Continuous Cast Ductile Iron as an Alternative to Wrought Steel
Bob O’Rourke, Dura-Bar Continuous cast ductile iron is produced by passing
molten material through a water-cooled graphite die. The castings are produced in standard shapes, such as in rounds, rectangles or other simple profiles. The bars are available in standard sizes, grades and lengths, similar to carbon steel bar stock. While the material
Continuous cast bar stock is produced only in standard shapes, but it can be machined into a variety of component forms.
is not produced to near net shape and requires considerable machin- ing, it is more easily machined than steel. Advantages of continuous cast ductile bar are excellent surface fin- ishes and the elimination of gas and slag defects, shrink and hard spots. The general guidelines for finding conversions to continuous cast bar are to look for parts in 1117, 1212, 12L14, 1215, 1144 or 1045 steel bar or forgings, high production parts being CNC machined, parts requir- ing multiple machining operations (drilling, milling, turning, etc.), and carburized parts made from low car- bon steel. The improved machinabil- ity of continuous cast ductile iron is particularly evident when converting from low to medium carbon steels. When carburizing is involved, lower heat treat costs can be realized while maintaining similar strengths and other properties.
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48 Metal Casting Design anD PurChasing May/June 2010
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