C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
C21D 7/00 (2006.01) B02C 17/20 (2006.01) B02C 17/22 (2006.01) C21D 1/18 (2006.01) C21D 6/00 (2006.01)
Patent
CA 2251106
Comminuting media comprising a martensitic/austenitic steel which contains at least about 40 percent by volume retained austenite, a portion of which is work transformable to martensite. The steel contains sufficient alloy content such that the steel has a martensite start and finish temperature sufficiently low to allow partial transformation of austenite to martensite during quenching of the steel from the austenitic range, but leaving some retained transformable austenite. This steel is used as a comminuting media, the retained austenite transforming to martensite through working or abrasion of the comminuting media during use in a comminution process. The outermost volume of the comminuting media which forms the wear surface and which contains the retained austenite in an amount of at least 40 percent by volume comprises at least 25 percent of the total volume of the comminuting media.
La présente invention concerne un milieu de broyage fin comprenant un acier martinsitique/austénitique renfermant pour 40 % de son volume de l'austénite dont une partie est transformable en martensite par l'effet des contraintes. L'acier contient une proportion suffisante d'alliage pour présenter une température de début et de fin de martensite suffisamment basse pour permettre une transformation partielle de l'austénite en martensite pendant le refroidissement de l'acier à partir de la plage austénitique, tout en laissant un peu d'austénite transformable. Cet acier convient comme milieu de broyage fin, l'austénite retenue se transformant en martensite par l'effet des contraintes ou par abrasion du milieu de broyage fin pendant l'utilisation dans un processus de broyage fin. Le volume le plus extérieur du milieu de broyage fin, qui forme la surface d'usure et qui renferme l'austénite dans une proportion d'au moins 40 % du volume, comprend au moins 25 % du volume total du milieu de broyage fin.
Arnett Charles R.
Lorenzetti James J.
Moroz Peter J. Jr.
Gs Technologies Operating Company
Moly-Cop Group
Smart & Biggar
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