Question

The sulphur content in acid-cupola operation does not depend on which of the following factors?

(a) Quantity of coke

(b) Slag basicity

(c) Tensile strength of the steel

(d) Quantity of steel

The question was asked during an interview.

This intriguing question comes from Cupola Charge Calculations in portion Metal Furnace and Practice of Casting-Forming-Welding II

Answer 1

Correct answer is (c) Tensile strength of the steel

To elaborate: In the acid-cupola reaction, the sulphur content is always increased. This increase in the sulphur content depends on quantity of coke, quantity of steel, the slag basicity, but not the tensile strength of steel.