1. White cast iron
  2. Nodular cast iron
  3. Malleable cast iron
  4. Alloy cast iron

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Answer: Option 4

When elements like nickel, chromium, copper and molybdenum are added to the molten cast iron, it produces Alloy cast iron. Alloy cast iron - cast iron containing alloying elements (usually nickel or chromium or copper or molybdenum) to increase the strength or facilitate heat treatment. Alloy cast iron - an alloy of iron containing so much carbon that it is brittle and so cannot be wrought but must be shaped by casting.

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