Topic: Material Science
Which one of the following steels contains least percentage of carbon?
- A. Mild steel
- B. Stainless steel 304L
- C. Stainless steel 316L
- D. IF steel
Answer: D. IF steel
Explanation: Interstitial Free (IF) Steels are ultra-low carbon steels. Carbon is small enough to fit into the interstices of the primarily iron matrix making it an 'interstitial element'. In IF steel, carbon and nitrogen levels are kept extremely low, leaving these gaps empty.