Ductile iron casting, ductile iron valve body, valve housing, pump housing

Ductile iron, also known as ductile cast iron, nodular cast iron, spheroidal graphite iron, spheroidal graphite cast iron and SG iron, is a type of graphite-rich cast iron discovered in 1943 by Keith Millis. While most varieties of cast iron are weak in tension and brittle, ductile iron has much more impact and fatigue resistance, due to its nodular graphite inclusions.

A typical chemical analysis of this material:

• Carbon 3.2 to 3.60%

• Silicon 2.2 to 2.8%

• Manganese 0.1 to 0.2%

• Magnesium 0.03 to 0.04%

• Phosphorus 0.005 to 0.04%

• Sulfur 0.005 to 0.02%

• Copper <0.40%

• Iron balance

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