In a drilling process, the metal is removed by both shearing & extrusion. General purpose drills are made of_________________?
Correct answer: C. High speed steel
- A. Stainless steel
- B. Mild steel
- C. High speed steel
- D. High carbon steel
Explanation
High-speed steel retains hardness at the elevated temperatures produced during drilling, while ordinary mild and carbon steels soften more readily. This combination of hot hardness and wear resistance makes it suitable for general-purpose drill bits.
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