Question

What is the maximum allowable temperature at which High-Speed Steels retain good cutting ability?

(a) 100^oC

(b) 200^oC

(c) 350^oC

(d) 540^oC

I got this question by my college director while I was bunking the class.

I want to ask this question from Stainless Steels & Other Steels topic in section Diffusion in Solids & Ferrous Materials of Engineering Material & Metallurgy

Answer 1

Correct choice is (d) 540^oC

The best I can explain: High-speed steels have the ability to remove and cut metal at a much higher rate than carbon steels. They have a good cutting ability even at a temperature as high as 540^oC. Above this temperature, they soften and lose their cutting edge.