Ductile iron is through get spheroidal graphite spheroidization
and inoculation, effectively improve the mechanical properties
of cast iron, especially improve the plasticity and toughness,
and high intensity than carbon steel.
Ductile cast iron is in the 50 s of the 20th century developed a
kind of high strength cast iron material, its comprehensive
performance is close to steel, it is based on its superior
performance, has been successfully used in casting some stress
complex, requiring higher strength, toughness, wear resistance
Ductile cast iron has been developed rapidly for behind of gray
cast iron, cast iron material. They are widely used. The
so-called "iron and steel", mainly refers to nodular cast iron.
Ingredients: pig iron is the carbon content is more than 2% of
the iron carbon alloy, industrial iron carbon content is in
commonly 2.5%, 4%, and including C, SI, Mn, S, P and other
elements. Depending on the state of carbon in cast iron, and can
be divided into pig iron for steel making and foundry pig iron
and nodular cast iron etc.
Precipitation of spherical graphite cast iron. Spheroidal
graphite split function to metal substrate is greatly smaller
than flake graphite, make the strength of the cast iron matrix
organization intensity of 70 ~ 90%, the tensile strength of up
to 120 KGF/was, and it has good toughness. The chemical
composition of ductile cast iron in addition to the iron is
usually: carbon content of 3.6 ~ 3.8% and 2.0 ~ 3.0%, and
silicon content, phosphorus, sulfur, manganese content in the
total amount is less than 1.5% and the right amount of rare
earth, magnesium nodulizing agent, etc.
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