Question

What is the minimum percent of chromium is needed to make stainless steel?

(a) 2%

(b) 20%

(c) 1%

(d) 11%

This question was posed to me during an interview.

This is a very interesting question from Eight Forms in section Eight Forms of Corrosion of Corrosion Engineering

Answer 1

The correct option is (d) 11%

For explanation I would say: Stainless steel is a family of iron-based alloys that contain a minimum of 11% chromium. Chromium imparts corrosive resistance to steel. There are 4 types of stainless steel.

They are i. Austenitic stainless steels

ii. Martensitic stainless steels

iii. Ferritic stainless steels

iv. Duplex stainless steels