Which of the following has the least value of ultimate tensile strength (UTS) ?
Correct answer: B. Cast iron
- A. Medium carbon steel
- B. Cast iron
- C. High carbon steel
- D. Wrought iron
Explanation
Gray cast iron has relatively low tensile strength because its graphite flakes act as internal stress concentrators. Medium- and high-carbon steels, as well as wrought iron, normally have higher tensile strength.
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