui manifeste une meilleure action antibactérienne. Plus concrètement, on incorpore en option à un acier inoxydable contenant 10 % en poids ou plus de Cr, 0,0001 à 1 % en poids d'Ag, au moins l'un des éléments suivants: 0,0002 à 0,02 % en poids de Sn, 0,0002 à 0,02 % en poids de Zn et 0,0002 à 0,01 % en poids de Pt. En outre, on disperse dans l'acier au moins des particules d'argent, de l'oxyde d'argent et du sulfure d'argent, dans des proportions de l'ordre de 0,001 % ou plus. Afin d'effectuer la dispersion homogène des particules d'argent, de l'oxyde d'argent et du sulfure d'argent lors de la coulée continue, on choisit de préférence une vitesse de coulage comprise entre 0,8 et 1,6 m/min.

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