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Ductile iron, also known as ductile cast iron, nodular cast iron, spheroidal graphite iron, spheroidal graphite cast iron [1] and SG iron, is a type of graphite-rich cast iron discovered in 1943 by Keith Millis. [2]
Ductile iron, also known as nodular iron or spheroidal graphite iron, is very similar to gray iron in composition, but during solidification the graphite nucleates as spherical particles (nodules) in ductile iron, rather than as flakes.
Ductile iron, also known as nodular iron or spheroidal graphite iron, is very similar to gray iron in composition, but during solidification the graphite nucleates as spherical particles (nodules) in ductile iron, rather than as flakes.
Ductile iron, an alloy of iron and carbon, is a special type of cast iron having properties comparable to steel. Due to its unique microstructure, ductile iron exhibits high strength, durability, flexibility, and elasticity.
Ductile cast iron stands out for its exceptional strength, high ductility, and excellent machinability. Its unique microstructure, comprising graphite nodules within a ferritic or pearlitic matrix, gives it an edge over other materials.
Ductile iron, also known as nodular cast iron or nodular iron, is a cast iron alloy with distinctive properties, including impact and fatigue resistance, elongation, and wear resistance. These properties arise from the spheroidal graphite structures within the metal’s microstructure.
While cast iron is more machinable and affordable, ductile iron is more weldable and offers superior mechanical properties. Understanding the differences between these two iron alloys is crucial in selecting the right material for specific applications.
Ductile cast iron is a relatively new metallurgical innovation, having been introduced in the 1940s. In addition to iron, it is about 3.2 to 3.6 percent carbon and 2.2 to 2.8 percent silicon, with the remainder filled out by elements such as manganese, magnesium, phosphorus, sulfur, and/or copper.
Ductile iron is stronger and more shock resistant than gray iron. Ductile iron has mechanical characteristics approaching steel, while it retains high fluidity when molten and lowers its melting point.
Ductile iron, also known as nodular iron or spheroidal graphite iron, is second to gray iron in the amount of casting produced. This article discusses the common grades of ductile iron that differ primarily by the matrix structure that contains the spherical graphite.