Question

Sulphide shape control in steel making is done by adding:

• A. Copper
• B. Argon
• C. Zinc
• D. Nickel

Hint:

Sulphide inclusions are controlled using \textbf{argon gas stirring}, which modifies their shape and improves steel toughness.

Answer 1

The Correct Option is B

Step 1: What is Sulphide Shape Control?
In steelmaking, sulphide inclusions (primarily MnS) can adversely affect the mechanical properties of steel, especially ductility and toughness. Sulphide shape control involves modifying the shape of these inclusions from elongated (detrimental) to globular (harmless). Step 2: Role of Argon in Shape Control
Argon gas stirring is used during secondary steelmaking to homogenize temperature and composition. It plays a critical role in: - Modifying sulphide morphology, - Promoting inclusion flotation and removal, - Ensuring cleaner and tougher steel. Step 3: Evaluating Other Options
- Copper, Zinc, and Nickel are alloying elements but do not contribute to sulphide shape control. - Argon is chemically inert but physically effective due to its agitation and stirring effect. Conclusion: Sulphide shape control in steelmaking is achieved by the addition of argon gas during secondary refining.