Question

Carbon steels containing ________ carbon are easier to hard-face.

(a) < 0.35%

(b) 3.2%

(c) 5.18%

(d) > 6.77%

This question was posed to me in my homework.

My doubt stems from Metal Spraying and Hard Facing, Age Hardening topic in section Wear of Metals, Mechanical Properties and Testing of Engineering Material & Metallurgy

Answer 1

The correct choice is (a) < 0.35%

Best explanation: Hard facings can be applied to most ferrous metals, but with a few exceptions. Carbon steels containing less than 0.35% carbon are relatively easy to hard-face. Welding becomes more difficult with increasing carbon content and hence must be preheated and postheated for hard-facing.