Q.

Mushet steel belongs to which group of tool steels?

A. oil-hardening steels
B. air-hardening steels
C. high-speed steels
D. hot-working steels
Answer» B. air-hardening steels
Explanation: mushet steel was the first air- hardening tool steel. it belongs to the cold- working family of tool steels. it was developed by robert mushet.
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