White Iron is unalloyed cast iron with low carbon and silicon content such that the structure is hard brittle iron carbide with no free graphite. Applications of Ductile cast iron. Common applications of cast iron. The various properties of different types of cast iron results in each type being suited for specific applications. WHITE CAST IRON It is the cast iron in which all the cast iron in the combined form as cementite. Its fracture surface is white, therefore known as white cast iron. The hypereutectic HCCI with large volume fractions of hard carbides is preferred to apply in wear applications.

Malleable Cast Iron. Material properties are intensive properties, that means they are independent of the amount of mass and may vary from place to place within the system at any moment.

The white cast iron is heated treated for up to two days, after which it’s cooled. These irons are limited in application because of the lack of impact resistance and the difficulty in maintaining the structure in thicker sections. gray iron) is a type of iron found in castings known for its grey color and appearance caused by graphite fractures in the material. There are many advantages of using white cast iron. The mechanical properties of ductile irons are more that of basic cast steels and ductile iron can often be used as a cheaper alternative, whilst still offering acceptable service performance.
While cast iron withstands compression force very well, this brittle metal can crack under excessive tension without warning.
satyendra; August 21, 2014; 0 Comments ; cast iron, ductile iron, Ferrite, malleable iron, pearlite, Malleable Cast Iron Malleable cast iron is essentially white cast iron which has been modified by heat treatment. Graphite also acts as a lubricant, improving wear resistance. All white cast iron are hypoeutectic. Solidification now begins by the formation of austenite crystals containing about 1 percent carbon. Gray iron applications. It is formed when white cast iron is heated to around 920 deg C and then left to cool very slowly. Properties of Malleable Cast Iron – ASTM A220. the upper cylinder walls in engine blocks). Iron carbide can decompose into iron and carbon under certain conditions. White cast iron displays white color cracks when it fractures due to carbide impurities.

In comparison, steel has a lower carbon content of up to 2 wt.% and a lower silicon content. It is abrasive resistant as well as cost-effective making them useful in various applications like lifter bars and shell liners in grinding mills, wear surfaces of pumps, balls and rings of coal pulverisers, etc. This reaction is favored by high temperatures, slow cooling rates and high carbon and silicon contents. Ductile iron has greater strength and ductility then gray iron. There are four basic types of cast iron: ductile, malleable, white and … Properties And Applications for Ductile Iron Castings Cast Iron: Properties, Processing and Applications. The carbon present in the white cast iron precipitates and forms large particles that increase the hardness of the cast iron. Low Tensile Strength. One of the key characteristics of gray iron is its ability to resist wear even when lubrication supply is limited (e.g.

White cast iron displays white color cracks when it fractures due to carbide impurities. With carbon content of 2.1 to 4.5 % and silicon at about 2.2% and small amount of Sulphur, Manganese and Phosphorous. White cast irons are usually made by limiting the silicon content to a maximum of 1.3 percent, so that no graphite is present and all of the carbon exists as cementite (Fe 3 C).

The carbon content within the cast iron precipitates large molecules that increase its hardness and durability in applications. It is a strong structural material and also a good conductor of heat, making it a common material for cookware. Cast iron is iron mixed with small amounts of silicon and carbon, and cast -- rather than formed -- in place. In the figure the alloy at “x” exists as a uniform liquid solution of carbon dissolved in liquid iron.


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