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Q. |
Ultra high-speed steels are made of which of the following elements? |
A. | tungsten and molybdenum |
B. | chromium and molybdenum |
C. | vanadium and cobalt |
D. | molybdenum and cobalt |
Answer» C. vanadium and cobalt | |
Explanation: ultra high-speed steels have greater tool lives and greater cutting efficiency. this is due to the addition of vanadium (up to 4%) and cobalt (5% to 12%) along with carbon, chromium, and tungsten. |
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