Malleable is a ductile form of cast iron that is produced by heat treating white iron.

Malleable iron has moderate strength and significantly greater ductility than gray iron.

White iron is reheated ( 1700oF)(925ºC) for several hours in the presence of materials containing oxygen, such as iron oxide.

At the elevated temperatures cementite (Fe3C) decomposes into ferrite and free carbon.

At cooling, the combined carbon further decomposes to small compact particles of graphite. Free carbon that released is referred to temper carbon, the process called malleableizing.

Moderate strength

High ductility

Machinability

Castability

Good toughness

Machine Construction

Transport Industry

paper, printing and agricultural industries, where the material is used to make oil, cooling

and lubrication pipes

used for cylinder blocks and heads as well as gearbox cases. The material is particularly effective for producing large scale parts in

commercial vehicles.

Heating, Cooling and Safety Systems

Gas Industry

•used in emergency systems, such as gas and sprinkler fire extinguishing mechanisms.

• also used in cooling, air conditioning and heating systems in both private and commercial properties.

used as the narrow threads in the material allow pipes to be precisely aligned and sealed,

reducing the cost of construction and the possibility of dangerous gas leakage.

Advantages: Excellent machinability Significant ductility Good shock resistance properties

Disadvantages: The major disadvantage is shrinkage. Malleable cast

iron decreases in volume during solidification, and as a result, requires attached reservoirs (feeders and risers) of liquid metal to offset the shrinkage and prevent the formation of internal or external shrinkage defects.