Conventional elements impact on the performance of cast iron

Carbon ( C) : in the cast iron exist in two forms, one is free carbon ( Graphite) , mainly exists in cast iron, the other is a compound carbon ( Iron carbide) , mainly exists in steelmaking pig iron, iron carbide hard and brittle, plasticity, low content of appropriate strength and hardness of the progress of cast iron, too, has cast iron is difficult to cut cut processing, that is why steelmaking pig iron cutting performance is poor. Graphite is soft, low intensity, it can increase the cast iron casting performance. Silicon ( Si) : can cause the separation of carbon contained in the cast iron as the graphite shape, can go to oxygen, can also reduce the air cavity castings, can you improve the activity of the condensation cast iron, reduce the shrinkage of casting, but too much containing silicon, will also make the cast iron hard brittle. Manganese ( Mn) : soluble in ferrite and cementite. In the blast furnace refining pig iron, manganese content properly, can progress of the cast iron casting performance and cutting performance, cutting in blast furnace manganese can constitute a manganese sulfide, sulfur and harmful impurities into the slag. Phosphorus ( P) : belong to the harmful elements, but phosphorus can increase the activity of the hot metal, this is due to the reduced sulfur melting of cast iron, so often of high phosphorus content in some products. But the existence of phosphorus and iron increase hard brittle, excellent iron phosphorus content should be less, sometimes in order to increase activity, phosphorus content can reach 1. 2%. Sulfur ( S） : in the cast iron is a harmful element, it makes the separation of iron and carbon, iron hard brittle, and synthesis of low melting point of iron sulfide and iron, pig iron to produce hot brittleness and reduce the activity of iron liquid, despite high sulfur is not suitable for casting of cast iron pieces. Most of sulfur content in cast iron rule shall not exceed 0. 06%