Refining element for a refining disc

B - Operations – Transporting – 02 – C

Patent

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B02C 7/12 (2006.01) C22C 37/06 (2006.01) C22C 38/22 (2006.01) C22C 38/24 (2006.01) C22C 38/36 (2006.01) C22C 38/44 (2006.01) C22C 38/46 (2006.01) C22C 38/56 (2006.01) D21B 1/14 (2006.01) D21D 1/30 (2006.01)

Patent

CA 2402032

Refining elements for refining discs for disc refiners for the manufacture of mechanical pulp, for example, board pulp, are subjected to hard abrasive wear in acid environment and at high temperature. In order to improve the wear resistance alloys with precipitated carbides are used. A service life improved in comparison with known alloys is obtained with a refining disc with the following analysis in % by weight: 2.96 C, 0.77 Si, 0.82 Mn, 24.2 Cr, 5.16 V, 0.04 Ni, 0.03 Mo, and the remainder Fe and impurities. After casting, the refining segments are hardened and annealed and assume a hardness of 57-63 HRC.

Les éléments de raffinage des disques de raffinage de raffineurs à disques destinés à la production de pâte mécanique, par exemple, de pâte de carton, sont soumis à une forte usure par abrasion dans un environnement acide et à une température élevée. Pour améliorer leur résistance à l'usure, on utilise des alliages aux carbures précipités. Pour augmenter la durée de vie utile d'un disque de raffinage par rapport aux alliages connus, le disque selon l'invention a la composition suivante en % par poids: 2.96 C, 0.77 Si, 0.82 Mn, 24.2 Cr, 5.16 V, 0.04 Ni, 0.03 Mo, le reste étant constitué de fer et d'impuretés. Après coulage, les segments de raffinage sont durcis et recuits, ce qui permet d'obtenir une dureté de 57 à 63 HRC.

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