Ductile-iron pipe | Article about ductile-iron pipe by The Free Dictionary
A pipe that is fabricated of a cast-iron alloy in which graphite replaces the carbon that is present in cast-iron; provides the same advantages as cast-iron pipe along with the added advantage of a higher external load-bearing capacity; not as brittle as cast-iron pipe (thus permitting rougher handling) but higher in cost.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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Written for designers, managers and operators of water distribution systems, this manual contains all the technical specifications and applications information regarding ductile-iron pipes
A second reason ductile iron tends not to hold up as well under comparable biocorrosion attack, King says, is that because of their superior strength, ductile-iron pipes
tend to be made thinner.