Question

What is the amount of carbon present in low carbon steel?

(a) Less than 0.5%

(b) Less than 0.7%

(c) Less than 0.4%

(d) Less than 0.2%

The question was asked at a job interview.

My doubt is from Classification of Foundry Metals and Alloys in portion Foundry Introduction & Materials of Casting-Forming-Welding II

Answer 1

The correct choice is (d) Less than 0.2%

Best explanation: Low carbon steel has the lowest amount of carbon mixed with iron in the alloy. The amount of carbon present in low carbon steel is less than 0.2% and that of medium carbon steel has carbon composition of about 0.2% to 0.5%.