Composition of nodular cast iron

Cast iron is an iron carbon alloy with carbon content greater than 2.11%. It is obtained by high-temperature melting and casting of industrial pig iron, scrap steel and other iron and its alloy materials. In addition to Fe, the carbon contained in other cast iron is precipitated in the form of graphite. If the precipitated graphite is in strip form, the cast iron is called gray cast iron or gray cast iron, the cast iron in worm form is called vermicular cast iron, and the cast iron in flocculent form is called malleable cast iron or code iron The cast iron when it is spherical is called nodular cast iron.

Except for iron, the chemical composition of nodular cast iron is usually: carbon content of 3.0 ~ 4.0%, silicon content of 1.8 ~ 3.2%, total amount of manganese, phosphorus and sulfur of no more than 3.0%, and an appropriate amount of nodular elements such as rare earth and magnesium.

The composition of spectral standard samples of nodular cast iron on the market is as follows: