The GATE Grind

GATE 2022 MT – Question 14

Manufacturing Processes · Metal casting · 1 mark · Multiple choice

Magnesium treatment is carried out to produce ___________ cast iron.

  1. white
  2. gray
  3. spheroidal graphite
  4. malleable

Practise this question in The GATE Grind →

Show answer and explanation

Correct answer: (C) spheroidal graphite

Explanation

Magnesium modifies graphite growth from flakes to spheroidal nodules. The product is **spheroidal graphite cast iron, C**, also called ductile iron; malleable iron instead requires heat treatment of white iron.