Question

The final stage of thickness reduction is carried out by ________

(a) roll pressing

(b) screw pressing

(c) hot rolling

(d) cold rolling

I got this question in an interview for internship.

The origin of the question is Manufacture of Tinplate in division Metal Packaging Materials of Food Packaging Technology

Answer 1

Right choice is (d) cold rolling

The best explanation: The final stage of thickness reduction (typically 90% from about 2 mm to <0.2 mm) is carried out by cold rolling. The effects of cold rolling are to increase the strength and hardness of the steel, but this is done at the expense of ductility.