The composition of cast iron is analysed and sort is classified

Cast iron is to contain carbon to measure 2.11%-6.67% to contain a lot ofthe iron carbon alloy with the more impurity that be not iron. The foreign matter element of cast iron basically is silicon, sulfur, manganese, phosphor wait. Cast iron is qualitative hard and fragile, lack endurance, be out of shape without plasticity almost ability, because this cannot be passed,cast, the method such as rolling, drawing machines figuration. But contain the cast iron with tall silicon (grey iron) cast reach cutting performance is excellent. Cast iron is blast furnace product, by its utility can be divided mix for steel-making cast iron cast cast iron two kinds big. Customarily calls steel-making cast iron cast iron, cast cast iron abbreviation to be cast-iron. Cast cast iron to be changed through forge, decay, ball is changed wait for a method to be able to alter its interior structure, improve and advance its machinery function, accordingly, cast cast iron to be able to be divided again for Bai Kouzhu iron, grey mouth cast-iron, malleable iron, nodular cast iron is mixed special type is cast-iron wait for sort.

Cast iron also can be divided for general cast iron and alloy cast iron, former include steel-making cast iron and cast cast iron, , latter basically is ferromanganese and ferrosilicon. Alloy cast iron serves as the auxiliary material of steel-making, be like additive of deoxidizer, alloying element. General cast iron occupies blast furnace to train the 98% above of the product, and steel-making iron occupies the Chinese 80% above of current and general cast iron again, follow the advancement of industrialized level, this portion still will be added gradually.

Tell from the angle of broad sense, iron returns cent to be chemistry pure iron (contain C to be almost 0) , industrial pure iron (contain C to be less than 0.05% ) , and sponge iron, bead iron. But they all are not product of iron of blast furnace smelt metal, and utility also each different. C should be contained to be steel when 0.03%-1.2% dimensions in iron, the iron lack that contains C1.2%-2.5% is practical, do not undertake industry is produced commonly.

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