Presence of cobalt in steel improves its____________________?
Correct answer: C. Cutting ability
- A. Tensile strength
- B. Corrosion resistance
- C. Cutting ability
- D. None of these
Explanation
Cobalt increases the hot hardness and red-hardness of steel, allowing cutting tools to retain their hardness at elevated temperatures. This improves cutting ability rather than primarily serving as a corrosion-resistance addition.
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