Question

What is the permissible percentage of Sulphur and Phosphorous content in steel?

(a) 0.1%, 0.12%

(b) 1.0%, 3.0%

(c) 3.0%, 1.0%

(d) 1.0%, 1.0%

The question was asked in class test.

This intriguing question originated from Properties of Steel in chapter Materials, Structures and Specifications of Design of Steel Structures

Answer 1

Right answer is (a) 0.1%, 0.12%

To explain: Sulphur content is generally between 0.02 – 0.1%. If more than 0.1%, it decreases strength and ductility of steel. If Phosphorous is more than 0.12%, it reduces shock resistance, ductility and strength of steel.