Water-cooled rolls for cooling steel sheets

Details Water-cooled rolls for cooling steel sheets Water-cooled rolls for cooling steel sheets

C - Chemistry, Metallurgy

21

D

C21D 9/573 (2006.01)

Patent

CA 2047519

A water-cooled roll for cooling steel sheets is spray-coated on the surface that comes in contact with the steel sheets with a cermet composed of a metal oxide having a higher hardness and lower thermal conductivity than metals and a metal matrix of Ni- or Co-base heat-resisting alloy. The metal oxide is chosen from among Al2O3, Cr2O3, SiO2, and ZrO2, and the metal matrix consists of an MCrAlY (M = Co or Ni). Preferably, the metal oxide is alumina and the metal matrix, CoCrAlYTa.

Un rouleau refroidi à l'eau pour le refroidissement des feuilles d'acier est revêtu par pulvérisation sur sa surface en contact avec les feuilles d'acier d'un cermet composé d'un oxyde de métal ayant une dureté supérieure et une conductivité thermique moindre que les métaux et une matrice métallique d'un alliage thermorésistant à base de Ni ou de Co. L'oxyde de métal est choisi parmi Al2O3, Cr2O3, SiO2 et ZrO2 et la matrice métallique consiste en un alliage de type MCrAlY (M= Co ou Ni). Préférablement, l'oxyde de métal est l'alumine et la matrice métallique CoCrAlYTa.

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