Question

What is the amount of carbon used in HPF steel?

(a) Less than 0.37%

(b) Less than 0.27%

(c) Less than 0.47%

(d) Less than 0.57%

I have been asked this question by my school teacher while I was bunking the class.

I'm obligated to ask this question of Inverse Rate Curves for Steel topic in chapter Heat treatment of Metals and Alloys of Casting-Forming-Welding II

Answer 1

Right answer is (b) Less than 0.27%

For explanation I would say: The carbon content which is used in HPF steel is very less in percentage composition. The amount of carbon used in terms of percentage weight is less than 0.27%.