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This Document Has Been Superseded
A newer publication replaces it: BSI BS EN 1562
Specification for malleable cast iron
WITHDRAWN, 9/15/1997
Whiteheart malleable cast iron: This type is characterized by a predominantly white fracture surface. It requires normalizing heat treatment to convert the white brittle structure into a malleable form. The casting must have a dense, hard structure with minimal porosity. It is typically used where high strength and moderate ductility are required.
Blackheart malleable cast iron: This type is characterized by a black fracture surface due to the presence of tempered carbon. It is produced by annealing white cast iron at high temperatures to develop a tough, ductile matrix. The casting must be free from cracks and have good machinability. It is suitable for applications needing good ductility and shock resistance.
Pearlitic malleable cast iron: This type contains a pearlitic matrix in the casting, providing higher strength and wear resistance than blackheart types. The production involves controlled cooling and heat treatment to retain the pearlitic structure. The casting should exhibit fine pearlite with evenly distributed temper carbon nodules. It is used where strength and wear resistance are primary considerations.
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