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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