Question

Pig iron from blast furnace contains ________ carbon.

(a) 1.5%–2.0%

(b) 2.5%–6.0%

(c) 6.5%–8.0%

(d) 3.5%–5.0%

The question was posed to me in an interview for internship.

Enquiry is from Manufacture of Tinplate in portion Metal Packaging Materials of Food Packaging Technology

Answer 1

The correct answer is (d) 3.5%–5.0%

Easy explanation: The pig iron from a blast furnace contains 3.5%–5.0% carbon.  Carbon is the most important alloying element for steel and affects the strength of cans. Carbon in higher concentration, when combined with manganese results in higher steel strength.