1. 400°C to 600°C
  2. 600°C to 900°C
  3. 900°C to 1400°C
  4. 1400°C to 1530°C
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1 Answers

Answer: Option 3

As the iron cools further to 1,394°C its crystal structure changes to a face centered cubic (FCC) crystalline structure. In this form it is called gamma iron (γ-Fe) or Austenite. γ-iron can dissolve considerably more carbon (as much as 2.04% by mass at 1,146°C). This γ form of carbon saturation is exhibited in stainless steel.

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