1. Malleable iron
  2. Nodular iron
  3. Spheroidal iron
  4. Grey iron
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1 Answers

Answer: Option 1

Malleable iron is obtained by the heat treatment of white iron so the hard iron carbide structure of ledeburite is converted to a matrix of ferrite or pearlite and graphite is precipitated within the iron. This form of graphite is sometimes referred to as tempered carbon.

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