Types Of Cast Iron And Their Properties Pdf

types of cast iron and their properties pdf

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Cast iron is a ferrous alloy that is made by re-melting pig iron in a capola furnace until it liquefies. The molten iron is poured into molds or casts to produce casting iron products of the required dimensions.

Weldability of materials - cast irons

It has got its name due to its excellent casting qualities. It is hard and brittle. There is a basic difference between cast iron and steel. In the above table you can find the composition of different types of cast irons. Carbon is present here in the form of Iron carbide Fe 3 C. Carbon here is mainly in the form of graphite.

As cast irons are relatively inexpensive, very easily cast into complex shapes and readily machined, they are an important engineering and structural group of materials. Unfortunately not all grades are weldable and special precautions are normally required even with the so-called weldable grades. Cast irons can be conveniently grouped according to their structure which influences their mechanical properties and weldability; the main groups of general engineering cast irons are shown in Fig. Grey cast irons contain 2. Their structure consists of branched and interconnected graphite flakes in a matrix which is pearlite, ferrite or a mixture of the two Fig. The graphite flakes form planes of weakness and so strength and toughness are inferior to those of structural steels. The mechanical properties of grey irons can be greatly improved if the graphite shape is modified to eliminate planes of weakness.

The alloy constituents affect its colour when fractured: white cast iron has carbide impurities which allow cracks to pass straight through, grey cast iron has graphite flakes which deflect a passing crack and initiate countless new cracks as the material breaks, and ductile cast iron has spherical graphite "nodules" which stop the crack from further progressing. Carbon C ranging from 1. Iron alloys with lower carbon content are known as steel. Cast iron tends to be brittle , except for malleable cast irons. With its relatively low melting point, good fluidity, castability , excellent machinability , resistance to deformation and wear resistance , cast irons have become an engineering material with a wide range of applications and are used in pipes , machines and automotive industry parts, such as cylinder heads , cylinder blocks and gearbox cases.

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In this article, you learn what is cast iron and 7 different types of cast iron, properties, application, advantages and more. The cast iron is obtained by re-melting pig iron and with coke and limestone in a furnace known as a cupola. It is an alloy of iron and carbon. The carbon contents in cast iron differ from 1. Also, it contains a very small amount of silicon, sulphur, manganese and phosphorus.


White Cast Iron (combined carbon Fe. Malleable Cast Iron (free carbon as irregular. Chilled Cast Iron (white cast iron at the surface. Grey Cast Iron (Flake Graphite) Spheroidal Graphite (SG) / Ductile Cast Iron / Alloy Cast Iron.


Cast Iron | Types, Advantages, Disadvantages, Uses, Properties

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TYPES OF CAST IRONS

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desired mechanical properties. Classification. Historically, the first classification of cast iron was based on its fracture. Two types of iron were initially recognized.


Different Types Of Cast Iron

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Weldability of materials - cast irons

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