Highest cutting speed is achieved by the _______________ tool material ?
Correct answer: B. Carbide
- A. High speed steel
- B. Carbide
- C. Cast alloy
- D. Plain carbon steel
Explanation
Carbide tools retain hardness at much higher temperatures than high-speed steel, allowing greater cutting speeds. Plain carbon steel and cast-alloy tools generally lose hardness sooner or have lower overall cutting performance.
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