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White Cast iron: It is white because carbon is in the form of carbide known as cementite which is the hardest constituent of Iron.
The carbon content in White Cast Iron is 1.75 to 2.3%.
It has high tensile strength, low compressive strength, and high brittleness.
It is used in abrasion-resistant parts where it's brittleness is of minimum concern such as shell liners, slurry pumps, ball mills, lifter bars, extrusion nozzles, cement mixers, pipe fittings, flanges, etc.