CENTRIFUGAL CASTING METHOD OF WEAR RESISTANCE CASTING

摘要

PURPOSE:To improve the wear resistance of a casting contg. tungsten at a low rate by casting a prescribed molten ferrous alloy contg. tungsten into a mold for centrifugal casting and concentrating the crystallized tungsten carbide to the outside layer. CONSTITUTION:A molten ferrous alloy contg 1.5-5% C, <=3.5% Si and 25-80% W is poured into a mold for centrifugal casting. The tungsten carbide crystallized into the molten metal is then transferred into an outside layer region by a difference in specific gravity. The casting body having the concentrical two layer structure consisting of an outside layer A composed of the matrix (m) and crystallized tungsten carbide C and an inside layer B contg. the crystallized tungsten carbide C at the lower rate is obtd. Even if the tungsten content in the molten metal is low, the tungsten carbide is concentrated to the outside layer of the casting and the wear resistance thereof is improved.