CENTRIFUGAL CASTING OF TOUGH DUCTILE CAST IRON TUBE

摘要

PURPOSE: To provide the centrifugal casting method capable of obtaining a ductile cast iron tube having high strength/elongation and excellent toughness even though a tube thickness is thin. ;CONSTITUTION: A ductile cast iron molten metal is produced by adding graphite spherodizer in the source molten metal melted by melting furnace, subjecting to inoculation on the molten metal and casting into the mold for centrifugal casting, a ductile cast iron tube is centrifugally cast. At this time, the treatment for spherodizing graphite is executed with using Mg alloy containing a rare metal element, a ductile cast iron molten metal, which contains, by weight, 2.1-2.5% Si, 0.04-0.06% Mg in the case of using the source molten metal melted by cupola (or 2.6-2.8% Si, 0.03-0.06% Mg in the case of using the source molten metal melted by electric furnace), is produced, the molten metal is subjected to inoculation to the molten metal and is cast into the mold for centrifugal casting having a powder layer of inoculant on its inside surface.;COPYRIGHT: (C)1994,JPO&Japio