Question

18. Which metal cannot be
forged
A Steel
B: Cast iron
C: Mild steel
D. Alloy​

Answer 1

Answer:

B: Cast Iron

Explanation:

It is the right answer...

Answer 2

Cast iron cannot be forged (option B).

• When compressive forces are used to shape metal, the process is called the forging of metals. This process is executed to strengthen the metal.
• Steel can be forged to make it stronger. In the process of forging the steel metallurgical recrystallisation happens to make the steel stronger. So option A is incorrect.
• The less the amount of carbon in a metal, the less the metal is brittle. 4.2 wt % carbon is present in cast iron and the cast iron is brittle. This is why the forging of casting iron cannot be done. Option B is correct.
• 0.05% to 0.26% carbon is present in Mild steel. So Mild steel is not much brittle. So mild steel can be forged. So option C is incorrect.
• Alloy does not contain much carbon. So alloy can be forged. So option D is incorrect.

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