malleable iron

nodular iron

spheroidal iron

grey iron

which are destroyed by burning

which after their destruction are recycled to produce fresh steel

which are deoxidised in the ladle with silicon and aluminium

in which carbon is completely burnt

amount of carbon it contains

the shape and distribution of the car-bides in iron

method of fabrication

contents of alloying elements

0.03%

0.06%

0.10%

0.25%

0.03%

0.26%

0.80%

1.7%.