Multiple choice

Identify the incorrect statement/s.

A. Mild steel contains 0.30% to 0.60% of carbon. B. Promoted iron is used as the catalyst in the Haber-Bosch process of NH3 production. C. In the quenching process of mild steel, water or oil is used.

  1. Only A

  2. Only B

  3. Only C

  4. A and B

  5. B and C
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

A. Mild steel contains 0.15% to 0.30% of carbon. Medium steel has 0.30% to 0.60% of carbon. B. Promoted iron is used as the catalyst in the Haber-Bosch process for the making of NH3. C. Mild steel is malleable and can be bent or machined. This is hardened (tempered) by heating to red heat and quenched by plunging into water or oil.

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