Correct Answer - Option 1 : White Cast Iron
Explanation:
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.
Spheroidal Cast Iron: It is also called ductile cast iron or high strength cast iron.
- This type of cast iron is obtained by adding small amounts of magnesium (0.1 to 0.8%) to the molten grey iron.
- The addition of magnesium causes the graphite to take the form of small nodules or spheroids instead of the normal angular flakes.
Grey Cast iron:
- The carbon content in Grey Cast Iron is 2.5 to 3.5%.
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It is grey because carbon is present in the form of free Graphite.
- High compressive strength, low tensile strength, and easily machinable
Malleable cast iron: It is a heat-treated iron-carbon alloy
- The graphite structure is formed into irregularly shaped spheroidal particles
- Malleable cast iron is produced from white cast iron by annealing.
- During annealing treatment graphite nucleates and grows from the Fe3C to form nodules.
